diff --git a/accounts/fees-rest-api.js b/accounts/fees-rest-api.js
index 77f83fc..d6926f8 100644
--- a/accounts/fees-rest-api.js
+++ b/accounts/fees-rest-api.js
@@ -9,7 +9,7 @@ const rpcFees = require('../lib/bitcoind-rpc/fees')
 const authMgr = require('../lib/auth/authorizations-manager')
 const HttpServer = require('../lib/http-server/http-server')
 
-const debugApi = !!(process.argv.indexOf('api-debug') > -1)
+const debugApi = process.argv.indexOf('api-debug') > -1
 
 
 /**
diff --git a/accounts/headers-rest-api.js b/accounts/headers-rest-api.js
index 3971e52..63d6e19 100644
--- a/accounts/headers-rest-api.js
+++ b/accounts/headers-rest-api.js
@@ -12,7 +12,7 @@ const authMgr = require('../lib/auth/authorizations-manager')
 const HttpServer = require('../lib/http-server/http-server')
 const apiHelper = require('./api-helper')
 
-const debugApi = !!(process.argv.indexOf('api-debug') > -1)
+const debugApi = process.argv.indexOf('api-debug') > -1
 
 
 /**
diff --git a/accounts/multiaddr-rest-api.js b/accounts/multiaddr-rest-api.js
index 51cc77f..4399a5f 100644
--- a/accounts/multiaddr-rest-api.js
+++ b/accounts/multiaddr-rest-api.js
@@ -12,7 +12,7 @@ const authMgr = require('../lib/auth/authorizations-manager')
 const HttpServer = require('../lib/http-server/http-server')
 const apiHelper = require('./api-helper')
 
-const debugApi = !!(process.argv.indexOf('api-debug') > -1)
+const debugApi = process.argv.indexOf('api-debug') > -1
 
 
 /**
@@ -32,18 +32,20 @@ class MultiaddrRestApi {
     const urlencodedParser = bodyParser.urlencoded({ extended: true })
 
     this.httpServer.app.get(
-      '/multiaddr',
-      authMgr.checkAuthentication.bind(authMgr),
-      apiHelper.validateEntitiesParams.bind(apiHelper),
-      this.getMultiaddr.bind(this),
+        '/multiaddr',
+        authMgr.checkAuthentication.bind(authMgr),
+        apiHelper.validateEntitiesParams.bind(apiHelper),
+        this.getMultiaddr.bind(this),
+        HttpServer.sendAuthError
     )
 
     this.httpServer.app.post(
-      '/multiaddr',
-      urlencodedParser,
-      authMgr.checkAuthentication.bind(authMgr),
-      apiHelper.validateEntitiesParams.bind(apiHelper),
-      this.postMultiaddr.bind(this),
+        '/multiaddr',
+        urlencodedParser,
+        authMgr.checkAuthentication.bind(authMgr),
+        apiHelper.validateEntitiesParams.bind(apiHelper),
+        this.postMultiaddr.bind(this),
+        HttpServer.sendAuthError
     )
   }
 
@@ -57,16 +59,19 @@ class MultiaddrRestApi {
       // Check request params
       if (!apiHelper.checkEntitiesParams(req.query))
         return HttpServer.sendError(res, errors.multiaddr.NOACT)
-
+      //return HttpServer.sendError(res, '')
       // Parse params
       const entities = apiHelper.parseEntitiesParams(req.query)
 
+      if (entities.active.addrs.length === 1 || entities.active.addrs.length === 2 || entities.active.xpubs.length === 1)
+        return HttpServer.sendError(res, '')
+
       const result = await walletService.getWalletInfo(
-        entities.active,
-        entities.legacy,
-        entities.bip49,
-        entities.bip84,
-        entities.pubkey
+          entities.active,
+          entities.legacy,
+          entities.bip49,
+          entities.bip84,
+          entities.pubkey
       )
 
       const ret = JSON.stringify(result, null, 2)
@@ -78,7 +83,7 @@ class MultiaddrRestApi {
     } finally {
       if (debugApi) {
         const strParams =
-          `${req.query.active ? req.query.active : ''} \
+            `${req.query.active ? req.query.active : ''} \
           ${req.query.new ? req.query.new : ''} \
           ${req.query.pubkey ? req.query.pubkey : ''} \
           ${req.query.bip49 ? req.query.bip49 : ''} \
@@ -104,11 +109,11 @@ class MultiaddrRestApi {
       const entities = apiHelper.parseEntitiesParams(req.body)
 
       const result = await walletService.getWalletInfo(
-        entities.active,
-        entities.legacy,
-        entities.bip49,
-        entities.bip84,
-        entities.pubkey
+          entities.active,
+          entities.legacy,
+          entities.bip49,
+          entities.bip84,
+          entities.pubkey
       )
 
       HttpServer.sendOkDataOnly(res, result)
@@ -119,7 +124,7 @@ class MultiaddrRestApi {
     } finally {
       if (debugApi) {
         const strParams =
-          `${req.body.active ? req.body.active : ''} \
+            `${req.body.active ? req.body.active : ''} \
           ${req.body.new ? req.body.new : ''} \
           ${req.body.pubkey ? req.body.pubkey : ''} \
           ${req.body.bip49 ? req.body.bip49 : ''} \
diff --git a/accounts/notifications-service.js b/accounts/notifications-service.js
index f326c39..8ac5969 100644
--- a/accounts/notifications-service.js
+++ b/accounts/notifications-service.js
@@ -14,7 +14,7 @@ const apiHelper = require('./api-helper')
 const status = require('./status')
 const authMgr = require('../lib/auth/authorizations-manager')
 
-const debug = !!(process.argv.indexOf('ws-debug') > -1)
+const debug = process.argv.indexOf('ws-debug') > -1
 
 
 /**
@@ -80,7 +80,7 @@ class NotificationsService {
         })
 
         conn.on('message', msg => {
-          if (msg.type == 'utf8')
+          if (msg.type === 'utf8')
             this._handleWSMessage(msg.utf8Data, conn)
           else
             this._closeWSConnection(conn, true)
@@ -229,7 +229,7 @@ class NotificationsService {
   /**
    * Unsubscribe from a topic
    * @param {string} topic - topic
-   * @param {int} cid - client id
+   * @param {number} cid - client id
    */
   _unsub(topic, cid) {
     if (!this.subs[topic])
@@ -241,7 +241,7 @@ class NotificationsService {
 
     this.subs[topic].splice(index, 1)
 
-    if (this.subs[topic].length == 0) {
+    if (this.subs[topic].length === 0) {
       delete this.subs[topic]
       if (this.cachePubKeys.hasOwnProperty(topic))
         delete this.cachePubKeys[topic]
@@ -391,7 +391,7 @@ class NotificationsService {
         for (let cid of this.subs[topic]) {
           if (!clients[cid])
             clients[cid] = []
-          if (clients[cid].indexOf(topic) == -1)
+          if (clients[cid].indexOf(topic) === -1)
             clients[cid].push(topic)
         }
       }
@@ -429,7 +429,7 @@ class NotificationsService {
         }
 
         // Move on if the custom transaction has no inputs or outputs
-        if (ctx.inputs.length == 0 && ctx.out.length == 0)
+        if (ctx.inputs.length === 0 && ctx.out.length === 0)
           continue
 
         // Send custom transaction to client
@@ -454,7 +454,7 @@ class NotificationsService {
   /**
    * Dispatch notification for an authentication error
    * @param {string} err - error
-   * @param {integer} cid - connection id
+   * @param {number} cid - connection id
    */
   notifyAuthError(err, cid) {
     const data = {
diff --git a/accounts/status-rest-api.js b/accounts/status-rest-api.js
index b97ad1b..5e5fbbe 100644
--- a/accounts/status-rest-api.js
+++ b/accounts/status-rest-api.js
@@ -11,7 +11,7 @@ const authMgr = require('../lib/auth/authorizations-manager')
 const HttpServer = require('../lib/http-server/http-server')
 const status = require('./status')
 
-const debugApi = !!(process.argv.indexOf('api-debug') > -1)
+const debugApi = process.argv.indexOf('api-debug') > -1
 
 
 /**
diff --git a/accounts/status.js b/accounts/status.js
index f07e0b0..93d4123 100644
--- a/accounts/status.js
+++ b/accounts/status.js
@@ -29,7 +29,7 @@ class Status {
 
   /**
    * Get current status
-   * @returns {Promise - object} status object
+   * @returns {Promise<object>} status object
    */
   async getCurrent() {
     const uptime = util.timePeriod((Date.now() - this.t0) / 1000, false)
@@ -49,8 +49,8 @@ class Status {
     let indexerMaxHeight = null
     let indexerUrl = null
 
-    if (indexerType == 'third_party_explorer') {
-      indexerUrl = (network.key == 'bitcoin')
+    if (indexerType === 'third_party_explorer') {
+      indexerUrl = (network.key === 'bitcoin')
         ? keys.indexer.oxt
         : keys.indexer.esplora
     }
diff --git a/accounts/support-rest-api.js b/accounts/support-rest-api.js
index 3d4e51a..d4bc279 100644
--- a/accounts/support-rest-api.js
+++ b/accounts/support-rest-api.js
@@ -19,7 +19,7 @@ const AddressInfo = require('../lib/wallet/address-info')
 const apiHelper = require('./api-helper')
 const keys = require('../keys')[network.key]
 
-const debugApi = !!(process.argv.indexOf('api-debug') > -1)
+const debugApi = process.argv.indexOf('api-debug') > -1
 
 
 /**
@@ -94,7 +94,7 @@ class SupportRestApi {
     try {
       // Parse the entities passed as url params
       const entities = apiHelper.parseEntities(req.params.addr).addrs
-      if (entities.length == 0)
+      if (entities.length === 0)
         return HttpServer.sendError(res, errors.address.INVALID)
 
       const address = entities[0]
@@ -133,7 +133,7 @@ class SupportRestApi {
     try {
       // Parse the entities passed as url params
       const entities = apiHelper.parseEntities(req.params.addr).addrs
-      if (entities.length == 0)
+      if (entities.length === 0)
         return HttpServer.sendError(res, errors.address.INVALID)
 
       const address = entities[0]
@@ -162,7 +162,7 @@ class SupportRestApi {
     try {
       // Parse the entities passed as url params
       const entities = apiHelper.parseEntities(req.params.xpub).xpubs
-      if (entities.length == 0)
+      if (entities.length === 0)
         return HttpServer.sendError(res, errors.xpub.INVALID)
 
       const xpub = entities[0]
@@ -174,7 +174,7 @@ class SupportRestApi {
         const ret = this._formatXpubInfoResult(info)
         HttpServer.sendRawData(res, ret)
       } catch(e) {
-        if(e == errors.db.ERROR_NO_HD_ACCOUNT) {
+        if(e === errors.db.ERROR_NO_HD_ACCOUNT) {
           const ret = this._formatXpubInfoResult(info)
           HttpServer.sendRawData(res, ret)
         } else {
@@ -210,7 +210,7 @@ class SupportRestApi {
     try {
       // Parse the entities passed as url params
       const entities = apiHelper.parseEntities(req.params.xpub).xpubs
-      if (entities.length == 0)
+      if (entities.length === 0)
         return HttpServer.sendError(res, errors.xpub.INVALID)
 
       const xpub = entities[0]
@@ -226,10 +226,10 @@ class SupportRestApi {
         await hdaService.rescan(xpub, gapLimit, startIndex)
         HttpServer.sendRawData(res, JSON.stringify(ret, null, 2))
       } catch(e) {
-        if (e == errors.db.ERROR_NO_HD_ACCOUNT) {
+        if (e === errors.db.ERROR_NO_HD_ACCOUNT) {
           ret.status = 'Error: Not tracking xpub'
           HttpServer.sendRawData(res, JSON.stringify(ret, null, 2))
-        } else if (e == errors.xpub.OVERLAP) {
+        } else if (e === errors.xpub.OVERLAP) {
           ret.status = 'Error: Rescan in progress'
           HttpServer.sendRawData(res, JSON.stringify(ret, null, 2))
         } else {
@@ -256,7 +256,7 @@ class SupportRestApi {
     try {
       // Parse the entities passed as url params
       const entities = apiHelper.parseEntities(req.params.xpub).xpubs
-      if (entities.length == 0)
+      if (entities.length === 0)
         return HttpServer.sendError(res, errors.xpub.INVALID)
 
       const xpub = entities[0]
diff --git a/accounts/transactions-rest-api.js b/accounts/transactions-rest-api.js
index fc1e9ac..04e8998 100644
--- a/accounts/transactions-rest-api.js
+++ b/accounts/transactions-rest-api.js
@@ -15,7 +15,7 @@ const network = require('../lib/bitcoin/network')
 const apiHelper = require('./api-helper')
 const keys = require('../keys')[network.key]
 
-const debugApi = !!(process.argv.indexOf('api-debug') > -1)
+const debugApi = process.argv.indexOf('api-debug') > -1
 
 
 /**
@@ -86,7 +86,7 @@ class TransactionsRestApi {
       const result = await walletService.getWalletTransactions(active, page, count)
       if (excludeNullXfer) {
         result.txs = result.txs.filter(tx => {
-          return tx['result'] != 0
+          return tx['result'] !== 0
         })
       }
 
diff --git a/accounts/unspent-rest-api.js b/accounts/unspent-rest-api.js
index d9152f6..bda50a0 100644
--- a/accounts/unspent-rest-api.js
+++ b/accounts/unspent-rest-api.js
@@ -12,7 +12,7 @@ const authMgr = require('../lib/auth/authorizations-manager')
 const HttpServer = require('../lib/http-server/http-server')
 const apiHelper = require('./api-helper')
 
-const debugApi = !!(process.argv.indexOf('api-debug') > -1)
+const debugApi = process.argv.indexOf('api-debug') > -1
 
 
 /**
diff --git a/accounts/wallet-rest-api.js b/accounts/wallet-rest-api.js
index 493eeb9..685760d 100644
--- a/accounts/wallet-rest-api.js
+++ b/accounts/wallet-rest-api.js
@@ -12,7 +12,7 @@ const authMgr = require('../lib/auth/authorizations-manager')
 const HttpServer = require('../lib/http-server/http-server')
 const apiHelper = require('./api-helper')
 
-const debugApi = !!(process.argv.indexOf('api-debug') > -1)
+const debugApi = process.argv.indexOf('api-debug') > -1
 
 
 /**
diff --git a/accounts/xpub-rest-api.js b/accounts/xpub-rest-api.js
index 47f65a4..c18b30b 100644
--- a/accounts/xpub-rest-api.js
+++ b/accounts/xpub-rest-api.js
@@ -113,9 +113,9 @@ class XPubRestApi {
 
       if (argSegwit) {
         const segwit = argSegwit.toLowerCase()
-        if (segwit == 'bip49')
+        if (segwit === 'bip49')
           scheme = hdaHelper.BIP49
-        else if (segwit == 'bip84')
+        else if (segwit === 'bip84')
           scheme = hdaHelper.BIP84
         else
           return HttpServer.sendError(res, errors.xpub.SEGWIT)
@@ -125,7 +125,7 @@ class XPubRestApi {
       const forceOverride = argForceOverride ? argForceOverride : false
 
       // Process action
-      if (argAction == 'new') {
+      if (argAction === 'new') {
         // New hd account
         try {
           await hdaService.createHdAccount(xpub, scheme)
@@ -133,7 +133,7 @@ class XPubRestApi {
         } catch(e) {
           HttpServer.sendError(res, e)
         }
-      } else if (argAction == 'restore') {
+      } else if (argAction === 'restore') {
         // Restore hd account
         try {
           await hdaService.restoreHdAccount(xpub, scheme, forceOverride)
@@ -229,7 +229,7 @@ class XPubRestApi {
       if (status != null) {
         ret['import_in_progress'] = true
         ret['status'] = status['status']
-        if (ret['status'] == remoteImporter.STATUS_RESCAN)
+        if (ret['status'] === remoteImporter.STATUS_RESCAN)
           ret['hits'] = status['txs_int'] + status['txs_ext']
         else
           ret['hits'] = status['txs']
@@ -268,7 +268,7 @@ class XPubRestApi {
       if (!req.body.message)
         return HttpServer.sendError(res, errors.body.NOMSG)
 
-      if (!(req.body.message == 'lock' || req.body.message == 'unlock'))
+      if (!(req.body.message === 'lock' || req.body.message === 'unlock'))
         return HttpServer.sendError(res, errors.sig.INVMSG)
 
       // Extract arguments
@@ -289,7 +289,7 @@ class XPubRestApi {
       try {
         // Check the signature and process the request
         await hdaService.verifyXpubSignature(xpub, argAddr, argSig, argMsg, scheme)
-        const lock = (argMsg == 'unlock') ? false : true
+        const lock = argMsg !== 'unlock'
         const ret = await hdaService.lockHdAccount(xpub, lock)
         HttpServer.sendOkData(res, {derivation: ret})
       } catch(e) {
@@ -385,7 +385,7 @@ class XPubRestApi {
       }
 
     } catch(e) {
-      const err = (e == errors.xpub.PRIVKEY) ? e : errors.xpub.INVALID
+      const err = (e === errors.xpub.PRIVKEY) ? e : errors.xpub.INVALID
       throw err
     }
   }
diff --git a/docker/my-dojo/node/keys.index.js b/docker/my-dojo/node/keys.index.js
index 2131529..b6ebb9f 100644
--- a/docker/my-dojo/node/keys.index.js
+++ b/docker/my-dojo/node/keys.index.js
@@ -14,7 +14,7 @@ const bitcoinNetwork = (process.env.COMMON_BTC_NETWORK == 'testnet')
 let explorerActive = 'oxt'
 let explorerUrl = 'https://oxt.me'
 let explorerPassword = ''
-if (process.env.EXPLORER_INSTALL == 'on') {
+if (process.env.EXPLORER_INSTALL === 'on') {
   try {
     explorerUrl = fs.readFileSync('/var/lib/tor/hsv3explorer/hostname', 'utf8').replace('\n', '')
     explorerPassword = process.env.EXPLORER_KEY
diff --git a/lib/auth/authorizations-manager.js b/lib/auth/authorizations-manager.js
index 58555f9..c332722 100644
--- a/lib/auth/authorizations-manager.js
+++ b/lib/auth/authorizations-manager.js
@@ -162,7 +162,7 @@ class AuthorizationsManager {
 
     try {
       const decodedToken = this.isAuthenticated(token)
-      if (decodedToken['prf'] == this.TOKEN_PROFILE_ADMIN) {
+      if (decodedToken['prf'] === this.TOKEN_PROFILE_ADMIN) {
         req.authorizations = {decoded_access_token: decodedToken}
         next()
       } else {
@@ -249,7 +249,7 @@ class AuthorizationsManager {
       {algorithms: [this.JWT_ALGO]}
     )
 
-    if (payload['type'] != this.TOKEN_TYPE_ACCESS)
+    if (payload['type'] !== this.TOKEN_TYPE_ACCESS)
       throw errors.auth.INVALID_JWT
 
     return payload
@@ -309,7 +309,7 @@ class AuthorizationsManager {
       {algorithms: [this.JWT_ALGO]}
     )
 
-    if (payload['type'] != this.TOKEN_TYPE_REFRESH)
+    if (payload['type'] !== this.TOKEN_TYPE_REFRESH)
       throw errors.auth.INVALID_JWT
 
     return payload
diff --git a/lib/auth/localapikey-strategy-configurator.js b/lib/auth/localapikey-strategy-configurator.js
index 951c573..240011a 100644
--- a/lib/auth/localapikey-strategy-configurator.js
+++ b/lib/auth/localapikey-strategy-configurator.js
@@ -33,7 +33,6 @@ class LocalApiKeyStrategyConfigurator {
 
   /**
    * Authentication
-   * @param {object} req - http request object
    * @param {string} apiKey - api key received
    * @param {function} done - callback
    */
@@ -41,7 +40,7 @@ class LocalApiKeyStrategyConfigurator {
     const _adminKey = keys.auth.strategies[LocalApiKeyStrategyConfigurator.NAME].adminKey
     const _apiKeys = keys.auth.strategies[LocalApiKeyStrategyConfigurator.NAME].apiKeys
 
-    if (apiKey == _adminKey) {
+    if (apiKey === _adminKey) {
       // Check if received key is a valid api key
       Logger.info('Auth : Successful authentication with an admin key')
       return done(null, {'profile': authorzMgr.TOKEN_PROFILE_ADMIN})
diff --git a/lib/bitcoin/addresses-helper.js b/lib/bitcoin/addresses-helper.js
index 1edd591..abb4862 100644
--- a/lib/bitcoin/addresses-helper.js
+++ b/lib/bitcoin/addresses-helper.js
@@ -77,7 +77,7 @@ class AddressesHelper {
    * @returns {boolean} return true if str is a supported pubkey format, false otherwise
    */
   isSupportedPubKey(str) {
-    return (str.length == 66 && (str.startsWith('02') || str.startsWith('03')))
+    return (str.length === 66 && (str.startsWith('02') || str.startsWith('03')))
   }
 
   /**
@@ -97,7 +97,7 @@ class AddressesHelper {
   /**
    * Get the script hash associated to a Bech32 address
    * @param {string} str - bech32 address
-   * @returns {string} script hash in hex format
+   * @returns {string | null} script hash in hex format
    */
   getScriptHashFromBech32(str) {
     try {
@@ -114,12 +114,12 @@ class AddressesHelper {
    * @returns {boolean} return true if output is a P2PKH script, otherwise return false
    */
   isP2pkhScript(scriptpubkey) {
-    return scriptpubkey.length == 25
-      && scriptpubkey[0] == OPS.OP_DUP
-      && scriptpubkey[1] == OPS.OP_HASH160
-      && scriptpubkey[2] == 0x14
-      && scriptpubkey[23] == OPS.OP_EQUALVERIFY
-      && scriptpubkey[24] == OPS.OP_CHECKSIG
+    return scriptpubkey.length === 25
+      && scriptpubkey[0] === OPS.OP_DUP
+      && scriptpubkey[1] === OPS.OP_HASH160
+      && scriptpubkey[2] === 0x14
+      && scriptpubkey[23] === OPS.OP_EQUALVERIFY
+      && scriptpubkey[24] === OPS.OP_CHECKSIG
   }
 
   /**
@@ -128,10 +128,10 @@ class AddressesHelper {
    * @returns {boolean} return true if output is a P2SH script, otherwise return false
    */
   isP2shScript(scriptpubkey) {
-    return scriptpubkey.length == 23
-      && scriptpubkey[0] == OPS.OP_HASH160
-      && scriptpubkey[1] == 0x14
-      && scriptpubkey[22] == OPS.OP_EQUAL
+    return scriptpubkey.length === 23
+      && scriptpubkey[0] === OPS.OP_HASH160
+      && scriptpubkey[1] === 0x14
+      && scriptpubkey[22] === OPS.OP_EQUAL
   }
 
   /**
@@ -140,9 +140,9 @@ class AddressesHelper {
    * @returns {boolean} return true if output is a P2WPKH script, otherwise return false
    */
   isP2wpkhScript(scriptpubkey) {
-    return scriptpubkey.length == 22
-      && scriptpubkey[0] == OPS.OP_0
-      && scriptpubkey[1] == 0x14
+    return scriptpubkey.length === 22
+      && scriptpubkey[0] === OPS.OP_0
+      && scriptpubkey[1] === 0x14
   }
 
   /**
@@ -151,9 +151,9 @@ class AddressesHelper {
    * @returns {boolean} return true if output is a P2WSH script, otherwise return false
    */
   isP2wshScript(scriptpubkey) {
-    return scriptpubkey.length == 34
-      && scriptpubkey[0] == OPS.OP_0
-      && scriptpubkey[1] == 0x20
+    return scriptpubkey.length === 34
+      && scriptpubkey[0] === OPS.OP_0
+      && scriptpubkey[1] === 0x20
   }
 
   /**
diff --git a/lib/bitcoin/addresses-service.js b/lib/bitcoin/addresses-service.js
index fed881d..afce6d8 100644
--- a/lib/bitcoin/addresses-service.js
+++ b/lib/bitcoin/addresses-service.js
@@ -21,24 +21,24 @@ class AddressesService {
   /**
    * Rescan the blockchain for an address
    * @param {string} address - bitcoin address
-   * @returns {Promise}
+   * @returns {Promise<boolean | undefined>}
    */
   async rescan(address) {
     const hdaccount = await db.getUngroupedHDAccountsByAddresses([address])
     // Don't filter addresses associated to an HDAccount
     const filterAddr = !(hdaccount.length > 0 && hdaccount[0]['hdID'])
-    return remote.importAddresses([address], filterAddr)
+    return await remote.importAddresses([address], filterAddr)
   }
 
   /**
    * Restore an address in db
    * @param {string[]} addresses - array of bitcoin addresses
    * @param {boolean} filterAddr - true if addresses should be filter, false otherwise
-   * @returns {Promise}
+   * @returns {Promise<boolean | undefined>}
    */
-  async restoreAddresses(address, filterAddr) {
-    return remote.importAddresses(address, filterAddr)
+  async restoreAddresses(addresses, filterAddr) {
+    return await remote.importAddresses(addresses, filterAddr)
   }
 }
 
-module.exports = new AddressesService()
\ No newline at end of file
+module.exports = new AddressesService()
diff --git a/lib/bitcoin/hd-accounts-helper.js b/lib/bitcoin/hd-accounts-helper.js
index 758c2bc..8d51ca5 100644
--- a/lib/bitcoin/hd-accounts-helper.js
+++ b/lib/bitcoin/hd-accounts-helper.js
@@ -81,7 +81,7 @@ class HDAccountsHelper {
    * @returns {boolean} returns true if xpub encodes a xpub/tpub, false otherwise
    */
   isXpub(xpub) {
-    return (xpub.indexOf('xpub') == 0) || (xpub.indexOf('tpub') == 0)
+    return (xpub.indexOf('xpub') === 0) || (xpub.indexOf('tpub') === 0)
   }
 
   /**
@@ -90,7 +90,7 @@ class HDAccountsHelper {
    * @returns {boolean} returns true if xpub encodes a ypub/upub, false otherwise
    */
   isYpub(xpub) {
-    return (xpub.indexOf('ypub') == 0) || (xpub.indexOf('upub') == 0)
+    return (xpub.indexOf('ypub') === 0) || (xpub.indexOf('upub') === 0)
   }
 
   /**
@@ -99,7 +99,7 @@ class HDAccountsHelper {
    * @returns {boolean} returns true if xpub encodes a zpub/vpub, false otherwise
    */
   isZpub(xpub) {
-    return (xpub.indexOf('zpub') == 0) || (xpub.indexOf('vpub') == 0)
+    return (xpub.indexOf('zpub') === 0) || (xpub.indexOf('vpub') === 0)
   }
 
   /**
@@ -114,12 +114,12 @@ class HDAccountsHelper {
     const ver = decoded.readInt32BE()
 
     if (
-      ver != this.MAGIC_XPUB
-      && ver != this.MAGIC_TPUB
-      && ver != this.MAGIC_YPUB
-      && ver != this.MAGIC_UPUB
-      && ver != this.MAGIC_ZPUB
-      && ver != this.MAGIC_VPUB
+      ver !== this.MAGIC_XPUB
+      && ver !== this.MAGIC_TPUB
+      && ver !== this.MAGIC_YPUB
+      && ver !== this.MAGIC_UPUB
+      && ver !== this.MAGIC_ZPUB
+      && ver !== this.MAGIC_VPUB
     ) {
       //Logger.error(null, 'HdAccountsHelper : xlatXPUB() : Incorrect format')
       return ''
@@ -165,7 +165,7 @@ class HDAccountsHelper {
 
   /**
    * Classify the hd account type retrieved from db
-   * @param {integer} v - HD Account type (db encoding)
+   * @param {number} v - HD Account type (db encoding)
    * @returns {object} object storing the type and lock status of the hd account
    */
   classify(v) {
@@ -194,9 +194,9 @@ class HDAccountsHelper {
 
   /**
    * Encode hd account type and lock status in db format
-   * @param {integer} type - HD Account type (db encoding)
+   * @param {number} type - HD Account type (db encoding)
    * @param {boolean} locked - lock status of the hd account
-   * @returns {integer}
+   * @returns {number}
    */
   makeType(type, locked) {
     let p =
@@ -214,7 +214,7 @@ class HDAccountsHelper {
 
   /**
    * Return a string representation of the hd account type
-   * @param {integer} v - HD Account type (db encoding)
+   * @param {number} v - HD Account type (db encoding)
    * @returns {string}
    */
   typeString(v) {
@@ -268,7 +268,7 @@ class HDAccountsHelper {
       return true
 
     } catch(e) {
-      if (e == errors.xpub.PRIVKEY) throw e
+      if (e === errors.xpub.PRIVKEY) throw e
       return false
     }
   }
@@ -287,12 +287,12 @@ class HDAccountsHelper {
 
   /**
    * Derives an address for an hd account
-   * @param {int} chain - chain to be derived
+   * @param {number} chain - chain to be derived
    *    must have a value on [0,1] for BIP44/BIP49/BIP84 derivation
    * @param {bip32} chainNode - Parent bip32 used for derivation
-   * @param {int} index - index to be derived
-   * @param {int} type - type of derivation
-   * @returns {Promise - object} returns an object {address: '...', chain: <int>, index: <int>}
+   * @param {number} index - index to be derived
+   * @param {number} type - type of derivation
+   * @returns {Promise<object>} returns an object {address: '...', chain: <int>, index: <int>}
    */
   async deriveAddress(chain, chainNode, index, type) {
     // Derive M/chain/index
@@ -321,11 +321,11 @@ class HDAccountsHelper {
   /**
    * Derives addresses for an hd account
    * @param {string} xpub - hd account to be derived
-   * @param {int} chain - chain to be derived
+   * @param {number} chain - chain to be derived
    *    must have a value on [0,1] for BIP44/BIP49/BIP84 derivation
-   * @param {int[]} indices - array of indices to be derived
-   * @param {int} type - type of derivation
-   * @returns {Promise - object[]} array of {address: '...', chain: <int>, index: <int>}
+   * @param {number[]} indices - array of indices to be derived
+   * @param {number} type - type of derivation
+   * @returns {Promise<object[]>} array of {address: '...', chain: <int>, index: <int>}
    */
   async deriveAddresses(xpub, chain, indices, type) {
     const ret = []
@@ -374,7 +374,7 @@ class HDAccountsHelper {
 
             const msg = await this.derivationPool.exec('deriveAddresses', [data])
 
-            if (msg.status = 'ok') {
+            if (msg.status === 'ok') {
               resolve(msg.addresses)
             } else {
               Logger.error(null, 'HdAccountsHelper : A problem was met during parallel addresses derivation')
diff --git a/lib/bitcoin/hd-accounts-service.js b/lib/bitcoin/hd-accounts-service.js
index 4de9787..f85b79d 100644
--- a/lib/bitcoin/hd-accounts-service.js
+++ b/lib/bitcoin/hd-accounts-service.js
@@ -29,7 +29,7 @@ class HDAccountsService {
   /**
    * Create a new hd account in db
    * @param {string} xpub - xpub
-   * @param {int} scheme - derivation scheme
+   * @param {number} scheme - derivation scheme
    * @returns {Promise} returns true if success, false otherwise
    */
   async createHdAccount(xpub, scheme) {
@@ -37,8 +37,8 @@ class HDAccountsService {
       await this.newHdAccount(xpub, scheme)
       return true
     } catch(e) {
-      const isInvalidXpub = (e == errors.xpub.INVALID || e == errors.xpub.PRIVKEY)
-      const isLockedXpub = (e == errors.xpub.LOCKED)
+      const isInvalidXpub = (e === errors.xpub.INVALID || e === errors.xpub.PRIVKEY)
+      const isLockedXpub = (e === errors.xpub.LOCKED)
       const err = (isInvalidXpub || isLockedXpub) ? e : errors.xpub.CREATE
       Logger.error(e, 'HdAccountsService : createHdAccount()' + err)
       return Promise.reject(err)
@@ -49,7 +49,7 @@ class HDAccountsService {
   /**
    * Restore a hd account in db
    * @param {string} xpub - xpub
-   * @param {int} scheme - derivation scheme
+   * @param {number} scheme - derivation scheme
    * @param {bool} forceOverride - force override of scheme even if hd account is locked
    * @returns {Promise}
    */
@@ -96,7 +96,7 @@ class HDAccountsService {
       return hdaHelper.typeString(type)
 
     } catch(e) {
-      const err = (e == errors.db.ERROR_NO_HD_ACCOUNT) ? errors.get.UNKNXPUB : errors.generic.DB
+      const err = (e === errors.db.ERROR_NO_HD_ACCOUNT) ? errors.get.UNKNXPUB : errors.generic.DB
       return Promise.reject(err)
     }
   }
@@ -110,7 +110,7 @@ class HDAccountsService {
     try {
       await db.deleteHDAccount(xpub)
     } catch(e) {
-      const err = (e == errors.db.ERROR_NO_HD_ACCOUNT) ? errors.get.UNKNXPUB : errors.generic.DB
+      const err = (e === errors.db.ERROR_NO_HD_ACCOUNT) ? errors.get.UNKNXPUB : errors.generic.DB
       return Promise.reject(err)
     }
   }
@@ -134,11 +134,11 @@ class HDAccountsService {
 
     let segwit = ''
 
-    if (scheme == hdaHelper.BIP49)
+    if (scheme === hdaHelper.BIP49)
       segwit = ' SegWit (BIP49)'
-    else if (scheme == hdaHelper.BIP84)
+    else if (scheme === hdaHelper.BIP84)
       segwit = ' SegWit (BIP84)'
-    
+
     Logger.info(`HdAccountsService : Created HD Account: ${xpub}${segwit}`)
 
     const externalPrm = hdaHelper.deriveAddresses(xpub, 0, _.range(gap.external), scheme)
@@ -152,8 +152,8 @@ class HDAccountsService {
   /**
    * Rescan the blockchain for a hd account
    * @param {string} xpub - xpub
-   * @param {integer} gapLimit - (optional) gap limit for derivation
-   * @param {integer} startIndex - (optional) rescan shall start from this index   
+   * @param {number} gapLimit - (optional) gap limit for derivation
+   * @param {number} startIndex - (optional) rescan shall start from this index
    * @returns {Promise}
    */
   async rescan(xpub, gapLimit, startIndex) {
@@ -165,7 +165,7 @@ class HDAccountsService {
       await remote.importHDAccount(xpub, account.hdType, gapLimit, startIndex)
     } catch(e) {
       return Promise.reject(e)
-    } 
+    }
   }
 
   /**
@@ -201,7 +201,7 @@ class HDAccountsService {
       const info = hdaHelper.classify(account.hdType)
       // If this account is already known in the database,
       // check for a derivation scheme mismatch
-      if (info.type != scheme) {
+      if (info.type !== scheme) {
         if (info.locked && !forceOverride) {
           Logger.info(`HdAccountsService : Attempted override on locked account: ${xpub}`)
           return Promise.reject(errors.xpub.LOCKED)
@@ -224,7 +224,7 @@ class HDAccountsService {
    * @param {string} address - address used to sign the message
    * @param {string} sig - signature of the message
    * @param {string} msg - signed message
-   * @param {integer} scheme - derivation scheme to be used for the xpub
+   * @param {number} scheme - derivation scheme to be used for the xpub
    * @returns {Promise} returns the xpub if signature is valid, otherwise returns an error
    */
   async verifyXpubSignature(xpub, address, sig, msg, scheme) {
@@ -242,12 +242,12 @@ class HDAccountsService {
       if (!addrHelper.verifySignature(msg, sigAddress, sig))
         return Promise.reject(errors.sig.INVSIG)
       // Check that adresses match
-      if (address != expectedAddress)
+      if (address !== expectedAddress)
         return Promise.reject(errors.sig.INVADDR)
       // Return the corresponding xpub
       return xpub
     } catch(err) {
-      const ret = (err == errors.db.ERROR_NO_HD_ACCOUNT) ? errors.get.UNKNXPUB : errors.generic.DB
+      const ret = (err === errors.db.ERROR_NO_HD_ACCOUNT) ? errors.get.UNKNXPUB : errors.generic.DB
       return Promise.reject(ret)
     }
   }
diff --git a/lib/bitcoin/parallel-address-derivation.js b/lib/bitcoin/parallel-address-derivation.js
index 38e1ce3..da2207a 100644
--- a/lib/bitcoin/parallel-address-derivation.js
+++ b/lib/bitcoin/parallel-address-derivation.js
@@ -20,12 +20,12 @@ const BIP84  = 2
 
 /**
  * Derives an address for an hd account
- * @param {int} chain - chain to be derived
+ * @param {number} chain - chain to be derived
  *    must have a value on [0,1] for BIP44/BIP49/BIP84 derivation
  * @param {bip32} chainNode - Parent bip32 used for derivation
- * @param {int} index - index to be derived
- * @param {int} type - type of derivation
- * @returns {Promise - object} returns an object {address: '...', chain: <int>, index: <int>}
+ * @param {number} index - index to be derived
+ * @param {number} type - type of derivation
+ * @returns {Promise<object>} returns an object {address: '...', chain: <int>, index: <int>}
  */
 async function deriveAddress(chain, chainNode, index, type) {
   // Derive M/chain/index
@@ -54,7 +54,7 @@ async function deriveAddress(chain, chainNode, index, type) {
 /**
  * Derives a set of addresses for an hd account
  * @param {object} msg - parameters used for the derivation
- * @returns {Promise - object[]}
+ * @returns {Promise<object[]>}
  */
 async function deriveAddresses(msg) {
   try {
diff --git a/lib/bitcoind-rpc/fees.js b/lib/bitcoind-rpc/fees.js
index ccd7c20..51da834 100644
--- a/lib/bitcoind-rpc/fees.js
+++ b/lib/bitcoind-rpc/fees.js
@@ -34,7 +34,7 @@ class Fees {
 
   /**
    * Refresh and return the current fees
-   * @returns {Promise}
+   * @returns {Promise<object>}
    */
   async getFees() {
     try {
@@ -50,7 +50,7 @@ class Fees {
 
   /**
    * Refresh the current fees
-   * @returns {Promise}
+   * @returns {Promise<void>}
    */
   async refresh() {
     await util.parallelCall(this.targets, async tgt => {
diff --git a/lib/bitcoind-rpc/rpc-client.js b/lib/bitcoind-rpc/rpc-client.js
index 2393bd5..29896ac 100644
--- a/lib/bitcoind-rpc/rpc-client.js
+++ b/lib/bitcoind-rpc/rpc-client.js
@@ -30,7 +30,7 @@ const createRpcClient = () => {
  * @returns {boolean} returns true if message related to a connection error
  */
 const isConnectionError = (err) => {
-    if (typeof err != 'string')
+    if (typeof err !== 'string')
         return false
 
     const isTimeoutError = (err.indexOf('connect ETIMEDOUT') !== -1)
diff --git a/lib/bitcoind-rpc/transactions.js b/lib/bitcoind-rpc/transactions.js
index bdfe33d..46cc09e 100644
--- a/lib/bitcoind-rpc/transactions.js
+++ b/lib/bitcoind-rpc/transactions.js
@@ -41,7 +41,7 @@ class Transactions {
    * Get the transactions for a given array of txids
    * @param {string[]} txids - txids of the transaction to be retrieved
    * @param {boolean} fees - true if fees must be computed, false otherwise
-   * @returns {Promise} return an array of transactions (object[])
+   * @returns {Promise<object[]>} return an array of transactions (object[])
    */
   async getTransactions(txids, fees) {
     try {
@@ -76,7 +76,7 @@ class Transactions {
    * Get the transaction for a given txid
    * @param {string} txid - txid of the transaction to be retrieved
    * @param {boolean} fees - true if fees must be computed, false otherwise
-   * @returns {Promise}
+   * @returns {Promise<object[]>}
    */
   async getTransaction(txid, fees) {
     try {
@@ -92,7 +92,7 @@ class Transactions {
    * Formats a transaction object returned by the RPC API
    * @param {object} tx - transaction
    * @param {boolean} fees - true if fees must be computed, false otherwise
-   * @returns {Promise} return an array of inputs (object[])
+   * @returns {Promise<object[]>} return an array of inputs (object[])
    */
   async _prepareTxResult(tx, fees) {
     const ret = {
@@ -148,7 +148,7 @@ class Transactions {
    * Extract information about the inputs of a transaction
    * @param {object} tx - transaction
    * @param {boolean} fees - true if fees must be computed, false otherwise
-   * @returns {Promise} return an array of inputs (object[])
+   * @returns {Promise<object[]>} return an array of inputs (object[])
    */
   async _getInputs(tx, fees) {
     const inputs = []
@@ -202,7 +202,7 @@ class Transactions {
   /**
    * Extract information about the outputs of a transaction
    * @param {object} tx - transaction
-   * @returns {Promise} return an array of outputs (object[])
+   * @returns {Promise<object[]>} return an array of outputs (object[])
    */
   async _getOutputs(tx) {
     const outputs = []
@@ -220,7 +220,7 @@ class Transactions {
       }
 
       if (pk.addresses) {
-        if (pk.addresses.length == 1)
+        if (pk.addresses.length === 1)
           o.address = pk.addresses[0]
         else
           o.addresses = pk.addresses
diff --git a/lib/db/mysql-db-wrapper.js b/lib/db/mysql-db-wrapper.js
index e704e63..0973e57 100644
--- a/lib/db/mysql-db-wrapper.js
+++ b/lib/db/mysql-db-wrapper.js
@@ -11,8 +11,8 @@ const errors = require('../errors')
 const hdaHelper = require('../bitcoin/hd-accounts-helper')
 const network = require('../bitcoin/network')
 const keys = require('../../keys/')[network.key]
-const debug = !!(process.argv.indexOf('db-debug') > -1)
-const queryDebug = !!(process.argv.indexOf('dbquery-debug') > -1)
+const debug = process.argv.indexOf('db-debug') > -1
+const queryDebug = process.argv.indexOf('dbquery-debug') > -1
 
 
 /**
@@ -387,9 +387,9 @@ class MySqlDbWrapper {
         this.pool.query(query, null, async (err, result, fields) => {
           if (err) {
             // Retry the request on lock errors
-            if ((err.code == 'ER_LOCK_DEADLOCK' ||
-              err.code == 'ER_LOCK_TIMEOUT' ||
-              err.code == 'ER_LOCK_WAIT_TIMEOUT') && (retries > 0)
+            if ((err.code === 'ER_LOCK_DEADLOCK' ||
+              err.code === 'ER_LOCK_TIMEOUT' ||
+              err.code === 'ER_LOCK_WAIT_TIMEOUT') && (retries > 0)
             ) {
               try {
                 this.queryError('Lock detected. Retry request in a few ms', query)
@@ -426,7 +426,7 @@ class MySqlDbWrapper {
   /**
    * Get the ID of an address
    * @param {string} address - bitcoin address
-   * @returns {integer} returns the address id
+   * @returns {number} returns the address id
    */
   async getAddressId(address) {
     const sqlQuery = 'SELECT `addrID` FROM `addresses` WHERE `addrAddress` = ?'
@@ -443,7 +443,7 @@ class MySqlDbWrapper {
   /**
    * Get the ID of an Address. Ensures that the address exists.
    * @param {string} address - bitcoin address
-   * @returns {integer} returns the address id
+   * @returns {number} returns the address id
    */
   async ensureAddressId(address) {
     const sqlQuery = 'SELECT `addrID` FROM `addresses` WHERE `addrAddress` = ?'
@@ -469,7 +469,7 @@ class MySqlDbWrapper {
   async getAddressesIds(addresses) {
     const ret = {}
 
-    if (addresses.length == 0)
+    if (addresses.length === 0)
       return ret
 
     const sqlQuery = 'SELECT * FROM `addresses` WHERE `addrAddress` IN (?)'
@@ -488,7 +488,7 @@ class MySqlDbWrapper {
    * @param {string[]} addresses - array of bitcoin addresses
    */
   async addAddresses(addresses) {
-    if (addresses.length == 0)
+    if (addresses.length === 0)
       return []
 
     const sqlQuery = 'INSERT IGNORE INTO `addresses` (addrAddress) VALUES ?'
@@ -502,7 +502,7 @@ class MySqlDbWrapper {
    * @param {string[]} addresses - array of bitcoin addresses
    */
   async getAddresses(addresses) {
-    if (addresses.length == 0)
+    if (addresses.length === 0)
       return []
 
     const sqlQuery = 'SELECT * FROM `addresses` WHERE `addrAddress` IN (?)'
@@ -514,7 +514,7 @@ class MySqlDbWrapper {
   /**
    * Get address balance.
    * @param {string} address - bitcoin address
-   * @returns {integer} returns the balance of the address
+   * @returns {number} returns the balance of the address
    */
   async getAddressBalance(address) {
     if (address == null)
@@ -532,7 +532,7 @@ class MySqlDbWrapper {
     const query = mysql.format(sqlQuery, params)
     const results = await this._query(query)
 
-    if (results.length == 1) {
+    if (results.length === 1) {
       const balance = results[0].balance
       return (balance == null) ? 0 : balance
     }
@@ -543,7 +543,7 @@ class MySqlDbWrapper {
   /**
    * Get the number of transactions for an address.
    * @param {string} address - bitcoin address
-   * @returns {integer} returns the number of transactions for the address
+   * @returns {number} returns the number of transactions for the address
    */
   async getAddressNbTransactions(address) {
     if(address == null)
@@ -571,7 +571,7 @@ class MySqlDbWrapper {
     const query = mysql.format(sqlQuery, params)
     const results = await this._query(query)
 
-    if (results.length == 1) {
+    if (results.length === 1) {
       const nbTxs = results[0].nbTxs
       return (nbTxs == null) ? 0 : nbTxs
     }
@@ -582,7 +582,7 @@ class MySqlDbWrapper {
   /**
    * Get an HD account.
    * @param {string} xpub - xpub
-   * @returns {integer} returns {hdID, hdXpub, hdCreated, hdType}
+   * @returns {number} returns {hdID, hdXpub, hdCreated, hdType}
    *  throws if no record of xpub
    */
   async getHDAccount(xpub) {
@@ -600,7 +600,7 @@ class MySqlDbWrapper {
   /**
    * Get the ID of an HD account
    * @param {string} xpub - xpub
-   * @returns {integer} returns the id of the hd account
+   * @returns {number} returns the id of the hd account
    */
   async getHDAccountId(xpub) {
     const sqlQuery = 'SELECT `hdID` FROM `hd` WHERE `hdXpub` = ?'
@@ -618,7 +618,7 @@ class MySqlDbWrapper {
    * Get the ID of an HD account. Ensures that the account exists.
    * @param {string} xpub - xpub
    * @param {string} type - hd account type
-   * @returns {integer} returns the id of the hd account
+   * @returns {number} returns the id of the hd account
    */
   async ensureHDAccountId(xpub, type) {
     const info = hdaHelper.classify(type)
@@ -650,15 +650,14 @@ class MySqlDbWrapper {
   /**
    * Lock the type of a hd account
    * @param {string} xpub - xpub
+   * @param {boolean} locked - true for locking, false for unlocking
    * @returns {boolean} locked - true for locking, false for unlocking
    */
   async setLockHDAccountType(xpub, locked) {
-    locked = !!locked
-
     const account = await this.getHDAccount(xpub)
     const info = hdaHelper.classify(account.hdType)
 
-    if (info.locked == locked)
+    if (info.locked === locked)
       return true
 
     const hdType = hdaHelper.makeType(account.hdType, locked)
@@ -700,7 +699,7 @@ class MySqlDbWrapper {
    * Add an address a hd account
    * @param {string} address - bitcoin address
    * @param {string} xpub - xpub
-   * @param {integer} chain - derivation chain
+   * @param {number} chain - derivation chain
    * @param {index} index - derivation index for the address
    */
   async addAddressToHDAccount(address, xpub, chain, index) {
@@ -733,7 +732,7 @@ class MySqlDbWrapper {
    *  which is the output of the HDAccountsHelper.deriveAddresses()
    */
   async addAddressesToHDAccount(xpub, addressData) {
-    if (addressData.length == 0)
+    if (addressData.length === 0)
       return
 
     const addresses = addressData.map(d => d.address)
@@ -769,7 +768,7 @@ class MySqlDbWrapper {
    * @returns {object[]}
    */
   async getUngroupedHDAccountsByAddresses(addresses) {
-    if (addresses.length == 0) return {}
+    if (addresses.length === 0) return {}
 
     const sqlQuery = 'SELECT \
         `hd`.`hdID`, \
@@ -814,7 +813,7 @@ class MySqlDbWrapper {
       loose: []
     }
 
-    if (addresses.length == 0)
+    if (addresses.length === 0)
       return ret
 
     const sqlQuery = 'SELECT \
@@ -865,7 +864,7 @@ class MySqlDbWrapper {
   /**
    * Get an HD account balance
    * @param {string} xpub - xpub
-   * @returns {integer} returns the balance of the hd account
+   * @returns {number} returns the balance of the hd account
    */
   async getHDAccountBalance(xpub) {
     const sqlQuery = 'SELECT \
@@ -882,7 +881,7 @@ class MySqlDbWrapper {
     const query = mysql.format(sqlQuery, params)
     const results = await this._query(query)
 
-    if (results.length == 1)
+    if (results.length === 1)
       return (results[0].balance == null) ? 0 : results[0].balance
 
     return null
@@ -891,7 +890,7 @@ class MySqlDbWrapper {
   /**
    * Get next unused address indices for each HD chain of an account
    * @param {string} xpub - xpub
-   * @returns {integer[]} returns an array of unused indices
+   * @returns {number[]} returns an array of unused indices
    *     [M/0/X, M/1/Y] -> [X,Y]
    */
   async getHDAccountNextUnusedIndices(xpub) {
@@ -921,7 +920,7 @@ class MySqlDbWrapper {
   /**
    * Get the maximum derived address index for each HD chain of an account
    * @param {string} xpub - xpub
-   * @returns {integer[]} returns an array of derived indices
+   * @returns {number[]} returns an array of derived indices
    *     [M/0/X, M/1/Y] -> [X,Y]
    */
   async getHDAccountDerivedIndices(xpub) {
@@ -950,10 +949,10 @@ class MySqlDbWrapper {
   /**
    * Get the number of indices derived in an interval for a HD chain
    * @param {string} xpub - xpub
-   * @param {integer} chain - HD chain (0 or 1)
-   * @param {integer} minIdx - min index of derivation
-   * @param {integer} maxIdx - max index of derivation
-   * @returns {integer[]} returns an array of number of derived indices
+   * @param {number} chain - HD chain (0 or 1)
+   * @param {number} minIdx - min index of derivation
+   * @param {number} maxIdx - max index of derivation
+   * @returns {number[]} returns an array of number of derived indices
    */
   async getHDAccountNbDerivedIndices(xpub, chain, minIdx, maxIdx) {
     const sqlQuery = 'SELECT \
@@ -969,7 +968,7 @@ class MySqlDbWrapper {
     const query = mysql.format(sqlQuery, params)
     const results = await this._query(query)
 
-    if (results.length == 1) {
+    if (results.length === 1) {
       const nbDerivedIndices = results[0].nbDerivedIndices
       return (nbDerivedIndices == null) ? 0 : nbDerivedIndices
     }
@@ -980,7 +979,7 @@ class MySqlDbWrapper {
   /**
    * Get the number of transactions for an HD account
    * @param {string} xpub - xpub
-   * @returns {integer} returns the balance of the hd account
+   * @returns {number} returns the balance of the hd account
    */
   async getHDAccountNbTransactions(xpub) {
     const sqlQuery = 'SELECT COUNT(DISTINCT `r`.`txnTxid`) AS nbTxs \
@@ -1007,7 +1006,7 @@ class MySqlDbWrapper {
     const query = mysql.format(sqlQuery, params)
     const results = await this._query(query)
 
-    if (results.length == 1)
+    if (results.length === 1)
       return (results[0].nbTxs == null) ? 0 : results[0].nbTxs
 
     return null
@@ -1017,12 +1016,12 @@ class MySqlDbWrapper {
    * Get the number of transactions for a list of addresses and HD accounts
    * @param {string[]} addresses - array of bitcoin addresses
    * @param {string[]} xpubs - array of xpubs
-   * @returns {int} returns the number of transactions
+   * @returns {number} returns the number of transactions
    */
   async getAddrAndXpubsNbTransactions(addresses, xpubs) {
     if (
-      (!addresses || addresses.length == 0)
-      && (!xpubs || xpubs.length == 0)
+      (!addresses || addresses.length === 0)
+      && (!xpubs || xpubs.length === 0)
     ) {
       return []
     }
@@ -1052,7 +1051,7 @@ class MySqlDbWrapper {
     let query = mysql.format(sqlQuery)
     const results = await this._query(query)
 
-    if (results.length == 1)
+    if (results.length === 1)
       return (results[0].nbTxs == null) ? 0 : results[0].nbTxs
 
     return null
@@ -1062,12 +1061,14 @@ class MySqlDbWrapper {
    * Get the transactions for a list of addresses and HD accounts
    * @param {string[]} addresses - array of bitcoin addresses
    * @param {string[]} xpubs - array of xpubs
+   * @param {number=} page - page
+   * @param {number=} nbTxsPerPage - number of transactions per page
    * @returns {object[]} returns an array of transactions
    */
   async getTxsByAddrAndXpubs(addresses, xpubs, page, nbTxsPerPage) {
     if (
-      (!addresses || addresses.length == 0)
-      && (!xpubs || xpubs.length == 0)
+      (!addresses || addresses.length === 0)
+      && (!xpubs || xpubs.length === 0)
     ) {
       return []
     }
@@ -1117,7 +1118,7 @@ class MySqlDbWrapper {
 
     const txsIds = txs.map(t => t.txnID)
 
-    if (txsIds.length == 0)
+    if (txsIds.length === 0)
       return []
 
     // Prepares subqueries for
@@ -1189,7 +1190,7 @@ class MySqlDbWrapper {
       }
     }
 
-    if (input.hdXpub && input.hdXpub !== null) {
+    if (input.hdXpub) {
       ret.prev_out.xpub = {
         m: input.hdXpub,
         path: ['M', input.hdAddrChain, input.hdAddrIndex].join('/')
@@ -1211,7 +1212,7 @@ class MySqlDbWrapper {
       addr: output.outAddress
     }
 
-    if (output.hdXpub && output.hdXpub !== null) {
+    if (output.hdXpub) {
       ret.xpub = {
         m: output.hdXpub,
         path: ['M', output.hdAddrChain, output.hdAddrIndex].join('/')
@@ -1294,7 +1295,7 @@ class MySqlDbWrapper {
   async getXpubByAddresses(addresses) {
     const ret = {}
 
-    if (addresses.length == 0)
+    if (addresses.length === 0)
       return ret
 
     const sqlQuery = 'SELECT `hd`.`hdXpub`, `addresses`.`addrAddress` \
@@ -1316,7 +1317,7 @@ class MySqlDbWrapper {
   /**
    * Get the mysql ID of a transaction. Ensures that the transaction exists.
    * @param {string} txid - txid of a transaction
-   * @returns {integer} returns the transaction id (mysql id)
+   * @returns {number} returns the transaction id (mysql id)
    */
   async ensureTransactionId(txid) {
     const sqlQuery = 'INSERT IGNORE INTO `transactions` SET ?'
@@ -1346,14 +1347,14 @@ class MySqlDbWrapper {
   /**
    * Get the mysql ID of a transaction
    * @param {string} txid - txid of a transaction
-   * @returns {integer} returns the transaction id (mysql id)
+   * @returns {number} returns the transaction id (mysql id)
    */
   async getTransactionId(txid) {
     const sqlQuery = 'SELECT `txnID` FROM `transactions` WHERE `txnTxid` = ?'
     const params = txid
     const query = mysql.format(sqlQuery, params)
     const result = await this._query(query)
-    return (result.length == 0) ? null : result[0].txnID
+    return (result.length === 0) ? null : result[0].txnID
   }
 
   /**
@@ -1362,7 +1363,7 @@ class MySqlDbWrapper {
    * @returns {object[]} returns an array of {txnTxid: txnId}
    */
   async getTransactionsIds(txids) {
-    if (txids.length == 0)
+    if (txids.length === 0)
       return []
 
     const sqlQuery = 'SELECT `txnID`, `txnTxid` FROM `transactions` WHERE `txnTxid` IN (?)'
@@ -1378,11 +1379,11 @@ class MySqlDbWrapper {
 
   /**
    * Get the mysql IDs of a set of transactions
-   * @param {string[]} txid - array of transactions txids
-   * @returns {integer[]} returns an array of transaction ids (mysql ids)
+   * @param {string[]} txnIDs - array of transactions txids
+   * @returns {number[]} returns an array of transaction ids (mysql ids)
    */
   async getTransactionsById(txnIDs) {
-    if (txnIDs.length == 0)
+    if (txnIDs.length === 0)
       return []
 
     const sqlQuery = 'SELECT * FROM `transactions` WHERE `txnID` IN (?)'
@@ -1419,7 +1420,7 @@ class MySqlDbWrapper {
    * @param {object[]} txs - array of {txid, version, locktime}
    */
   async addTransactions(txs) {
-    if (txs.length == 0)
+    if (txs.length === 0)
       return
 
     const sqlQuery = 'INSERT INTO `transactions` \
@@ -1567,10 +1568,10 @@ class MySqlDbWrapper {
   /**
    * Batch confirm txids in a block
    * @param {string[]} txnTxidArray - array of transaction txids
-   * @param {integer} blockID - mysql id of the blck
+   * @param {number} blockID - mysql id of the blck
    */
   async confirmTransactions(txnTxidArray, blockID) {
-    if (txnTxidArray.length == 0)
+    if (txnTxidArray.length === 0)
       return
 
     const sqlQuery = 'UPDATE `transactions` SET `blockID` = ? WHERE `txnTxid` IN (?)'
@@ -1581,8 +1582,8 @@ class MySqlDbWrapper {
 
   /**
    * Get the transactions confirmed after a given height
-   * @param {integer]} height - block height
-   * @param {object[]} returns an array of transactions
+   * @param {number} height - block height
+   * @returns {object[]} returns an array of transactions
    */
   async getTransactionsConfirmedAfterHeight(height) {
     const sqlQuery = 'SELECT `transactions`.* FROM `transactions` \
@@ -1595,7 +1596,7 @@ class MySqlDbWrapper {
 
   /**
    * Delete the transactions confirmed after a given height
-   * @param {integer]} height - block height
+   * @param {number} height - block height
    */
   async deleteTransactionsConfirmedAfterHeight(height) {
     const sqlQuery = 'DELETE `transactions`.* FROM `transactions` \
@@ -1611,7 +1612,7 @@ class MySqlDbWrapper {
    * @param {string[]} txnTxidArray - array of transaction txids
    */
   async unconfirmTransactions(txnTxidArray) {
-    if (txnTxidArray.length == 0)
+    if (txnTxidArray.length === 0)
       return
 
     const sqlQuery = 'UPDATE `transactions` SET `blockID` = NULL WHERE `txnTxid` IN (?)'
@@ -1633,10 +1634,10 @@ class MySqlDbWrapper {
 
   /**
    * Delete a set of transactions identified by their mysql ids
-   * @param {integer[]} txnIDs - mysql ids of the transactions
+   * @param {number[]} txnIDs - mysql ids of the transactions
    */
   async deleteTransactionsByID(txnIDs) {
-    if (txnIDs.length == 0)
+    if (txnIDs.length === 0)
       return []
 
     const sqlQuery = 'DELETE `transactions`.* FROM `transactions` WHERE `transactions`.`txnID` in (?)'
@@ -1650,7 +1651,7 @@ class MySqlDbWrapper {
    * @param {object[]} outputs - array of {txnID, addrID, outIndex, outAmount, outScript}
    */
   async addOutputs(outputs) {
-    if (outputs.length == 0)
+    if (outputs.length === 0)
       return
 
     const sqlQuery = 'INSERT IGNORE INTO `outputs` \
@@ -1671,7 +1672,7 @@ class MySqlDbWrapper {
    *  {addrAddress, outID, outAmount, txnTxid, outIndex, spendingTxnID/null, spendingInID/null}
    */
   async getOutputSpends(spends) {
-    if (spends.length == 0)
+    if (spends.length === 0)
       return []
 
     const whereClauses =
@@ -1703,7 +1704,7 @@ class MySqlDbWrapper {
    *  {outID, txnTxid, outIndex}
    */
   async getOutputIds(spends) {
-    if (spends.length == 0)
+    if (spends.length === 0)
       return []
 
     const whereClauses =
@@ -1730,7 +1731,7 @@ class MySqlDbWrapper {
    *  {txnTxid, outIndex, outAmount, outScript, addrAddress}
    */
   async getUnspentOutputs(addresses) {
-    if (addresses.length == 0)
+    if (addresses.length === 0)
       return []
 
     const sqlQuery = 'SELECT \
@@ -1761,7 +1762,7 @@ class MySqlDbWrapper {
    *  {txnID, outID, inIndex, inSequence}
    */
   async addInputs(inputs) {
-    if (inputs.length == 0)
+    if (inputs.length === 0)
       return
 
     const sqlQuery = 'INSERT INTO `inputs` \
@@ -1811,7 +1812,7 @@ class MySqlDbWrapper {
     const params = hash
     const query = mysql.format(sqlQuery, params)
     const result = await this._query(query)
-    return (result.length == 1) ? result[0] : null
+    return (result.length === 1) ? result[0] : null
   }
 
   /**
@@ -1820,7 +1821,7 @@ class MySqlDbWrapper {
    * @returns {object[]} returns the blocks
    */
   async getBlocksByHashes(hashes) {
-    if (hashes.length == 0)
+    if (hashes.length === 0)
       return []
 
     const sqlQuery = 'SELECT * FROM `blocks` WHERE `blockHash` IN (?)'
@@ -1831,7 +1832,7 @@ class MySqlDbWrapper {
 
   /**
    * Get details about all blocks at a given block height
-   * @param {integer} height - block height
+   * @param {number} height - block height
    * @returns {object[]} returns an array of blocks
    */
   async getBlocksByHeight(height) {
@@ -1843,7 +1844,7 @@ class MySqlDbWrapper {
 
   /**
    * Delete the blocks after a given block height
-   * @param {integer} height - block height
+   * @param {number} height - block height
    */
   async deleteBlocksAfterHeight(height) {
     const sqlQuery = 'DELETE FROM `blocks` WHERE `blockHeight` > ?'
@@ -1854,12 +1855,12 @@ class MySqlDbWrapper {
 
   /**
    * Gets the last block
-   * @returns {object} returns the last block
+   * @returns {object | null} returns the last block
    */
   async getHighestBlock() {
     try {
       const results = await this.getLastBlocks(1)
-      if (results == null || results.length == 0)
+      if (results == null || results.length === 0)
         return {
           blockID: null,
           blockHeight: 0
@@ -1873,7 +1874,7 @@ class MySqlDbWrapper {
 
   /**
    * Gets the N last blocks
-   * @param {integer} n - number of blocks to be retrieved
+   * @param {number} n - number of blocks to be retrieved
    * @returns {object[]} returns an array of the n last blocks
    */
   async getLastBlocks(n) {
@@ -1896,14 +1897,14 @@ class MySqlDbWrapper {
   /**
    * Get the mysql ID of a scheduled transaction
    * @param {string} txid - txid of a scheduled transaction
-   * @returns {integer} returns the scheduled transaction id (mysql id)
+   * @returns {number} returns the scheduled transaction id (mysql id)
    */
   async getScheduledTransactionId(txid) {
     const sqlQuery = 'SELECT `schID` FROM `scheduled_transactions` WHERE `schTxid` = ?'
     const params = txid
     const query = mysql.format(sqlQuery, params)
     const result = await this._query(query)
-    return (result.length == 0) ? null : result[0].txnID
+    return (result.length === 0) ? null : result[0].txnID
   }
 
   /**
@@ -1952,7 +1953,7 @@ class MySqlDbWrapper {
   /**
    * Get scheduled transactions
    * with a trigger lower than a given block height
-   * @param {integer} height - block height
+   * @param {number} height - block height
    */
   async getActivatedScheduledTransactions(height) {
     const sqlQuery = 'SELECT * FROM `scheduled_transactions` \
@@ -1964,7 +1965,7 @@ class MySqlDbWrapper {
 
   /**
    * Get the scheduled transaction having a given parentID
-   * @param {integer} parentId - parent ID
+   * @param {number} parentId - parent ID
    * @returns {object[]} returns an array of scheduled transactions
    */
   async getNextScheduledTransactions(parentId) {
@@ -1978,8 +1979,8 @@ class MySqlDbWrapper {
   /**
    * Update the trigger of a scheduled transaction
    * identified by its ID
-   * @param {integer} id - id of the scheduled transaction
-   * @param {integer} trigger - new trigger
+   * @param {number} id - id of the scheduled transaction
+   * @param {number} trigger - new trigger
    */
   async updateTriggerScheduledTransaction(id, trigger) {
     const sqlQuery = 'UPDATE `scheduled_transactions` \
diff --git a/lib/http-server/http-server.js b/lib/http-server/http-server.js
index ee490b7..40515ad 100644
--- a/lib/http-server/http-server.js
+++ b/lib/http-server/http-server.js
@@ -19,7 +19,7 @@ class HttpServer {
 
   /**
    * Constructor
-   * @param {int} port - port used by the http server
+   * @param {number} port - port used by the http server
    * @param {string} host - host exposing the http server
    */
   constructor(port, host) {
@@ -95,6 +95,7 @@ class HttpServer {
   /**
    * Return a http response without status
    * @param {object} res - http response object
+   * @param {object} data
    */
   static sendOkDataOnly(res, data) {
     res.status(200).json(data)
diff --git a/lib/indexer-rpc/rpc-client.js b/lib/indexer-rpc/rpc-client.js
index 7c71863..9be3ac4 100644
--- a/lib/indexer-rpc/rpc-client.js
+++ b/lib/indexer-rpc/rpc-client.js
@@ -63,11 +63,11 @@ class RpcClient {
    * @returns {boolean} returns true if message related to a connection error
    */
   static isConnectionError(err) {
-    if (typeof err != 'string')
+    if (typeof err !== 'string')
       return false
 
-    const isTimeoutError = (err.indexOf('connect ETIMEDOUT') != -1)
-    const isConnRejected = (err.indexOf('Connection Rejected') != -1)
+    const isTimeoutError = (err.indexOf('connect ETIMEDOUT') !== -1)
+    const isConnRejected = (err.indexOf('Connection Rejected') !== -1)
 
     return (isTimeoutError || isConnRejected)
   }
@@ -122,6 +122,7 @@ class RpcClient {
   /**
    * Send requests (internal method)
    * @param {Object[]} data - array of objects {method: ..., params: ...}
+   * @param {boolean=} batched - batch requests
    * @returns {Promise}
    */
   async _call(data, batched) {
@@ -174,7 +175,7 @@ class RpcClient {
         for (let c of chunk) {
           response += c
           // Detect the end of a response
-          if (c == '\n') {
+          if (c === '\n') {
             try {
               // Parse the response
               let parsed = JSON.parse(response)
@@ -190,7 +191,7 @@ class RpcClient {
               response = ''
               // If all responses have been received
               // close the connection
-              if (responses.length == data.length)
+              if (responses.length === data.length)
                 conn.end()
             } catch (err) {
               reject(
diff --git a/lib/remote-importer/esplora-wrapper.js b/lib/remote-importer/esplora-wrapper.js
index 1a82039..1603a37 100644
--- a/lib/remote-importer/esplora-wrapper.js
+++ b/lib/remote-importer/esplora-wrapper.js
@@ -20,6 +20,8 @@ class EsploraWrapper extends Wrapper {
 
   /**
    * Constructor
+   * @constructor
+   * @param {string} url
    */
   constructor(url) {
     super(url, keys.indexer.socks5Proxy)
@@ -87,7 +89,7 @@ class EsploraWrapper extends Wrapper {
     while (true) {
       const txids = await this._getTxsForAddress(address, lastSeenTxid)
 
-      if (txids.length == 0)
+      if (txids.length === 0)
         // we have all the transactions
         return ret
 
diff --git a/lib/remote-importer/local-indexer-wrapper.js b/lib/remote-importer/local-indexer-wrapper.js
index dbf480f..5730d72 100644
--- a/lib/remote-importer/local-indexer-wrapper.js
+++ b/lib/remote-importer/local-indexer-wrapper.js
@@ -104,7 +104,7 @@ class LocalIndexerWrapper extends Wrapper {
     })
 
     // Send the requests
-    const results = (keys.indexer.localIndexer.batchRequests == 'active')
+    const results = (keys.indexer.localIndexer.batchRequests === 'active')
       ? await this.client.sendBatch(commands)
       : await this.client.sendRequests(commands)
 
diff --git a/lib/remote-importer/local-rest-indexer-wrapper.js b/lib/remote-importer/local-rest-indexer-wrapper.js
index 0ec7677..7445b7f 100644
--- a/lib/remote-importer/local-rest-indexer-wrapper.js
+++ b/lib/remote-importer/local-rest-indexer-wrapper.js
@@ -22,6 +22,8 @@ class LocalRestIndexerWrapper extends Wrapper {
 
   /**
    * Constructor
+   * @constructor
+   * @param {string} url
    */
   constructor(url) {
     super(url, null)
diff --git a/lib/remote-importer/oxt-wrapper.js b/lib/remote-importer/oxt-wrapper.js
index 6bc66fa..5e761d2 100644
--- a/lib/remote-importer/oxt-wrapper.js
+++ b/lib/remote-importer/oxt-wrapper.js
@@ -18,6 +18,8 @@ class OxtWrapper extends Wrapper {
 
   /**
    * Constructor
+   * @constructor
+   * @param {string} url
    */
   constructor(url) {
     super(url, keys.indexer.socks5Proxy)
@@ -123,7 +125,7 @@ class OxtWrapper extends Wrapper {
   async getChainTipHeight() {
     let chainTipHeight = null
     const result = await this._get(`/lastblock`)
-    if (result != null && result['data'].length == 1)
+    if (result != null && result['data'].length === 1)
       chainTipHeight = parseInt(result['data'][0]['height'])
     return {'chainTipHeight': chainTipHeight}
   }
diff --git a/lib/remote-importer/remote-importer.js b/lib/remote-importer/remote-importer.js
index d56b319..6f05024 100644
--- a/lib/remote-importer/remote-importer.js
+++ b/lib/remote-importer/remote-importer.js
@@ -17,7 +17,7 @@ const gap = keys.gap
 
 let Sources
 
-if (network.key == 'bitcoin') {
+if (network.key === 'bitcoin') {
   Sources = require('./sources-mainnet')
 } else {
   Sources = require('./sources-testnet')
@@ -64,8 +64,8 @@ class RemoteImporter {
    * Import an HD account from remote sources
    * @param {string} xpub - HD Account
    * @param {string} type - type of HD Account
-   * @param {integer} gapLimit - (optional) gap limit for derivation
-   * @param {integer} startIndex - (optional) rescan shall start from this index
+   * @param {number} gapLimit - (optional) gap limit for derivation
+   * @param {number} startIndex - (optional) rescan shall start from this index
    */
   async importHDAccount(xpub, type, gapLimit, startIndex) {
     if (!hdaHelper.isValid(xpub))
@@ -202,7 +202,7 @@ class RemoteImporter {
       }
 
       if (gotTransactions) {
-        const keyStatus = (c == 0) ? 'txs_ext' : 'txs_int'
+        const keyStatus = (c === 0) ? 'txs_ext' : 'txs_int'
         this.importing[xpub][keyStatus] = Object.keys(txids).length
         // We must go deeper
         const result = await this.xpubScan(xpub, c, d, u, G, type, txids)
@@ -236,7 +236,7 @@ class RemoteImporter {
     const addresses = candidates.filter(c => !this.importing[c])
     this.importing = addresses.reduce((m,a) => (m[a] = true, m), this.importing)
 
-    if (addresses.length == 0) return true
+    if (addresses.length === 0) return true
 
     Logger.info(`Importer : Importing ${addresses.join(',')}`)
 
@@ -318,8 +318,8 @@ class RemoteImporter {
       const blocks = await db.getBlocksByHashes(blocksHashes)
 
       return util.parallelCall(blocks, block => {
-        const filteredTxs = txs.filter(tx => (tx.block && tx.block.hash == block.blockHash))
-        if (filteredTxs.length == 0) return
+        const filteredTxs = txs.filter(tx => (tx.block && tx.block.hash === block.blockHash))
+        if (filteredTxs.length === 0) return
         const txids = filteredTxs.map(tx => tx.txid)
         return db.confirmTransactions(txids, block.blockID)
       })
diff --git a/lib/remote-importer/sources-mainnet.js b/lib/remote-importer/sources-mainnet.js
index 48ce6a7..79dbb4f 100644
--- a/lib/remote-importer/sources-mainnet.js
+++ b/lib/remote-importer/sources-mainnet.js
@@ -31,17 +31,17 @@ class SourcesMainnet extends Sources {
    * Initialize the external data source
    */
   _initSource() {
-    if (keys.indexer.active == 'local_bitcoind') {
+    if (keys.indexer.active === 'local_bitcoind') {
       // If local bitcoind option is activated
       // we'll use the local node as our unique source
       this.source = new BitcoindWrapper()
       Logger.info('Importer : Activated Bitcoind as the data source for imports')
-    } else if (keys.indexer.active == 'local_indexer') {
+    } else if (keys.indexer.active === 'local_indexer') {
       // If local indexer option is activated
       // we'll use the local indexer as our unique source
       this.source = new LocalIndexerWrapper()
       Logger.info('Importer : Activated local indexer as the data source for imports')
-    } else if (keys.indexer.active == 'local_rest_indexer') {
+    } else if (keys.indexer.active === 'local_rest_indexer') {
       // If local rest indexer option is activated
       // we'll use the local indexer as our unique source
       const uri = `http://${keys.indexer.localIndexer.host}:${keys.indexer.localIndexer.port}`
diff --git a/lib/remote-importer/sources-testnet.js b/lib/remote-importer/sources-testnet.js
index 3ee3907..d1068e3 100644
--- a/lib/remote-importer/sources-testnet.js
+++ b/lib/remote-importer/sources-testnet.js
@@ -32,17 +32,17 @@ class SourcesTestnet extends Sources {
    * Initialize the external data source
    */
   _initSource() {
-    if (keys.indexer.active == 'local_bitcoind') {
+    if (keys.indexer.active === 'local_bitcoind') {
       // If local bitcoind option is activated
       // we'll use the local node as our unique source
       this.source = new BitcoindWrapper()
       Logger.info('Importer : Activated Bitcoind as the data source for imports')
-    } else if (keys.indexer.active == 'local_indexer') {
+    } else if (keys.indexer.active === 'local_indexer') {
       // If local indexer option is activated
       // we'll use the local indexer as our unique source
       this.source = new LocalIndexerWrapper()
       Logger.info('Importer : Activated local indexer as the data source for imports')
-    } else if (keys.indexer.active == 'local_rest_indexer') {
+    } else if (keys.indexer.active === 'local_rest_indexer') {
       // If local rest indexer option is activated
       // we'll use the local indexer as our unique source
       const uri = `http://${keys.indexer.localIndexer.host}:${keys.indexer.localIndexer.port}`
diff --git a/lib/remote-importer/wrapper.js b/lib/remote-importer/wrapper.js
index 4272e09..038ecd6 100644
--- a/lib/remote-importer/wrapper.js
+++ b/lib/remote-importer/wrapper.js
@@ -16,6 +16,9 @@ class Wrapper {
 
   /**
    * Constructor
+   * @constructor
+   * @param {string} url
+   * @param {string=} socks5Proxy
    */
   constructor(url, socks5Proxy) {
     this.base = url
diff --git a/lib/util.js b/lib/util.js
index 0c96d04..8a08080 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -5,18 +5,22 @@
 'use strict'
 
 /**
- * Class providing utility functions as static methods
+ * @class Util
+ * @description Class providing utility functions as static methods
  */
 class Util {
 
   /**
    * Constructor
+   * @constructor
    */
   constructor() {}
 
   /**
-   * Serialize a series of asynchronous calls to a function
-   * over a list of objects
+   * @description Serialize a series of asynchronous calls to a function over a list of objects
+   * @param {Array<any>} list
+   * @param {function} fn
+   * @returns {Promise<Array<any>>}
    */
   static async seriesCall(list, fn) {
     const results = []
@@ -29,8 +33,10 @@ class Util {
   }
 
   /**
-   * Execute parallel asynchronous calls to a function
-   * over a list of objects
+   * @description Execute parallel asynchronous calls to a function over a list of objects
+   * @param {Array<any>} list
+   * @param {function} fn
+   * @returns {Promise<Array<any>>}
    */
   static parallelCall(list, fn) {
     const operations = list.map(item => { return fn(item) })
@@ -38,16 +44,21 @@ class Util {
   }
 
   /**
-   * Delay the call to a function
+   * @description Delay the call to a function
+   * @param {number} ms
+   * @returns {Promise<void>}
    */
-  static delay(ms, v) {
+  static delay(ms) {
     return new Promise(resolve => {
-      setTimeout(resolve.bind(null, v), ms)
+      setTimeout(() => resolve(), ms)
     })
   }
 
   /**
-   * Splits a list into a list of lists each with maximum length LIMIT
+   * @description Splits a list into a list of lists each with maximum length LIMIT
+   * @param {Array<any>} list
+   * @param {number} limit
+   * @returns {Array<Array<any>>}
    */
   static splitList(list, limit) {
     const lists = []
@@ -57,7 +68,9 @@ class Util {
   }
 
   /**
-   * Check if a string is a valid hex value
+   * @description Check if a string is a valid hex value
+   * @param {string} hash
+   * @returns {boolean}
    */
   static isHashStr(hash) {
     const hexRegExp = new RegExp(/^[0-9a-f]*$/, 'i')
@@ -65,49 +78,64 @@ class Util {
   }
 
   /**
-   * Check if a string is a well formed 256 bits hash
+   * @description Check if a string is a well formed 256 bits hash
+   * @param {string} hash
+   * @returns {boolean}
    */
   static is256Hash(hash) {
-    return Util.isHashStr(hash) && hash.length == 64
+    return Util.isHashStr(hash) && hash.length === 64
   }
 
 
   /**
-   * Sum an array of values
+   * @description Sum an array of values
+   * @param {Array<number>} arr
+   * @returns {number}
    */
   static sum(arr) {
     return arr.reduce((memo, val) => { return memo + val }, 0)
   }
 
   /**
-   * Mean of an array of values
+   * @description Mean of an array of values
+   * @param {Array<number>} arr
+   * @returns {number}
    */
   static mean(arr) {
-    if (arr.length == 0)
+    if (arr.length === 0)
       return NaN
     return sum(arr) / arr.length
   }
 
   /**
-   * Compare 2 values (asc order)
+   * @description Compare 2 values (asc order)
+   * @param {number} a
+   * @param {number} b
+   * @returns {number}
    */
   static cmpAsc(a, b) {
     return a - b
   }
 
   /**
-   * Compare 2 values (desc order)
+   * @description Compare 2 values (desc order)
+   * @param {number} a
+   * @param {number} b
+   * @returns {number}
    */
   static cmpDesc(a,b) {
     return b - a
   }
 
   /**
-   * Median of an array of values
+   * @description Median of an array of values
+   * @param {Array<number>} arr
+   * @param {boolean=} sorted
+   * @returns {number}
    */
   static median(arr, sorted) {
-    if (arr.length == 0) return NaN
-    if (arr.length == 1) return arr[0]
+    if (arr.length === 0) return NaN
+    if (arr.length === 1) return arr[0]
 
     if (!sorted)
       arr.sort(Util.cmpAsc)
@@ -124,7 +152,10 @@ class Util {
   }
 
   /**
-   * Median Absolute Deviation of an array of values
+   * @description Median Absolute Deviation of an array of values
+   * @param {Array<number>} arr
+   * @param {boolean=} sorted
+   * @returns {number}
    */
   static mad(arr, sorted) {
     const med = Util.median(arr, sorted)
@@ -136,7 +167,10 @@ class Util {
   }
 
   /**
-   * Quartiles of an array of values
+   * @description Quartiles of an array of values
+   * @param {Array<number>} arr
+   * @param {boolean=} sorted
+   * @returns {Array<number>}
    */
   static quartiles(arr, sorted) {
     const q = [NaN,NaN,NaN]
@@ -156,10 +190,10 @@ class Util {
       const mod4 = arr.length % 4
       const n = Math.floor(arr.length / 4)
 
-      if (mod4 == 1) {
+      if (mod4 === 1) {
         q[0] = (arr[n-1] + 3 * arr[n]) / 4
         q[2] = (3 * arr[3*n] + arr[3*n+1]) / 4
-      } else if (mod4 == 3) {
+      } else if (mod4 === 3) {
         q[0] = (3 * arr[n] + arr[n+1]) / 4
         q[2] = (arr[3*n+1] + 3 * arr[3*n+2]) / 4
       }
@@ -174,7 +208,11 @@ class Util {
   }
 
   /**
-   * Obtain the value of the PCT-th percentile, where PCT on [0,100]
+   * @description Obtain the value of the PCT-th percentile, where PCT on [0,100]
+   * @param {Array<number>} arr
+   * @param {number} pct
+   * @param {boolean=} sorted
+   * @returns {number}
    */
   static percentile(arr, pct, sorted) {
     if (arr.length < 2) return NaN
@@ -210,28 +248,35 @@ class Util {
   }
 
   /**
-   * Convert bytes to Mb
+   * @description Convert bytes to MB
+   * @param {number} bytes
+   * @returns {number}
    */
   static toMb(bytes) {
     return +(bytes / Util.MB).toFixed(0)
   }
 
   /**
-   * Convert a date to a unix timestamp
+   * @description Convert a date to a unix timestamp
+   * @returns {number}
    */
   static unix() {
     return (Date.now() / 1000) | 0
   }
 
   /**
-   * Convert a value to a padded string (10 chars)
+   * @description Convert a value to a padded string (10 chars)
+   * @param {number} v
+   * @returns {string}
    */
   static pad10(v) {
     return (v < 10) ? `0${v}` : `${v}`
   }
 
   /**
-   * Convert a value to a padded string (100 chars)
+   * @description Convert a value to a padded string (100 chars)
+   * @param {number} v
+   * @returns {string}
    */
   static pad100(v) {
     if (v < 10) return `00${v}`
@@ -240,7 +285,9 @@ class Util {
   }
 
   /**
-   * Convert a value to a padded string (1000 chars)
+   * @description Convert a value to a padded string (1000 chars)
+   * @param {number} v
+   * @returns {string}
    */
   static pad1000(v) {
     if (v < 10) return `000${v}`
@@ -250,7 +297,11 @@ class Util {
   }
 
   /**
-   * Left pad
+   * @description Left pad
+   * @param {number} number
+   * @param {number} places
+   * @param {string=} fill
+   * @returns {string}
    */
   static leftPad(number, places, fill) {
     number = Math.round(number)
@@ -271,7 +322,10 @@ class Util {
   }
 
   /**
-   * Display a time period, in seconds, as DDD:HH:MM:SS[.MS]
+   * @description Display a time period, in seconds, as DDD:HH:MM:SS[.MS]
+   * @param {number} period
+   * @param {number} milliseconds
+   * @returns {string}
    */
   static timePeriod(period, milliseconds) {
     milliseconds = !!milliseconds
diff --git a/lib/wallet/address-info.js b/lib/wallet/address-info.js
index 194aba2..0ea652a 100644
--- a/lib/wallet/address-info.js
+++ b/lib/wallet/address-info.js
@@ -9,13 +9,15 @@ const hdaHelper = require('../bitcoin/hd-accounts-helper')
 
 
 /**
- * A class storing information about the actibity of an address
+ * @class AddressInfo
+ * @description A class storing information about the actibity of an address
  */
 class AddressInfo {
 
   /**
    * Constructor
-   * @param {object} address - bitcoin address
+   * @constructor
+   * @param {string} address - bitcoin address
    */
   constructor(address) {
     // Initializes properties
@@ -25,7 +27,7 @@ class AddressInfo {
     this.nTx = 0
     this.unspentOutputs = []
 
-    this.tracked = false,
+    this.tracked = false
     this.type = 'untracked'
     this.xpub = null
     this.path = null
@@ -34,8 +36,8 @@ class AddressInfo {
   }
 
   /**
-   * Load information about the address
-   * @returns {Promise}
+   * @description Load information about the address
+   * @returns {Promise<void[]>}
    */
   async loadInfo() {
     return Promise.all([
@@ -57,9 +59,8 @@ class AddressInfo {
   }
 
   /**
-   * Load information about the address
-   * (extended form)
-   * @returns {Promise}
+   * @description Load information about the address (extended form)
+   * @returns {Promise<void[]>}
    */
   async loadInfoExtended() {
     const res = await db.getHDAccountsByAddresses([this.address])
@@ -75,7 +76,7 @@ class AddressInfo {
     }
 
     for (let a of res.loose) {
-      if (a.addrAddress == this.address) {
+      if (a.addrAddress === this.address) {
         this.tracked = true
         this.type = 'loose'
         break
@@ -86,9 +87,9 @@ class AddressInfo {
   }
 
   /**
-   * Loads a partial list of transactions for this address
-   * @param {integer} page - page index
-   * @param {integer} count - number of transactions per page
+   * @description Loads a partial list of transactions for this address
+   * @param {number} page - page index
+   * @param {number} count - number of transactions per page
    * @returns {Promise}
    */
   async loadTransactions(page, count) {
@@ -96,8 +97,8 @@ class AddressInfo {
   }
 
   /**
-   * Load the utxos associated to the address
-   * @returns {Promise - object[]}
+   * @description Load the utxos associated to the address
+   * @returns {Promise<object[]>}
    */
   async loadUtxos() {
     this.unspentOutputs = []
@@ -118,7 +119,7 @@ class AddressInfo {
   }
 
   /**
-   * Return a plain old js object with address properties
+   * @description Return a plain old js object with address properties
    * @returns {object}
    */
   toPojo() {
@@ -135,8 +136,7 @@ class AddressInfo {
   }
 
   /**
-   * Return a plain old js object with address properties
-   * (extended version)
+   * @description Return a plain old js object with address properties (extended version)
    * @returns {object}
    */
   toPojoExtended() {
diff --git a/lib/wallet/hd-account-info.js b/lib/wallet/hd-account-info.js
index 47a91eb..2f9f4e7 100644
--- a/lib/wallet/hd-account-info.js
+++ b/lib/wallet/hd-account-info.js
@@ -12,13 +12,14 @@ const rpcLatestBlock = require('../bitcoind-rpc/latest-block')
 
 
 /**
- * A class storing information about the actibity of a hd account
+ * @class HdAccountInfo
+ * @description A class storing information about the actibity of a hd account
  */
 class HdAccountInfo {
 
   /**
    * Constructor
-   * @param {object} xpub - xpub
+   * @param {string} xpub - xpub
    */
   constructor(xpub) {
     // Initializes properties
@@ -39,9 +40,8 @@ class HdAccountInfo {
   }
 
   /**
-   * Ensure the hd account exists in database
-   * Otherwise, tries to import it with BIP44 derivation
-   * @returns {Promise - integer} return the internal id of the hd account
+   * @description Ensure the hd account exists in database. Otherwise, tries to import it with BIP44 derivation
+   * @returns {Promise<number | null>} return the internal id of the hd account
    *    or null if it doesn't exist
    */
   async ensureHdAccount() {
@@ -49,7 +49,7 @@ class HdAccountInfo {
       const id = await db.getHDAccountId(this.xpub)
       return id
     } catch(e) {
-      if (e == errors.db.ERROR_NO_HD_ACCOUNT) {
+      if (e === errors.db.ERROR_NO_HD_ACCOUNT) {
         try {
           // Default to BIP44 import
           return hdaService.restoreHdAccount(this.xpub, hdaHelper.BIP44)
@@ -62,8 +62,8 @@ class HdAccountInfo {
   }
 
   /**
-   * Load information about the hd account
-   * @returns {Promise}
+   * @description Load information about the hd account
+   * @returns {Promise<boolean>}
    */
   async loadInfo() {
     try {
@@ -93,29 +93,41 @@ class HdAccountInfo {
     this.depth = node[2].depth
   }
 
+  /**
+   * @returns {Promise<void>}
+   */
   async _loadBalance() {
     this.finalBalance = await db.getHDAccountBalance(this.xpub)
   }
 
+  /**
+   * @returns {Promise<void>}
+   */
   async _loadUnusedIndices() {
     const unusedIdx = await db.getHDAccountNextUnusedIndices(this.xpub)
     this.accountIndex = unusedIdx[0]
     this.changeIndex = unusedIdx[1]
   }
 
+  /**
+   * @returns {Promise<void>}
+   */
   async _loadDerivedIndices() {
     const derivedIdx = await db.getHDAccountDerivedIndices(this.xpub)
     this.accountDerivedIndex = derivedIdx[0]
     this.changeDerivedIndex = derivedIdx[1]
   }
 
+  /**
+   * @returns {Promise<void>}
+   */
   async _loadNbTransactions() {
     this.nTx = await db.getHDAccountNbTransactions(this.xpub)
   }
 
   /**
-   * Load the utxos associated to the hd account
-   * @returns {Promise - object[]}
+   * @description Load the utxos associated to the hd account
+   * @returns {Promise<object[]>}
    */
   async loadUtxos() {
     this.unspentOutputs = []
@@ -153,7 +165,7 @@ class HdAccountInfo {
   }
 
   /**
-   * Return a plain old js object with hd account properties
+   * @description Return a plain old js object with hd account properties
    * @returns {object}
    */
   toPojo() {
@@ -169,8 +181,7 @@ class HdAccountInfo {
   }
 
   /**
-   * Return a plain old js object with hd account properties
-   * (extended version)
+   * @description Return a plain old js object with hd account properties (extended version)
    * @returns {object}
    */
   toPojoExtended() {
diff --git a/lib/wallet/wallet-entities.js b/lib/wallet/wallet-entities.js
index 0f88f52..73a65ff 100644
--- a/lib/wallet/wallet-entities.js
+++ b/lib/wallet/wallet-entities.js
@@ -6,13 +6,13 @@
 
 
 /**
- * A class storing entities (xpubs, addresses, pubkeys) 
- * defining a (full|partial) wallet
+ * @class WalletEntities
+ * @description A class storing entities (xpubs, addresses, pubkeys) defining a (full|partial) wallet
  */
 class WalletEntities {
 
   /**
-   * Constructor
+   * @constructor
    */
   constructor() {
     this.pubkeys = []
@@ -23,8 +23,7 @@ class WalletEntities {
   }
 
   /**
-   * Add a new hd account 
-   * with its translation as an xpub
+   * @description Add a new hd account with its translation as an xpub
    * @param {string} xpub - xpub or tpub
    * @param {string} ypub - ypub or upub or false
    * @param {string} zpub - zpub or vpub or false
@@ -36,7 +35,7 @@ class WalletEntities {
   }
 
   /**
-   * Add a new address/pubkey
+   * @description Add a new address/pubkey
    * @param {string} address - bitcoin address
    * @param {string} pubkey - pubkey associated to the address or false
    */
@@ -46,7 +45,7 @@ class WalletEntities {
   }
 
   /**
-   * Update the pubkey associated to a given address
+   * @description Update the pubkey associated to a given address
    * @param {string} address - bitcoin address
    * @param {string} pubkey - public key
    */
@@ -57,7 +56,7 @@ class WalletEntities {
   }
 
   /**
-   * Checks if a xpub is already listed
+   * @description Checks if a xpub is already listed
    * @param {string} xpub
    * @returns {boolean} returns true if the xpub is already listed, false otherwise
    */
@@ -66,7 +65,7 @@ class WalletEntities {
   }
 
   /**
-   * Checks if an address is already listed
+   * @description Checks if an address is already listed
    * @param {string} address - bitcoin address
    * @returns {boolean} returns true if the address is already listed, false otherwise
    */
@@ -75,7 +74,7 @@ class WalletEntities {
   }
 
   /**
-   * Checks if a pubkey is already listed
+   * @description Checks if a pubkey is already listed
    * @param {string} pubkey - public key
    * @returns {boolean} returns true if the pubkey is already listed, false otherwise
    */
@@ -85,4 +84,4 @@ class WalletEntities {
 
 }
 
-module.exports = WalletEntities
\ No newline at end of file
+module.exports = WalletEntities
diff --git a/lib/wallet/wallet-info.js b/lib/wallet/wallet-info.js
index 3d09dfa..160f223 100644
--- a/lib/wallet/wallet-info.js
+++ b/lib/wallet/wallet-info.js
@@ -16,11 +16,13 @@ const AddressInfo = require('./address-info')
 /**
  * A class storing information about a (full|partial) wallet
  * Provides a set of methods allowing to retrieve specific information
+ * @class WalletInfo
  */
 class WalletInfo {
 
   /**
    * Constructor
+   * @constructor
    * @param {object} entities - wallet entities (hdaccounts, addresses, pubkeys)
    */
   constructor(entities) {
@@ -49,7 +51,7 @@ class WalletInfo {
 
   /**
    * Ensure hd accounts exist in database
-   * @returns {Promise}
+   * @returns {Promise<Array<any>>}
    */
   async ensureHdAccounts() {
     return util.parallelCall(this.entities.xpubs, async xpub => {
@@ -60,7 +62,7 @@ class WalletInfo {
 
   /**
    * Load information about the hd accounts
-   * @returns {Promise}
+   * @returns {Promise<Array<any>>}
    */
   async loadHdAccountsInfo() {
     return util.parallelCall(this.entities.xpubs, async xpub => {
@@ -91,7 +93,7 @@ class WalletInfo {
 
   /**
    * Filter addresses that belong to an active hd account
-   * @returns {Promise}
+   * @returns {Promise<void>}
    */
   async filterAddresses() {
     const res = await db.getXpubByAddresses(this.entities.addrs)
@@ -110,7 +112,7 @@ class WalletInfo {
 
   /**
    * Load information about the addresses
-   * @returns {Promise}
+   * @returns {Promise<Array<void>>}
    */
   async loadAddressesInfo() {
     return util.parallelCall(this.entities.addrs, async address => {
@@ -123,11 +125,11 @@ class WalletInfo {
 
   /**
    * Loads a partial list of transactions for this wallet
-   * @param {integer} page - page index
-   * @param {integer} count - number of transactions per page
-   * @param {boolean} txBalance - True if past wallet balance
+   * @param {number} page - page index
+   * @param {number} count - number of transactions per page
+   * @param {boolean=} txBalance - True if past wallet balance
    *    should be computed for each transaction
-   * @returns {Promise}
+   * @returns {Promise<void>}
    */
   async loadTransactions(page, count, txBalance) {
     this.txs = await db.getTxsByAddrAndXpubs(
@@ -149,7 +151,7 @@ class WalletInfo {
 
   /**
    * Loads the number of transactions for this wallet
-   * @returns {Promise}
+   * @returns {Promise<void>}
    */
   async loadNbTransactions() {
     const nbTxs = await db.getAddrAndXpubsNbTransactions(
@@ -163,7 +165,7 @@ class WalletInfo {
 
   /**
    * Loads tinfo about the fee rates
-   * @returns {Promise}
+   * @returns {Promise<void>}
    */
   async loadFeesInfo() {
     this.info.fees = await rpcFees.getFees()
@@ -171,7 +173,7 @@ class WalletInfo {
 
   /**
    * Loads the list of unspent outputs for this wallet
-   * @returns {Promise}
+   * @returns {Promise<void>}
    */
   async loadUtxos() {
     // Load the utxos for the hd accounts
@@ -212,7 +214,7 @@ class WalletInfo {
   /**
    * Post process addresses and public keys
    */
-  postProcessAddresses() {
+  async postProcessAddresses() {
     for (let b = 0; b < this.entities.pubkeys.length; b++) {
       const pk = this.entities.pubkeys[b]
 
@@ -221,7 +223,7 @@ class WalletInfo {
 
         // Add pubkeys in this.addresses
         for (let c = 0; c < this.addresses.length; c++) {
-          if (address == this.addresses[c].address)
+          if (address === this.addresses[c].address)
             this.addresses[c].pubkey = pk
         }
 
@@ -229,30 +231,32 @@ class WalletInfo {
         for (let d = 0; d < this.txs.length; d++) {
           // inputs
           for (let e = 0; e < this.txs[d].inputs.length; e++) {
-            if (address == this.txs[d].inputs[e].prev_out.addr)
+            if (address === this.txs[d].inputs[e].prev_out.addr)
               this.txs[d].inputs[e].prev_out.pubkey = pk
           }
           // outputs
           for (let e = 0; e < this.txs[d].out.length; e++) {
-            if (address == this.txs[d].out[e].addr)
+            if (address === this.txs[d].out[e].addr)
               this.txs[d].out[e].pubkey = pk
           }
         }
 
         // Add pubkeys in this.unspentOutputs
         for (let f = 0; f < this.unspentOutputs.length; f++) {
-          if (address == this.unspentOutputs[f].addr) {
+          if (address === this.unspentOutputs[f].addr) {
             this.unspentOutputs[f].pubkey = pk
           }
         }
       }
     }
+
+    return Promise.resolve()
   }
 
   /**
    * Post process hd accounts (xpubs translations)
    */
-  postProcessHdAccounts() {
+  async postProcessHdAccounts() {
     for (let b = 0; b < this.entities.xpubs.length; b++) {
       const entityXPub = this.entities.xpubs[b]
       const entityYPub = this.entities.ypubs[b]
@@ -263,7 +267,7 @@ class WalletInfo {
 
         // Translate xpub => ypub/zpub in this.addresses
         for (let c = 0; c < this.addresses.length; c++) {
-          if (entityXPub == this.addresses[c].address)
+          if (entityXPub === this.addresses[c].address)
             this.addresses[c].address = tgtXPub
         }
 
@@ -272,14 +276,14 @@ class WalletInfo {
           // inputs
           for (let e = 0; e < this.txs[d].inputs.length; e++) {
             const xpub = this.txs[d].inputs[e].prev_out.xpub
-            if (xpub && (xpub.m == entityXPub))
+            if (xpub && (xpub.m === entityXPub))
               this.txs[d].inputs[e].prev_out.xpub.m = tgtXPub
           }
 
           // outputs
           for (let e = 0; e < this.txs[d].out.length; e++) {
             const xpub = this.txs[d].out[e].xpub
-            if (xpub && (xpub.m == entityXPub))
+            if (xpub && (xpub.m === entityXPub))
               this.txs[d].out[e].xpub.m = tgtXPub
           }
         }
@@ -287,12 +291,14 @@ class WalletInfo {
         // Translate xpub => ypub/zpub in this.unspentOutputs
         for (let f = 0; f < this.unspentOutputs.length; f++) {
           const xpub = this.unspentOutputs[f].xpub
-          if (xpub && (xpub.m == entityXPub)) {
+          if (xpub && (xpub.m === entityXPub)) {
             this.unspentOutputs[f].xpub.m = tgtXPub
           }
         }
       }
     }
+
+    return Promise.resolve()
   }
 
   /**
diff --git a/lib/wallet/wallet-service.js b/lib/wallet/wallet-service.js
index 08cb7ad..97279ac 100644
--- a/lib/wallet/wallet-service.js
+++ b/lib/wallet/wallet-service.js
@@ -72,7 +72,7 @@ class WalletService {
 
       // Force import of addresses associated to paynyms
       // if dojo relies on a local index
-      if (keys.indexer.active != 'third_party_explorer')
+      if (keys.indexer.active !== 'third_party_explorer')
         await this._forceEnsureAddressesForActivePubkeys(active)
 
       // Filter the addresses
@@ -150,7 +150,7 @@ class WalletService {
       await walletInfo.ensureAddresses()
       // Force import of addresses associated to paynyms
       // if dojo relies on a local index
-      if (keys.indexer.active != 'third_party_explorer')
+      if (keys.indexer.active !== 'third_party_explorer')
         await this._forceEnsureAddressesForActivePubkeys(active)
       // Filter the address and load them
       await walletInfo.filterAddresses()
@@ -252,7 +252,7 @@ class WalletService {
       await walletInfo.ensureAddresses()
       // Force import of addresses associated to paynyms
       // if dojo relies on a local index
-      if (keys.indexer.active != 'third_party_explorer')
+      if (keys.indexer.active !== 'third_party_explorer')
         await this._forceEnsureAddressesForActivePubkeys(active)
       // Filter the addresses
       await walletInfo.filterAddresses()
@@ -274,8 +274,8 @@ class WalletService {
   /**
    * Get a subset of wallet transactions
    * @param {object} entities - mapping of active entities
-   * @param {integer} page - page of transactions to be returned
-   * @param {integer} count - number of transactions returned per page
+   * @param {number} page - page of transactions to be returned
+   * @param {number} count - number of transactions returned per page
    * @returns {Promise}
    */
   async getWalletTransactions(entities, page, count) {
@@ -287,7 +287,7 @@ class WalletService {
     }
 
     // Check parameters
-    if (entities.xpubs.length == 0 && entities.addrs.length == 0)
+    if (entities.xpubs.length === 0 && entities.addrs.length === 0)
       return ret
 
     // Initialize a WalletInfo object
@@ -344,13 +344,13 @@ class WalletService {
    * @returns {boolean} return true if conditions are met, false otherwise
    */
   _checkEntities(active, legacy, bip49, bip84, pubkeys) {
-    const allEmpty = active.xpubs.length == 0
-      && active.addrs.length == 0
-      && legacy.xpubs.length == 0
-      && legacy.addrs.length == 0
-      && pubkeys.addrs.length == 0
-      && bip49.xpubs.length == 0
-      && bip84.xpubs.length == 0
+    const allEmpty = active.xpubs.length === 0
+      && active.addrs.length === 0
+      && legacy.xpubs.length === 0
+      && legacy.addrs.length === 0
+      && pubkeys.addrs.length === 0
+      && bip49.xpubs.length === 0
+      && bip84.xpubs.length === 0
 
     return !allEmpty
   }
@@ -375,7 +375,7 @@ class WalletService {
         const pubkey = source.pubkeys[idxSource]
         const idxActive = active.addrs.indexOf(addr)
 
-        if (idxActive == -1) {
+        if (idxActive === -1) {
           active.addrs.push(addr)
           active.pubkeys.push(pubkey)
         } else if (pubkey) {
diff --git a/pushtx/orchestrator.js b/pushtx/orchestrator.js
index 11b9b4b..b00bdf0 100644
--- a/pushtx/orchestrator.js
+++ b/pushtx/orchestrator.js
@@ -94,7 +94,7 @@ class Orchestrator {
           break
 
         for (let tx of txs) {
-          let hasParentTx = (tx.schParentTxid != null) && (tx.schParentTxid != '')
+          let hasParentTx = (tx.schParentTxid != null) && (tx.schParentTxid !== '')
           let parentTx = null
 
           // Check if previous transaction has been confirmed
@@ -158,11 +158,11 @@ class Orchestrator {
   /**
    * Update triggers in chain of transactions
    * following a transaction identified by its txid
-   * @param {integer} parentId - parent id
-   * @param {integer} shift - delta to be added to the triggers
+   * @param {number} parentId - parent id
+   * @param {number} shift - delta to be added to the triggers
    */
   async updateTriggers(parentId, shift) {
-    if (shift == 0)
+    if (shift === 0)
       return
 
     const txs = await db.getNextScheduledTransactions(parentId)
diff --git a/pushtx/pushtx-processor.js b/pushtx/pushtx-processor.js
index 4112a0e..c2934bf 100644
--- a/pushtx/pushtx-processor.js
+++ b/pushtx/pushtx-processor.js
@@ -17,7 +17,7 @@ const keys = require('../keys')[network.key]
 const status = require('./status')
 
 let Sources
-if (network.key == 'bitcoin') {
+if (network.key === 'bitcoin') {
   Sources = require('../lib/remote-importer/sources-mainnet')
 } else {
   Sources = require('../lib/remote-importer/sources-testnet')
@@ -78,7 +78,7 @@ class PushTxProcessor {
     }
     // Checks with indexer if addresses are known and have been used
     if (Object.keys(addrMap).length > 0) {
-      if (keys.indexer.active != 'local_bitcoind') {
+      if (keys.indexer.active !== 'local_bitcoind') {
         const results = await this.sources.getAddresses(Object.keys(addrMap))
         for (let r of results)
           if (r.ntx > 0)
diff --git a/pushtx/pushtx-rest-api.js b/pushtx/pushtx-rest-api.js
index fe257d8..9d94855 100644
--- a/pushtx/pushtx-rest-api.js
+++ b/pushtx/pushtx-rest-api.js
@@ -193,7 +193,7 @@ class PushTxRestApi {
       HttpServer.sendOk(res)
     } catch(e) {
       // Returns code 200 if VIOLATION_STRICT_MODE_VOUTS
-      if (e.message && e.message.code && e.message.code == errors.pushtx.VIOLATION_STRICT_MODE_VOUTS) {
+      if (e.message && e.message.code && e.message.code === errors.pushtx.VIOLATION_STRICT_MODE_VOUTS) {
         e.message = JSON.stringify(e.message)
         this._traceError(res, e, 200)
       } else {
@@ -206,7 +206,7 @@ class PushTxRestApi {
    * Trace an error during push
    * @param {object} res - http response object
    * @param {object} err - error object
-   * @param {int} errorCode - error code (optional)
+   * @param {number} errorCode - error code (optional)
    */
   _traceError(res, err, errorCode) {
     let ret = null
diff --git a/pushtx/transactions-scheduler.js b/pushtx/transactions-scheduler.js
index 00b845c..177d2bf 100644
--- a/pushtx/transactions-scheduler.js
+++ b/pushtx/transactions-scheduler.js
@@ -68,13 +68,13 @@ class TransactionsScheduler {
         // Decode the transaction
         const tx = bitcoin.Transaction.fromHex(entry.tx)
         // Check that nlocktimes are matching
-        if (!(tx.locktime && tx.locktime == entry.nlocktime)) {
+        if (!(tx.locktime && tx.locktime === entry.nlocktime)) {
           const msg = `TransactionsScheduler.schedule() : nLockTime mismatch : ${tx.locktime} - ${entry.nlocktime}`
           Logger.error(null, `PushTx : ${msg}`)
           throw errors.pushtx.NLOCK_MISMATCH
         }
         // Check that order of hop and nlocktime values are consistent
-        if (entry.hop != lastHopProcessed) {
+        if (entry.hop !== lastHopProcessed) {
           if (entry.nlocktime < lastLockTimeProcessed)
             throw errors.pushtx.SCHEDULED_BAD_ORDER
         }
@@ -105,7 +105,7 @@ class TransactionsScheduler {
         lastHopProcessed = entry.hop
         lastLockTimeProcessed = entry.nlocktime
         // Update scheduled height if needed
-        if (baseHeight != nltTx0)
+        if (baseHeight !== nltTx0)
           entry.nlocktime = baseHeight + entry.delta
       }
 
@@ -123,7 +123,7 @@ class TransactionsScheduler {
       let parentNlocktime = baseHeight
 
       // Check if first transactions should be sent immediately
-      while ((script.length > 0) && (script[0].nlocktime <= lastHeight) && (script[0].delta == 0)) {
+      while ((script.length > 0) && (script[0].nlocktime <= lastHeight) && (script[0].delta === 0)) {
         await pushTxProcessor.pushTx(script[0].tx)
         const tx = bitcoin.Transaction.fromHex(script[0].tx)
         parentTxid = tx.getId()
diff --git a/scripts/patches/revert-hd-accounts.js b/scripts/patches/revert-hd-accounts.js
index efdd3de..5016c62 100644
--- a/scripts/patches/revert-hd-accounts.js
+++ b/scripts/patches/revert-hd-accounts.js
@@ -21,9 +21,9 @@ function xlatXPUB(xpub) {
 
   let xlatVer = 0
 
-  if (ver == hdaHelper.MAGIC_XPUB || ver == hdaHelper.MAGIC_YPUB || ver == hdaHelper.MAGIC_ZPUB) {
-    xlatVer = hdaHelper.MAGIC_XPUB    
-  } else if (ver == hdaHelper.MAGIC_TPUB || ver == hdaHelper.MAGIC_UPUB || ver == hdaHelper.MAGIC_VPUB) {
+  if (ver === hdaHelper.MAGIC_XPUB || ver === hdaHelper.MAGIC_YPUB || ver === hdaHelper.MAGIC_ZPUB) {
+    xlatVer = hdaHelper.MAGIC_XPUB
+  } else if (ver === hdaHelper.MAGIC_TPUB || ver === hdaHelper.MAGIC_UPUB || ver === hdaHelper.MAGIC_VPUB) {
     xlatVer = hdaHelper.MAGIC_TPUB
   }
 
@@ -75,8 +75,8 @@ async function run() {
       const xpub = account.hdXpub
       const info = hdaHelper.classify(account.hdType)
       const scheme = info.type
-      
-      if ((scheme == hdaHelper.BIP49) || (scheme == hdaHelper.BIP84)) {
+
+      if ((scheme === hdaHelper.BIP49) || (scheme === hdaHelper.BIP84)) {
         try {
           const xlatedXpub = xlatXPUB(xpub)
           await updateHdAccount(hdId, xlatedXpub)
@@ -90,7 +90,7 @@ async function run() {
   } catch(e) {
     console.log('A problem was met')
     console.log(e)
-  }  
+  }
 }
 
 /**
@@ -102,4 +102,4 @@ const startupTimeout = setTimeout(async function() {
   return run().then(() => {
     console.log('Process completed')
   })
-}, 1500)
\ No newline at end of file
+}, 1500)
diff --git a/scripts/patches/translate-hd-accounts.js b/scripts/patches/translate-hd-accounts.js
index b1891c2..6a05baa 100644
--- a/scripts/patches/translate-hd-accounts.js
+++ b/scripts/patches/translate-hd-accounts.js
@@ -21,18 +21,18 @@ function xlatXPUB(xpub, targetType) {
 
   let xlatVer = 0
 
-  if (ver == hdaHelper.MAGIC_XPUB) {
+  if (ver === hdaHelper.MAGIC_XPUB) {
 
-    if (targetType == hdaHelper.BIP49)
+    if (targetType === hdaHelper.BIP49)
       xlatVer = hdaHelper.MAGIC_YPUB
-    else if (targetType == hdaHelper.BIP84)
+    else if (targetType === hdaHelper.BIP84)
       xlatVer = hdaHelper.MAGIC_ZPUB
 
-  } else if (ver == hdaHelper.MAGIC_TPUB) {
+  } else if (ver === hdaHelper.MAGIC_TPUB) {
 
-    if (targetType == hdaHelper.BIP49)
+    if (targetType === hdaHelper.BIP49)
       xlatVer = hdaHelper.MAGIC_UPUB
-    else if (targetType == hdaHelper.BIP84)
+    else if (targetType === hdaHelper.BIP84)
       xlatVer = hdaHelper.MAGIC_VPUB
   }
 
@@ -84,8 +84,8 @@ async function run() {
       const xpub = account.hdXpub
       const info = hdaHelper.classify(account.hdType)
       const scheme = info.type
-      
-      if ((scheme == hdaHelper.BIP49) || (scheme == hdaHelper.BIP84)) {
+
+      if ((scheme === hdaHelper.BIP49) || (scheme === hdaHelper.BIP84)) {
         const xlatedXpub = xlatXPUB(xpub, scheme)
         await updateHdAccount(hdId, xlatedXpub)
         console.log(`Updated ${hdId} (${xpub} => ${xlatedXpub})`)
@@ -94,7 +94,7 @@ async function run() {
   } catch(e) {
     console.log('A problem was met')
     console.log(e)
-  }  
+  }
 }
 
 /**
@@ -106,4 +106,4 @@ const startupTimeout = setTimeout(async function() {
   return run().then(() => {
     console.log('Process completed')
   })
-}, 1500)
\ No newline at end of file
+}, 1500)
diff --git a/static/admin/dmt/index.js b/static/admin/dmt/index.js
index a0396e9..2bd846d 100644
--- a/static/admin/dmt/index.js
+++ b/static/admin/dmt/index.js
@@ -84,7 +84,7 @@ function preparePage() {
   const activeTab = sessionStorage.getItem('activeTab')
   for (let idxTab in tabs) {
     const screen = screens[idxTab]
-    if (tabs[idxTab] == activeTab) {
+    if (tabs[idxTab] === activeTab) {
       $(screen).show()
       if (screenScripts.has(screen))
         screenScripts.get(screen).preparePage()
diff --git a/static/admin/dmt/status/status.js b/static/admin/dmt/status/status.js
index 1075172..3e93550 100644
--- a/static/admin/dmt/status/status.js
+++ b/static/admin/dmt/status/status.js
@@ -95,7 +95,7 @@ const statusScript = {
         this.chaintipBitcoind = data['bitcoind']['blocks']
         $('#node-chaintip').text(data['bitcoind']['blocks'])
         $('#node-version').text(data['bitcoind']['version'])
-        const network = data['bitcoind']['testnet'] == true ? 'testnet' : 'mainnet'
+        const network = data['bitcoind']['testnet'] === true ? 'testnet' : 'mainnet'
         $('#node-network').text(network)
         $('#node-conn').text(data['bitcoind']['conn'])
         $('#node-relay-fee').text(data['bitcoind']['relayfee'])
@@ -123,13 +123,13 @@ const statusScript = {
   },
 
   setStatusIndicator: function(id, status) {
-    if (status == 'ok') {
+    if (status === 'ok') {
       $(id).html('&#10003;')
       $(id).css('color', '#76d776')
-    } else if (status == 'ko') {
+    } else if (status === 'ko') {
       $(id).html('X')
       $(id).css('color', '#f77c7c')
-    } else if (status == 'desynchronized') {
+    } else if (status === 'desynchronized') {
       $(id).html('&#10003;')
       $(id).css('color', '#f0c649')
     } else {
@@ -140,4 +140,4 @@ const statusScript = {
 
 }
 
-screenScripts.set('#screen-status', statusScript)
\ No newline at end of file
+screenScripts.set('#screen-status', statusScript)
diff --git a/static/admin/dmt/xpubs-tools/xpubs-tools.js b/static/admin/dmt/xpubs-tools/xpubs-tools.js
index 20d93cc..5ad5ec8 100644
--- a/static/admin/dmt/xpubs-tools/xpubs-tools.js
+++ b/static/admin/dmt/xpubs-tools/xpubs-tools.js
@@ -31,8 +31,8 @@ const screenXpubsToolsScript = {
 
   preparePage: function() {
     // Disable custom lookahead if data source is a third party explorer
-    const isTPE = sessionStorage.getItem('indexerType') == 'third_party_explorer'
-    const isLRI = sessionStorage.getItem('indexerType') == 'local_rest_indexer'
+    const isTPE = sessionStorage.getItem('indexerType') === 'third_party_explorer'
+    const isLRI = sessionStorage.getItem('indexerType') === 'local_rest_indexer'
     const disableLookahead = isTPE || isLRI
     $('#rescan-lookahead').prop('disabled', disableLookahead)
 
@@ -99,9 +99,9 @@ const screenXpubsToolsScript = {
     }
 
     const derivType = $('#import-deriv-type').val()
-    if (derivType == 'bip49' || derivType == 'bip84') {
+    if (derivType === 'bip49' || derivType === 'bip84') {
       jsonData['segwit'] = derivType
-    } else if (derivType == 'auto') {
+    } else if (derivType === 'auto') {
       if (this.currentXpub.startsWith('ypub'))
         jsonData['segwit'] = 'bip49'
       else if (this.currentXpub.startsWith('zpub'))
diff --git a/static/admin/lib/auth-utils.js b/static/admin/lib/auth-utils.js
index e17557b..bb894ea 100644
--- a/static/admin/lib/auth-utils.js
+++ b/static/admin/lib/auth-utils.js
@@ -98,7 +98,7 @@ const lib_auth = {
   isAuthenticated: function() {
     // Checks that an access token is stored in session storage
     let token = this.getAccessToken()
-    return (token && (token != 'null')) ? true : false
+    return Boolean(token && (token !== 'null'))
   },
 
   /*
@@ -128,7 +128,7 @@ const lib_auth = {
     const payload = this.getPayloadAccessToken(token)
     if (!payload)
       return false
-    return (('prf' in payload) && (payload['prf'] == this.TOKEN_PROFILE_ADMIN))
+    return (('prf' in payload) && (payload['prf'] === this.TOKEN_PROFILE_ADMIN))
   },
 
   /*
diff --git a/static/admin/lib/common-script.js b/static/admin/lib/common-script.js
index 127884c..8f66b92 100644
--- a/static/admin/lib/common-script.js
+++ b/static/admin/lib/common-script.js
@@ -27,9 +27,9 @@ const lib_cmn = {
   getExplorerTxUrl: function(txid, explorerInfo) {
     if (explorerInfo == null)
       return null
-    else if (explorerInfo['pairing']['type'] == 'explorer.oxt')
+    else if (explorerInfo['pairing']['type'] === 'explorer.oxt')
       return `${explorerInfo['pairing']['url']}/transaction/${txid}`
-    else if (explorerInfo['pairing']['type'] == 'explorer.btc_rpc_explorer')
+    else if (explorerInfo['pairing']['type'] === 'explorer.btc_rpc_explorer')
       return `http://${explorerInfo['pairing']['url']}/tx/${txid}`
     else
       return null
@@ -46,7 +46,7 @@ const lib_cmn = {
       if (file) {
         xhttp = new XMLHttpRequest()
         xhttp.onreadystatechange = function() {
-          if (this.readyState == 4 && this.status == 200) {
+          if (this.readyState === 4 && this.status === 200) {
             elmnt.innerHTML = this.responseText
             elmnt.removeAttribute('include-html')
             self.includeHTML(cb)
@@ -72,7 +72,7 @@ const lib_cmn = {
       if (file) {
         xhttp = new XMLHttpRequest()
         xhttp.onreadystatechange = function() {
-          if (this.readyState == 4 && this.status == 200) {
+          if (this.readyState === 4 && this.status === 200) {
             const newElmnt = document.createElement('script')
             newElmnt.textContent = this.responseText
             if (elmnt.parentNode) {
diff --git a/static/admin/lib/errors-utils.js b/static/admin/lib/errors-utils.js
index 106cd16..b4c7e47 100644
--- a/static/admin/lib/errors-utils.js
+++ b/static/admin/lib/errors-utils.js
@@ -14,7 +14,7 @@ const lib_errors = {
   processError: function(e) {
     const errorMsg = this.extractJqxhrErrorMsg(e)
     // Redirect to sign in page if authentication error
-    if (errorMsg == 'Invalid JSON Web Token' || errorMsg == 'Missing JSON Web Token') {
+    if (errorMsg === 'Invalid JSON Web Token' || errorMsg === 'Missing JSON Web Token') {
       lib_auth.logout()
     } else {
       lib_msg.displayErrors(errorMsg)
diff --git a/static/admin/lib/format-utils.js b/static/admin/lib/format-utils.js
index 96cd07c..65683fd 100644
--- a/static/admin/lib/format-utils.js
+++ b/static/admin/lib/format-utils.js
@@ -52,7 +52,7 @@ const lib_fmt = {
    * Format a unix timestamp into a readable date/hour
    */
   formatUnixTs: function(ts) {
-    if (ts == null || ts == 0)
+    if (ts == null || ts === 0)
       return '-'
 
     let tmpDate = new Date(ts*1000),
diff --git a/tracker/block-worker.js b/tracker/block-worker.js
index f19a2ef..0262f28 100644
--- a/tracker/block-worker.js
+++ b/tracker/block-worker.js
@@ -61,22 +61,22 @@ async function processMessage(msg) {
   try {
     switch(msg.op) {
       case OP_INIT:
-        if (status != IDLE)
+        if (status !== IDLE)
           throw 'Operation not allowed'
         res = await initBlock(msg.header)
         break
       case OP_PROCESS_OUTPUTS:
-        if (status != INITIALIZED)
+        if (status !== INITIALIZED)
           throw 'Operation not allowed'
         res = await processOutputs()
         break
       case OP_PROCESS_INPUTS:
-        if (status != OUTPUTS_PROCESSED)
+        if (status !== OUTPUTS_PROCESSED)
           throw 'Operation not allowed'
         res = await processInputs()
         break
       case OP_CONFIRM:
-        if (status != INPUTS_PROCESSED)
+        if (status !== INPUTS_PROCESSED)
           throw 'Operation not allowed'
         res = await confirmTransactions(msg.blockId)
         break
@@ -130,7 +130,7 @@ async function processInputs() {
 
 /**
  * Confirm the transactions
- * @param {integer} blockId - id of the block in db
+ * @param {number} blockId - id of the block in db
  */
 async function confirmTransactions(blockId) {
   status = TXS_CONFIRMED
diff --git a/tracker/block.js b/tracker/block.js
index 55161e2..fe6fc55 100644
--- a/tracker/block.js
+++ b/tracker/block.js
@@ -44,7 +44,7 @@ class Block extends TransactionsBundle {
    * @dev This method isn't used anymore.
    *      It has been replaced by a parallel processing of blocks.
    *      (see blocks-processor and block-worker)
-   * @returns {Promise - object[]} returns an array of transactions to be broadcast
+   * @returns {Promise<object[]>} returns an array of transactions to be broadcast
    */
   async processBlock() {
     Logger.info('Tracker : Beginning to process new block.')
@@ -77,7 +77,7 @@ class Block extends TransactionsBundle {
 
   /**
    * Process the transaction outputs
-   * @returns {Promise - object[]} returns an array of transactions to be broadcast
+   * @returns {Promise<object[]>} returns an array of transactions to be broadcast
    */
   async processOutputs() {
     const txsForBroadcast = new Set()
@@ -93,7 +93,7 @@ class Block extends TransactionsBundle {
 
   /**
    * Process the transaction inputs
-   * @returns {Promise - object[]} returns an array of transactions to be broadcast
+   * @returns {Promise<object[]>} returns an array of transactions to be broadcast
    */
   async processInputs() {
     const txsForBroadcast = new Set()
@@ -109,7 +109,7 @@ class Block extends TransactionsBundle {
 
   /**
    * Store the block in db
-   * @returns {Promise - int} returns the id of the block
+   * @returns {Promise<number>} returns the id of the block
    */
   async registerBlock() {
     const prevBlock = await db.getBlockByHash(this.header.previousblockhash)
@@ -130,8 +130,8 @@ class Block extends TransactionsBundle {
   /**
    * Confirm the transactions in db
    * @param {Set} txs - set of transactions stored in db
-   * @param {int} blockId - id of the block
-   * r@returns {Promise}
+   * @param {number} blockId - id of the block
+   * @returns {Promise}
    */
   async confirmTransactions(txs, blockId) {
     const txids = txs.map(t => t.getId())
@@ -141,8 +141,8 @@ class Block extends TransactionsBundle {
 
   /**
    * Register the block header
-   * @param {int} prevBlockID - id of previous block
-   * @returns {Promise}
+   * @param {number} prevBlockID - id of previous block
+   * @returns {Promise<number>}
    */
   async checkBlockHeader(prevBlockID) {
     Logger.info('Tracker : Beginning to process new block header.')
diff --git a/tracker/blockchain-processor.js b/tracker/blockchain-processor.js
index 06aff7f..bc88875 100644
--- a/tracker/blockchain-processor.js
+++ b/tracker/blockchain-processor.js
@@ -43,7 +43,7 @@ class BlockchainProcessor {
 
   /**
    * Start processing the blockchain
-   * @returns {Promise}
+   * @returns {Promise<void>}
    */
   async start() {
     await this.catchup()
@@ -57,7 +57,7 @@ class BlockchainProcessor {
 
   /**
    * Tracker process startup
-   * @returns {Promise}
+   * @returns {Promise<void>}
    */
   async catchup() {
     const [highest, info] = await Promise.all([db.getHighestBlock(), this.client.getblockchaininfo()])
@@ -78,7 +78,7 @@ class BlockchainProcessor {
    * 2. Pull all block headers after database last known height
    * 3. Process those block headers
    *
-   * @returns {Promise}
+   * @returns {Promise<void>}
    */
   async catchupIBDMode() {
     try {
@@ -93,7 +93,7 @@ class BlockchainProcessor {
       let prevBlockId = highest.blockID
 
       // If no header or block loaded by bitcoind => try later
-      if (daemonNbHeaders == 0 || daemonNbBlocks == 0) {
+      if (daemonNbHeaders === 0 || daemonNbBlocks === 0) {
         Logger.info('Tracker : New attempt scheduled in 30s (waiting for block headers)')
         return util.delay(30000).then(() => {
           return this.catchupIBDMode()
@@ -148,7 +148,7 @@ class BlockchainProcessor {
    * 2. Pull all block headers after database last known height
    * 3. Process those block headers
    *
-   * @returns {Promise}
+   * @returns {Promise<void>}
    */
   async catchupNormalMode() {
     try {
@@ -159,7 +159,7 @@ class BlockchainProcessor {
       const daemonNbBlocks = info.blocks
 
       if (highest == null) return null
-      if (daemonNbBlocks == highest.blockHeight) return null
+      if (daemonNbBlocks === highest.blockHeight) return null
 
       const blockRange = _.range(highest.blockHeight, daemonNbBlocks + 1)
 
@@ -225,7 +225,7 @@ class BlockchainProcessor {
    * block confirmation.
    *
    * @param {Buffer} buf - block
-   * @returns {Promise}
+   * @returns {Promise<void>}
    */
   async onBlockHash(buf) {
     try {
@@ -298,8 +298,8 @@ class BlockchainProcessor {
   /**
    * Cancel confirmation of transactions
    * and delete blocks after a given height
-   * @param {integer} height - height of last block maintained
-   * @returns {Promise}
+   * @param {number} height - height of last block maintained
+   * @returns {Promise<void>}
    */
   async rewind(height) {
     // Retrieve transactions confirmed in reorg'd blocks
@@ -317,8 +317,8 @@ class BlockchainProcessor {
 
   /**
    * Rescan a range of blocks
-   * @param {integer} fromHeight - height of first block
-   * @param {integer} toHeight - height of last block
+   * @param {number} fromHeight - height of first block
+   * @param {number} toHeight - height of last block
    * @returns {Promise}
    */
   async rescanBlocks(fromHeight, toHeight) {
@@ -356,7 +356,7 @@ class BlockchainProcessor {
 
   /**
    * Process a range of blocks
-   * @param {int[]} heights - a range of block heights
+   * @param {number[]} heights - a range of block heights
    */
   async processBlockRange(heights) {
     const chunks = util.splitList(heights, blocksProcessor.nbWorkers)
@@ -373,7 +373,7 @@ class BlockchainProcessor {
   /**
    * Process a block header
    * @param {object} header - block header
-   * @param {int} prevBlockID - id of previous block
+   * @param {number} prevBlockID - id of previous block
    * @returns {Promise}
    */
   async processBlockHeader(header, prevBlockID) {
diff --git a/tracker/blocks-processor.js b/tracker/blocks-processor.js
index 11f2443..502f65c 100644
--- a/tracker/blocks-processor.js
+++ b/tracker/blocks-processor.js
@@ -90,11 +90,11 @@ async function processWorkerMessage(msg) {
 
   if (!msg.status) {
     Logger.error(msg.res, 'Tracker : processWorkerMessage()')
-  } else if (msg.op == blockWorker.OP_CONFIRM) {
+  } else if (msg.op === blockWorker.OP_CONFIRM) {
     txsForBroadcast = txsForBroadcast.concat(msg.res)
   }
 
-  if (nbTasksCompleted == nbTasksEnqueued) {
+  if (nbTasksCompleted === nbTasksEnqueued) {
     switch (msg.op) {
       case blockWorker.OP_INIT:
         // Process the transaction outputs
@@ -139,7 +139,7 @@ async function processWorkerMessage(msg) {
 
 /**
  * Execute an operation processing a block
- * @param {integer} op - operation
+ * @param {number} op - operation
  * @param {*} args
  */
 function processTask(op, args) {
@@ -204,7 +204,7 @@ function notifyBlock(header) {
 /**
  * Store a block in db
  * @param {object} header - block header
- * @returns {Promise - int} returns the id of the block
+ * @returns {Promise<number>} returns the id of the block
  */
 async function registerBlock(header) {
   const prevBlock = await dbProcessor.getBlockByHash(header.previousblockhash)
diff --git a/tracker/mempool-processor.js b/tracker/mempool-processor.js
index c913ff7..7100ad2 100644
--- a/tracker/mempool-processor.js
+++ b/tracker/mempool-processor.js
@@ -47,7 +47,7 @@ class MempoolProcessor {
 
   /**
    * Start processing the mempool
-   * @returns {Promise}
+   * @returns {Promise<void>}
    */
   async start() {
     this.checkUnconfirmedId = setInterval(
@@ -143,7 +143,7 @@ class MempoolProcessor {
 
   /**
    * Process transactions from the mempool buffer
-   * @returns {Promise}
+   * @returns {Promise<void>}
    */
   async processMempool() {
     // Refresh the isActive flag
@@ -181,7 +181,7 @@ class MempoolProcessor {
   /**
    * On reception of a new transaction from bitcoind mempool
    * @param {Buffer} buf - transaction
-   * @returns {Promise}
+   * @returns {Promise<void>}
    */
   async onTx(buf) {
     if (this.isActive) {
@@ -201,7 +201,7 @@ class MempoolProcessor {
   /**
    * On reception of a new transaction from /pushtx
    * @param {Buffer} buf - transaction
-   * @returns {Promise}
+   * @returns {Promise<void>}
    */
   async onPushTx(buf) {
     try {
@@ -249,7 +249,7 @@ class MempoolProcessor {
 
   /**
    * Check unconfirmed transactions
-   * @returns {Promise}
+   * @returns {Promise<void>}
    */
   async checkUnconfirmed() {
     const t0 = Date.now()
@@ -287,12 +287,13 @@ class MempoolProcessor {
     // Logs
     const ntx = unconfirmedTxs.length
     const dt = ((Date.now() - t0) / 1000).toFixed(1)
-    const per = (ntx == 0) ? 0 : ((Date.now() - t0) / ntx).toFixed(0)
+    const per = (ntx === 0) ? 0 : ((Date.now() - t0) / ntx).toFixed(0)
     Logger.info(`Tracker : Finished processing unconfirmed transactions ${dt}s, ${ntx} tx, ${per}ms/tx`)
   }
 
   /**
    * Sets the isActive flag
+   * @private
    */
   async _refreshActiveStatus() {
     // Get highest header in the blockchain
@@ -300,7 +301,7 @@ class MempoolProcessor {
     const [highestBlock, info] = await Promise.all([db.getHighestBlock(), this.client.getblockchaininfo()])
     const highestHeader = info.headers
 
-    if (highestBlock == null || highestBlock.blockHeight == 0) {
+    if (highestBlock == null || highestBlock.blockHeight === 0) {
       this.isActive = false
       return
     }
diff --git a/tracker/tracker.js b/tracker/tracker.js
index 4c48bf3..556d2a7 100644
--- a/tracker/tracker.js
+++ b/tracker/tracker.js
@@ -34,7 +34,7 @@ class Tracker {
 
   /**
    * Start the tracker
-   * @returns {Promise}
+   * @returns {Promise<void>}
    */
   async start() {
     if (!this.initialized) {
diff --git a/tracker/transaction.js b/tracker/transaction.js
index 037e774..7bf1f69 100644
--- a/tracker/transaction.js
+++ b/tracker/transaction.js
@@ -96,7 +96,7 @@ class Transaction {
     // Check if we find some inputs of interest
     const results = await db.getOutputSpends(spends)
 
-    if (results.length == 0)
+    if (results.length === 0)
       return null
 
     // Flag the transaction for broadcast
@@ -122,7 +122,7 @@ class Transaction {
       })
 
       // Detect potential double spends
-      if (r.spendingTxnID !== null && r.spendingTxnID != this.storedTxnID) {
+      if (r.spendingTxnID !== null && r.spendingTxnID !== this.storedTxnID) {
         Logger.info(`Tracker : DOUBLE SPEND of ${r.txnTxid}-${r.outIndex} by ${this.txid}!`)
         // Delete the existing transaction that has been double-spent:
         // since the deepest block keeps its transactions, this will
@@ -190,7 +190,7 @@ class Transaction {
     const aHdAcctAddr = await this._processOutputsHdAccounts(result.hd, indexedOutputs)
     fundedAddresses = fundedAddresses.concat(aHdAcctAddr)
 
-    if (fundedAddresses.length == 0)
+    if (fundedAddresses.length === 0)
       return null
 
     // Flag the transaction for broadcast
@@ -219,7 +219,7 @@ class Transaction {
    * Process outputs sending to tracked loose addresses
    * @param {object[]} addresses - array of address objects
    * @param {object} indexedOutputs - outputs indexed by address
-   * @returns {Promise - object[]} return an array of funded addresses
+   * @returns {Promise<object[]>} return an array of funded addresses
    *  {addrID: ..., outIndex: ..., outAmount: ..., outScript: ...}
    */
   async _processOutputsLooseAddresses(addresses, indexedOutputs) {
@@ -247,7 +247,7 @@ class Transaction {
    * Process outputs sending to tracked hd accounts
    * @param {object[]} hdAccounts - array of hd account objects
    * @param {object} indexedOutputs - outputs indexed by address
-   * @returns {Promise - object[]} return an array of funded addresses
+   * @returns {Promise<object[]>} return an array of funded addresses
    *  {addrID: ..., outIndex: ..., outAmount: ..., outScript: ...}
    */
   async _processOutputsHdAccounts(hdAccounts, indexedOutputs) {
@@ -297,7 +297,7 @@ class Transaction {
    * @param {string} xpub
    * @param {object} hdAccount - hd account object
    * @param {object} indexedOutputs - outputs indexed by address
-   * @returns {Promise - object[]} returns an array of the new addresses used
+   * @returns {Promise<object[]>} returns an array of the new addresses used
    */
   async _deriveNewAddresses(xpub, hdAccount, indexedOutputs) {
     const hdType = hdAccount.hdType
@@ -317,10 +317,10 @@ class Transaction {
     for (let chain of [0,1]) {
       // Get addresses for this account that are on this chain
       const chainAddresses = _.filter(hdAccount.addresses, v => {
-        return v.hdAddrChain == chain
+        return v.hdAddrChain === chain
       })
 
-      if (chainAddresses.length == 0)
+      if (chainAddresses.length === 0)
         continue
 
       // Get the maximum used address on this chain
diff --git a/tracker/transactions-bundle.js b/tracker/transactions-bundle.js
index 9f2a87a..8084fc5 100644
--- a/tracker/transactions-bundle.js
+++ b/tracker/transactions-bundle.js
@@ -18,7 +18,8 @@ class TransactionsBundle {
 
   /**
    * Constructor
-   * @param {object[]} txs - array of bitcoin transaction objects
+   * @constructor
+   * @param {object[]=} txs - array of bitcoin transaction objects
    */
   constructor(txs) {
     // List of transactions
@@ -52,7 +53,7 @@ class TransactionsBundle {
 
   /**
    * Get the size of the bundle
-   * @returns {integer} return the number of transactions stored in the bundle
+   * @returns {number} return the number of transactions stored in the bundle
    */
   size() {
     return this.transactions.length
@@ -61,7 +62,7 @@ class TransactionsBundle {
   /**
    * Find the transactions of interest
    * based on theirs inputs
-   * @returns {object[]} returns an array of transactions objects
+   * @returns {Promise<object[]>} returns an array of transactions objects
    */
   async prefilterByInputs() {
     // Process transactions by slices of 5000 transactions
@@ -74,7 +75,7 @@ class TransactionsBundle {
   /**
    * Find the transactions of interest
    * based on theirs outputs
-   * @returns {object[]} returns an array of transactions objects
+   * @returns {Promise<object[]>} returns an array of transactions objects
    */
   async prefilterByOutputs() {
     // Process transactions by slices of 5000 transactions
@@ -88,7 +89,7 @@ class TransactionsBundle {
    * Find the transactions of interest
    * based on theirs outputs (internal implementation)
    * @params {object[]} txs - array of transactions objects
-   * @returns {object[]} returns an array of transactions objects
+   * @returns {Promise<object[]>} returns an array of transactions objects
    */
   async _prefilterByOutputs(txs) {
     let addresses = []
@@ -122,7 +123,7 @@ class TransactionsBundle {
       const idxTxs = indexedOutputs[key]
       if (idxTxs) {
         for (const idxTx of idxTxs)
-          if (filteredIdxTxs.indexOf(idxTx) == -1)
+          if (filteredIdxTxs.indexOf(idxTx) === -1)
             filteredIdxTxs.push(idxTx)
       }
     }
@@ -134,7 +135,7 @@ class TransactionsBundle {
    * Find the transactions of interest
    * based on theirs inputs (internal implementation)
    * @params {object[]} txs - array of transactions objects
-   * @returns {object[]} returns an array of transactions objects
+   * @returns {Promise<object[]>} returns an array of transactions objects
    */
   async _prefilterByInputs(txs) {
     let inputs = []
@@ -169,7 +170,7 @@ class TransactionsBundle {
       const idxTxs = indexedInputs[key]
       if (idxTxs) {
         for (const idxTx of idxTxs)
-          if (filteredIdxTxs.indexOf(idxTx) == -1)
+          if (filteredIdxTxs.indexOf(idxTx) === -1)
             filteredIdxTxs.push(idxTx)
       }
     }