bitcore-wallet-service

A Multisig HD Bitcore Wallet Service.

Description

Bitcore Wallet Service facilitates multisig HD wallets creation and operation thru a (hopefully) simple and intuitive REST API.

BWS can usually be installed within minutes and accommodates all the needed infrastructure for peers in a multisig wallet to communicate and operate – with minimum server trust.

See [Bitcore-wallet-client] (https://github.com/bitpay/bitcore-wallet-client) for the official client library that communicates to BWS and verifies its response. Also check [Bitcore-wallet] (https://github.com/bitpay/bitcore-wallet) for a simple CLI wallet implementation that relays on BWS.

BWS have a extensive test suite but have not been tested on production environments yet and have been recently released, so it it is still should be considered BETA software.

More about BWS at http://blog.bitpay.com/2015/03/05/bitcore-wallet.html

Install

 npm install bws
 npm start

BWS needs mongoDB. You can configure the connection at config.js

BWS supports SSL and Clustering. To configure them see config.js.

To use clustering, an external DB server and Lock server need to be configured. The lock server can be started locker/locker.js.

Migration from LevelDB

Old versions of BWS uses LevelDB to store data. There is a migration script available at: scripts/level2mongo.js

Security Considerations

• Private keys are never sent to BWS. Copayers store them locally.
• Extended public keys are stored on BWS. This allows BWS to easily check wallet balance, send offline notifications to copayers, etc.
• During wallet creation, the initial copayer creates a wallet secret that contains a private key. All copayers need to prove they have the secret by signing their information with this private key when joining the wallet. The secret should be shared using secured channels.
• A copayer could join the wallet more than once, and there is no mechanism to prevent this. See [wallet]((https://github.com/bitpay/bitcore-wallet)'s confirm command, for a method for confirming copayers.
• All BWS responses are verified:
• Addresses and change addresses are derived independently and locally by the copayers from their local data.
• TX Proposals templates are signed by copayers and verified by others, so the BWS cannot create or tamper with them.

REST API

Authentication

In order to access a wallet, clients are required to send the headers:

  x-identity
  x-signature

Identity is the Peer-ID, this will identify the peer and its wallet. Signature is the current request signature, using requestSigningKey, the m/1/1 derivative of the Extended Private Key.

See Bitcore Wallet Client for implementation details.

GET Endpoints

/v1/wallets/: Get wallet information

Returns:

• Wallet object. (see fields on the source code).

/v1/txhistory/: Get Wallet's transaction history

Optional Arguments:

• skip: Records to skip from the result (defaults to 0)
• limit: Total number of records to return (return all available records if not specified).

Returns:

• History of incoming and outgoing transactions of the wallet. The list is paginated using the skip & limit params. Each item has the following fields:
• action ('sent', 'received', 'moved')
• amount
• fees
• time
• addressTo
• confirmations
• proposalId
• creatorName
• message
• actions array ['createdOn', 'type', 'copayerId', 'copayerName', 'comment']

/v1/txproposals/: Get Wallet's pending transaction proposals and their status Returns:

• List of pending TX Proposals. (see fields on the source code)

/v1/addresses/: Get Wallet's main addresses (does not include change addresses)

Returns:

• List of Addresses object: (https://github.com/bitpay/bitcore-wallet-service/blob/master/lib/model/adddress.js)). This call is mainly provided so the client check this addresses for incoming transactions (using a service like Insight

/v1/balance/: Get Wallet's balance

Returns:

• totalAmount: Wallet's total balance
• lockedAmount: Current balance of outstanding transaction proposals, that cannot be used on new transactions.
• byAddress array ['address', 'path', 'amount']: A list of addresses holding funds.

POST Endpoints

/v1/wallets/: Create a new Wallet

Required Arguments:

• name: Name of the wallet
• m: Number of required peers to sign transactions
• n: Number of total peers on the wallet
• pubKey: Wallet Creation Public key to check joining copayer's signatures (the private key is unknown by BWS and must be communicated by the creator peer to other peers).

Returns:

• walletId: Id of the new created wallet

/v1/wallets/:id/copayers/: Join a Wallet in creation Required Arguments:

• walletId: Id of the wallet to join
• name: Copayer Name
• xPubKey - Extended Public Key for this copayer.
• requestPubKey - Public Key used to check requests from this copayer.
• copayerSignature - Signature used by other copayers to verify that the copayer joining knows the wallet secret.

Returns:

• copayerId: Assigned ID of the copayer (to be used on x-identity header)
• wallet: Object with wallet's information

/v1/txproposals/: Add a new transaction proposal Required Arguments:

• toAddress: RCPT Bitcoin address
• amount: amount (in satoshis) of the mount proposed to be transfered
• proposalsSignature: Signature of the proposal by the creator peer, using prososalSigningKey.
• (opt) message: Encrypted private message to peers

Returns:

• TX Proposal object. (see fields on the source code). .id is probably needed in this case.

/v1/addresses/: Request a new main address from wallet

Returns:

• Address object: (https://github.com/bitpay/bitcore-wallet-service/blob/master/lib/model/adddress.js)). Note that path is returned so client can derive the address independently and check server's response.

/v1/txproposals/:id/signatures/: Sign a transaction proposal

Required Arguments:

• signatures: All Transaction's input signatures, in order of appearance.

Returns:

• TX Proposal object. (see fields on the source code). .status is probably needed in this case.

/v1/txproposals/:id/broadcast/: Broadcast a transaction proposal

Returns:

• TX Proposal object. (see fields on the source code). .status is probably needed in this case.

/v1/txproposals/:id/rejections: Reject a transaction proposal

Returns:

• TX Proposal object. (see fields on the source code). .status is probably needed in this case.

/v1/addresses/scan: Start an address scan process looking for activity.

Optional Arguments:

• includeCopayerBranches: Scan all copayer branches following BIP45 recommendation (defaults to false).

DELETE Endpoints

/v1/txproposals/:id/: Deletes a transaction proposal. Only the creator can delete a TX Proposal, and only if it has no other signatures or rejections

Returns:

• TX Proposal object. (see fields on the source code). .id is probably needed in this case.

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