diff --git a/src/hdwallet.js b/src/hdwallet.js
index 68836dd..2d286f9 100644
--- a/src/hdwallet.js
+++ b/src/hdwallet.js
@@ -13,7 +13,7 @@ var HDWallet = module.exports = function(seed, network) {
 
     var I = Crypto.HMAC(Crypto.SHA512, seed, 'Bitcoin seed', { asBytes: true })
     this.chaincode = I.slice(32)
-    this.network = network || 'Bitcoin'
+    this.network = network || 'prod'
     this.priv = new ECKey(I.slice(0, 32).concat([1]), true, this.getKeyVersion())
     this.pub = this.priv.getPub()
     this.index = 0
@@ -24,8 +24,8 @@ HDWallet.HIGHEST_BIT = 0x80000000
 HDWallet.LENGTH = 78
 
 HDWallet.VERSIONS = {
-    Bitcoin: [0x0488B21E, 0x0488ADE4],
-    BitcoinTest: [0x043587CF, 0x04358394]
+    prod: [0x0488B21E, 0x0488ADE4],
+    testnet: [0x043587CF, 0x04358394]
 }
 
 function arrayEqual(a, b) {
@@ -124,8 +124,7 @@ HDWallet.prototype.getFingerprint = function() {
 }
 
 HDWallet.prototype.getBitcoinAddress = function() {
-    var test = this.network.match(/Test$/)
-    return new Address(util.sha256ripe160(this.pub.toBytes()), test ? 111 : 0)
+    return new Address(util.sha256ripe160(this.pub.toBytes()), this.getKeyVersion())
 }
 
 HDWallet.prototype.toBytes = function(priv) {
@@ -234,7 +233,7 @@ HDWallet.prototype.derivePrivate = function(index) {
 }
 
 HDWallet.prototype.getKeyVersion = function() {
-    return this.network == 'Bitcoin' ? Address.address_types.prod : Address.address_types.testnet
+    return this.network == 'prod' ? Address.address_types.prod : Address.address_types.testnet
 }
 
 HDWallet.prototype.toString = HDWallet.prototype.toBase58
diff --git a/src/wallet.js b/src/wallet.js
index 95f2e91..ead9af6 100644
--- a/src/wallet.js
+++ b/src/wallet.js
@@ -18,7 +18,7 @@ var Wallet = function (seed, options) {
     if (!(this instanceof Wallet)) { return new Wallet(seed, options); }
 
     var options = options || {}
-    var network = options.network || 'Bitcoin'
+    var network = options.network || 'prod'
 
     // HD first-level child derivation method (i.e. public or private child key derivation)
     // NB: if not specified, defaults to private child derivation
diff --git a/test/wallet.js b/test/wallet.js
index 44f6164..45ef084 100644
--- a/test/wallet.js
+++ b/test/wallet.js
@@ -11,8 +11,8 @@ describe('Wallet', function() {
       wallet = new Wallet(seed)
     })
 
-    it('defaults to Bitcoin network', function() {
-      assert.equal(wallet.getMasterKey().network, 'Bitcoin')
+    it('defaults to Bitcoin mainnet', function() {
+      assert.equal(wallet.getMasterKey().network, 'prod')
     })
 
     it('defaults to private derivationMethod', function() {
@@ -23,11 +23,11 @@ describe('Wallet', function() {
   describe('constructor options', function() {
     var wallet;
     beforeEach(function() {
-      wallet = new Wallet(seed, {network: 'Test', derivationMethod: 'public'})
+      wallet = new Wallet(seed, {network: 'testnet', derivationMethod: 'public'})
     })
 
     it('uses the network if specified', function() {
-      assert.equal(wallet.getMasterKey().network, 'Test')
+      assert.equal(wallet.getMasterKey().network, 'testnet')
     })
 
     it('uses the derivationMethod if specified', function() {
@@ -37,14 +37,14 @@ describe('Wallet', function() {
 
   describe('networkType', function() {
     it('ensures that a mainnet Wallet has mainnet child keys (pub and priv)', function() {
-        var w = Wallet("foobar", {network: "Bitcoin"})
+        var w = Wallet("foobar", {network: "prod"})
         assert(w.getMasterKey().priv.version == Address.address_types['prod'])
         w.generateAddress()
         assert(w.getPrivateKey(0).priv.version == Address.address_types['prod'])
     })
 
     it('ensures that a testnet Wallet has testnet child keys (pub and priv)', function() {
-        var w = Wallet("foobar", {network: "BitcoinTest"})
+        var w = Wallet("foobar", {network: "testnet"})
         assert(w.getMasterKey().priv.version == Address.address_types['testnet'])
         w.generateAddress()
         assert(w.getPrivateKey(0).priv.version == Address.address_types['testnet'])