diff --git a/src/wallet.js b/src/wallet.js
index f4faf7f..00a0857 100644
--- a/src/wallet.js
+++ b/src/wallet.js
@@ -24,7 +24,7 @@ function Wallet(seed, network) {
   this.addresses = []
   this.changeAddresses = []
   this.network = network
-  this.outputs = {}
+  this.unspentMap = {}
 
   // FIXME: remove in 2.x.y
   var me = this
@@ -41,7 +41,7 @@ function Wallet(seed, network) {
     me.addresses = []
     me.changeAddresses = []
 
-    me.outputs = {}
+    me.unspentMap = {}
   }
 
   this.getMasterKey = function() { return masterKey }
@@ -53,7 +53,7 @@ function Wallet(seed, network) {
 Wallet.prototype.createTx = function(to, value, fixedFee, changeAddress) {
   assert(value > this.network.dustThreshold, value + ' must be above dust threshold (' + this.network.dustThreshold + ' Satoshis)')
 
-  var utxos = getCandidateOutputs(this.outputs, value)
+  var utxos = getCandidateOutputs(this.unspentMap, value)
   var accum = 0
   var subTotal = value
   var addresses = []
@@ -112,7 +112,7 @@ Wallet.prototype.__processTx = function(tx, isPending) {
     if (myAddresses.indexOf(address) > -1) {
       var output = txId + ':' + i
 
-      this.outputs[output] = {
+      this.unspentMap[output] = {
         hash: txHash,
         index: i,
         value: txOut.value,
@@ -127,14 +127,14 @@ Wallet.prototype.__processTx = function(tx, isPending) {
     var txinId = bufferutils.reverse(txIn.hash).toString('hex')
     var output = txinId + ':' + txIn.index
 
-    if (!(output in this.outputs)) return
+    if (!(output in this.unspentMap)) return
 
     if (isPending) {
-      this.outputs[output].pending = true
-      this.outputs[output].spent = true
+      this.unspentMap[output].pending = true
+      this.unspentMap[output].spent = true
 
     } else {
-      delete this.outputs[output]
+      delete this.unspentMap[output]
     }
   }, this)
 }
@@ -204,8 +204,8 @@ Wallet.prototype.getReceiveAddress = function() {
 Wallet.prototype.getUnspentOutputs = function() {
   var utxos = []
 
-  for (var key in this.outputs) {
-    var output = this.outputs[key]
+  for (var key in this.unspentMap) {
+    var output = this.unspentMap[key]
 
     // Don't include pending spent outputs
     if (!output.spent) {
@@ -245,7 +245,7 @@ Wallet.prototype.setUnspentOutputs = function(utxos) {
 
     var output = txId + ':' + index
 
-    this.outputs[output] = {
+    this.unspentMap[output] = {
       address: address,
       hash: hash,
       index: index,
diff --git a/test/wallet.js b/test/wallet.js
index c82c127..917c3bf 100644
--- a/test/wallet.js
+++ b/test/wallet.js
@@ -217,7 +217,7 @@ describe('Wallet', function() {
       })
 
       it('matches the expected behaviour', function() {
-        var output = wallet.outputs[expectedOutputKey]
+        var output = wallet.unspentMap[expectedOutputKey]
 
         assert(output)
         assert.equal(output.value, utxo.value)
@@ -250,7 +250,7 @@ describe('Wallet', function() {
       })
 
       it("ignores pending spending outputs (outputs with 'spent' property)", function() {
-        var output = wallet.outputs[expectedOutputKey]
+        var output = wallet.unspentMap[expectedOutputKey]
         output.pending = true
         output.spent = true
         assert.deepEqual(wallet.getUnspentOutputs(), [])
@@ -279,7 +279,7 @@ describe('Wallet', function() {
     it('matches the expected behaviour', function() {
       wallet.setUnspentOutputs([utxo])
 
-      var output = wallet.outputs[expectedOutputKey]
+      var output = wallet.unspentMap[expectedOutputKey]
       assert(output)
       assert.equal(output.value, utxo.value)
       assert.equal(output.address, utxo.address)
@@ -341,7 +341,7 @@ describe('Wallet', function() {
           txInId = txInId.toString('hex')
 
           var key = txInId + ':' + txIn.index
-          var output = wallet.outputs[key]
+          var output = wallet.unspentMap[key]
 
           assert(!output.pending)
           wallet.processPendingTx(spendTx)
@@ -363,7 +363,7 @@ describe('Wallet', function() {
         wallet.processConfirmedTx(tx2)
       })
 
-      describe("when tx outs contains an address owned by the wallet, an 'output' gets added to wallet.outputs", function() {
+      describe("when tx outs contains an address owned by the wallet, an 'output' gets added to wallet.unspentMap", function() {
         it("works for receive address", function() {
           var totalOuts = outputCount()
 
@@ -385,7 +385,7 @@ describe('Wallet', function() {
         })
 
         function outputCount() {
-          return Object.keys(wallet.outputs).length
+          return Object.keys(wallet.unspentMap).length
         }
       })
 
@@ -398,9 +398,9 @@ describe('Wallet', function() {
           spendTx = Transaction.fromHex(fixtureTx2Hex)
         })
 
-        it("does not add to wallet.outputs", function() {
+        it("does not add to wallet.unspentMap", function() {
           wallet.processConfirmedTx(spendTx)
-          assert.deepEqual(wallet.outputs, {})
+          assert.deepEqual(wallet.unspentMap, {})
         })
 
         it("deletes corresponding 'output'", function() {
@@ -410,16 +410,16 @@ describe('Wallet', function() {
           txInId = txInId.toString('hex')
 
           var expected = txInId + ':' + txIn.index
-          assert(expected in wallet.outputs)
+          assert(expected in wallet.unspentMap)
 
           wallet.processConfirmedTx(spendTx)
-          assert(!(expected in wallet.outputs))
+          assert(!(expected in wallet.unspentMap))
         })
       })
 
       it("does nothing when none of the involved addresses belong to the wallet", function() {
         wallet.processConfirmedTx(tx)
-        assert.deepEqual(wallet.outputs, {})
+        assert.deepEqual(wallet.unspentMap, {})
       })
     })
 
@@ -427,7 +427,7 @@ describe('Wallet', function() {
       var txOut = tx.outs[index]
 
       var key = tx.getId() + ":" + index
-      var output = wallet.outputs[key]
+      var output = wallet.unspentMap[key]
       assert.deepEqual(output.hash, tx.getHash())
       assert.equal(output.value, txOut.value)
       assert.equal(output.pending, pending)
@@ -514,7 +514,7 @@ describe('Wallet', function() {
       function getFee(wallet, tx) {
         var inputValue = tx.ins.reduce(function(memo, input){
           var id = Array.prototype.reverse.call(input.hash).toString('hex')
-          return memo + wallet.outputs[id + ':' + input.index].value
+          return memo + wallet.unspentMap[id + ':' + input.index].value
         }, 0)
 
         return tx.outs.reduce(function(memo, output){