diff --git a/test/integration/transactions.js b/test/integration/transactions.js
index 78f2333..a288d03 100644
--- a/test/integration/transactions.js
+++ b/test/integration/transactions.js
@@ -13,34 +13,34 @@ function rng () {
 describe('bitcoinjs-lib (transactions)', function () {
   it('can create a 1-to-1 Transaction', function () {
     var alice = bitcoin.ECPair.fromWIF('L1uyy5qTuGrVXrmrsvHWHgVzW9kKdrp27wBC7Vs6nZDTF2BRUVwy')
-    var tx = new bitcoin.TransactionBuilder()
+    var txb = new bitcoin.TransactionBuilder()
 
-    tx.addInput('61d520ccb74288c96bc1a2b20ea1c0d5a704776dd0164a396efec3ea7040349d', 0) // Alice's previous transaction output, has 15000 satoshis
-    tx.addOutput('1cMh228HTCiwS8ZsaakH8A8wze1JR5ZsP', 12000)
+    txb.addInput('61d520ccb74288c96bc1a2b20ea1c0d5a704776dd0164a396efec3ea7040349d', 0) // Alice's previous transaction output, has 15000 satoshis
+    txb.addOutput('1cMh228HTCiwS8ZsaakH8A8wze1JR5ZsP', 12000)
     // (in)15000 - (out)12000 = (fee)3000, this is the miner fee
 
-    tx.sign(0, alice)
+    txb.sign(0, alice)
 
     // prepare for broadcast to the Bitcoin network, see "can broadcast a Transaction" below
-    assert.strictEqual(tx.build().toHex(), '01000000019d344070eac3fe6e394a16d06d7704a7d5c0a10eb2a2c16bc98842b7cc20d561000000006b48304502210088828c0bdfcdca68d8ae0caeb6ec62cd3fd5f9b2191848edae33feb533df35d302202e0beadd35e17e7f83a733f5277028a9b453d525553e3f5d2d7a7aa8010a81d60121029f50f51d63b345039a290c94bffd3180c99ed659ff6ea6b1242bca47eb93b59fffffffff01e02e0000000000001976a91406afd46bcdfd22ef94ac122aa11f241244a37ecc88ac00000000')
+    assert.strictEqual(txb.build().toHex(), '01000000019d344070eac3fe6e394a16d06d7704a7d5c0a10eb2a2c16bc98842b7cc20d561000000006b48304502210088828c0bdfcdca68d8ae0caeb6ec62cd3fd5f9b2191848edae33feb533df35d302202e0beadd35e17e7f83a733f5277028a9b453d525553e3f5d2d7a7aa8010a81d60121029f50f51d63b345039a290c94bffd3180c99ed659ff6ea6b1242bca47eb93b59fffffffff01e02e0000000000001976a91406afd46bcdfd22ef94ac122aa11f241244a37ecc88ac00000000')
   })
 
   it('can create a 2-to-2 Transaction', function () {
     var alice = bitcoin.ECPair.fromWIF('L1Knwj9W3qK3qMKdTvmg3VfzUs3ij2LETTFhxza9LfD5dngnoLG1')
     var bob = bitcoin.ECPair.fromWIF('KwcN2pT3wnRAurhy7qMczzbkpY5nXMW2ubh696UBc1bcwctTx26z')
 
-    var tx = new bitcoin.TransactionBuilder()
-    tx.addInput('b5bb9d8014a0f9b1d61e21e796d78dccdf1352f23cd32812f4850b878ae4944c', 6) // Alice's previous transaction output, has 200000 satoshis
-    tx.addInput('7d865e959b2466918c9863afca942d0fb89d7c9ac0c99bafc3749504ded97730', 0) // Bob's previous transaction output, has 300000 satoshis
-    tx.addOutput('1CUNEBjYrCn2y1SdiUMohaKUi4wpP326Lb', 180000)
-    tx.addOutput('1JtK9CQw1syfWj1WtFMWomrYdV3W2tWBF9', 170000)
+    var txb = new bitcoin.TransactionBuilder()
+    txb.addInput('b5bb9d8014a0f9b1d61e21e796d78dccdf1352f23cd32812f4850b878ae4944c', 6) // Alice's previous transaction output, has 200000 satoshis
+    txb.addInput('7d865e959b2466918c9863afca942d0fb89d7c9ac0c99bafc3749504ded97730', 0) // Bob's previous transaction output, has 300000 satoshis
+    txb.addOutput('1CUNEBjYrCn2y1SdiUMohaKUi4wpP326Lb', 180000)
+    txb.addOutput('1JtK9CQw1syfWj1WtFMWomrYdV3W2tWBF9', 170000)
     // (in)(200000 + 300000) - (out)(180000 + 150000) = (fee)170000, this is the miner fee
 
-    tx.sign(1, bob) // Bob signs his input, which was the second input (1th)
-    tx.sign(0, alice) // Alice signs her input, which was the first input (0th)
+    txb.sign(1, bob) // Bob signs his input, which was the second input (1th)
+    txb.sign(0, alice) // Alice signs her input, which was the first input (0th)
 
     // prepare for broadcast to the Bitcoin network, see "can broadcast a Transaction" below
-    assert.strictEqual(tx.build().toHex(), '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')
+    assert.strictEqual(txb.build().toHex(), '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')
   })
 
   it('can create (and broadcast via 3PBP) a typical Transaction', function (done) {
@@ -63,23 +63,23 @@ describe('bitcoinjs-lib (transactions)', function () {
     ], function (err, unspents) {
       if (err) return done(err)
 
-      var tx = new bitcoin.TransactionBuilder(testnet)
-      tx.addInput(unspents[0].txId, unspents[0].vout) // alice1 unspent
-      tx.addInput(unspents[1].txId, unspents[1].vout) // alice2 unspent
-      tx.addOutput('mwCwTceJvYV27KXBc3NJZys6CjsgsoeHmf', 8e4) // the actual "spend"
-      tx.addOutput(aliceChange.getAddress(), 1e4) // Alice's change
+      var txb = new bitcoin.TransactionBuilder(testnet)
+      txb.addInput(unspents[0].txId, unspents[0].vout) // alice1 unspent
+      txb.addInput(unspents[1].txId, unspents[1].vout) // alice2 unspent
+      txb.addOutput('mwCwTceJvYV27KXBc3NJZys6CjsgsoeHmf', 8e4) // the actual "spend"
+      txb.addOutput(aliceChange.getAddress(), 1e4) // Alice's change
       // (in)(4e4 + 2e4) - (out)(1e4 + 3e4) = (fee)2e4 = 20000, this is the miner fee
 
       // Alice signs each input with the respective private keys
-      tx.sign(0, alice1)
-      tx.sign(1, alice2)
+      txb.sign(0, alice1)
+      txb.sign(1, alice2)
 
       // build and broadcast to the Bitcoin Testnet network
       dhttp({
         method: 'POST',
         url: 'https://api.ei8ht.com.au:9443/3/pushtx',
 //          url: 'http://tbtc.blockr.io/api/v1/tx/push',
-        body: tx.build().toHex()
+        body: txb.build().toHex()
       }, done)
       // to build and broadcast to the actual Bitcoin network, see https://github.com/bitcoinjs/bitcoinjs-lib/issues/839
     })
@@ -94,20 +94,20 @@ describe('bitcoinjs-lib (transactions)', function () {
     testnetUtils.faucet(address, 5e4, function (err, unspent) {
       if (err) return done(err)
 
-      var tx = new bitcoin.TransactionBuilder(testnet)
+      var txb = new bitcoin.TransactionBuilder(testnet)
       var data = Buffer.from('bitcoinjs-lib', 'utf8')
       var dataScript = bitcoin.script.nullData.output.encode(data)
 
-      tx.addInput(unspent.txId, unspent.vout)
-      tx.addOutput(dataScript, 1000)
-      tx.addOutput(testnetUtils.RETURN_ADDRESS, 4e4)
-      tx.sign(0, keyPair)
+      txb.addInput(unspent.txId, unspent.vout)
+      txb.addOutput(dataScript, 1000)
+      txb.addOutput(testnetUtils.RETURN_ADDRESS, 4e4)
+      txb.sign(0, keyPair)
 
       // build and broadcast to the Bitcoin Testnet network
       dhttp({
         method: 'POST',
         url: 'https://api.ei8ht.com.au:9443/3/pushtx',
-        body: tx.build().toHex()
+        body: txb.build().toHex()
       }, done)
     })
   })