diff --git a/package.json b/package.json
index 9880116..1ee96bd 100644
--- a/package.json
+++ b/package.json
@@ -51,7 +51,8 @@
     "bigi": "^1.1.0",
     "bs58check": "1.0.3",
     "crypto-browserify": "^3.2.6",
-    "ecurve": "1.0.0"
+    "ecurve": "1.0.0",
+    "typeforce": "0.0.2"
   },
   "devDependencies": {
     "async": "^0.9.0",
diff --git a/src/address.js b/src/address.js
index cc6264f..be2b239 100644
--- a/src/address.js
+++ b/src/address.js
@@ -1,6 +1,6 @@
 var assert = require('assert')
 var base58check = require('bs58check')
-var enforceType = require('./types')
+var typeForce = require('typeforce')
 var networks = require('./networks')
 var scripts = require('./scripts')
 
@@ -14,7 +14,7 @@ function findScriptTypeByVersion(version) {
 }
 
 function Address(hash, version) {
-  enforceType('Buffer', hash)
+  typeForce('Buffer', hash)
 
   assert.strictEqual(hash.length, 20, 'Invalid hash length')
   assert.strictEqual(version & 0xff, version, 'Invalid version byte')
diff --git a/src/ecdsa.js b/src/ecdsa.js
index e3343fa..28ba1b4 100644
--- a/src/ecdsa.js
+++ b/src/ecdsa.js
@@ -1,6 +1,6 @@
 var assert = require('assert')
 var crypto = require('crypto')
-var enforceType = require('./types')
+var typeForce = require('typeforce')
 
 var BigInteger = require('bigi')
 var ECSignature = require('./ecsignature')
@@ -10,8 +10,8 @@ var ONE = new Buffer([1])
 
 // https://tools.ietf.org/html/rfc6979#section-3.2
 function deterministicGenerateK(curve, hash, d) {
-  enforceType('Buffer', hash)
-  enforceType(BigInteger, d)
+  typeForce('Buffer', hash)
+  typeForce('BigInteger', d)
 
   // sanity check
   assert.equal(hash.length, 32, 'Hash must be 256 bit')
diff --git a/src/eckey.js b/src/eckey.js
index 501384d..74ba93c 100644
--- a/src/eckey.js
+++ b/src/eckey.js
@@ -2,7 +2,7 @@ var assert = require('assert')
 var base58check = require('bs58check')
 var crypto = require('crypto')
 var ecdsa = require('./ecdsa')
-var enforceType = require('./types')
+var typeForce = require('typeforce')
 var networks = require('./networks')
 
 var BigInteger = require('bigi')
@@ -50,7 +50,7 @@ ECKey.makeRandom = function(compressed, rng) {
   rng = rng || crypto.randomBytes
 
   var buffer = rng(32)
-  enforceType('Buffer', buffer)
+  typeForce('Buffer', buffer)
   assert.equal(buffer.length, 32, 'Expected 256-bit Buffer from RNG')
 
   var d = BigInteger.fromBuffer(buffer)
diff --git a/src/ecpubkey.js b/src/ecpubkey.js
index e2b25bc..860e415 100644
--- a/src/ecpubkey.js
+++ b/src/ecpubkey.js
@@ -1,6 +1,6 @@
 var crypto = require('./crypto')
 var ecdsa = require('./ecdsa')
-var enforceType = require('./types')
+var typeForce = require('typeforce')
 var networks = require('./networks')
 
 var Address = require('./address')
@@ -11,8 +11,8 @@ var secp256k1 = ecurve.getCurveByName('secp256k1')
 function ECPubKey(Q, compressed) {
   if (compressed === undefined) compressed = true
 
-  enforceType(ecurve.Point, Q)
-  enforceType('Boolean', compressed)
+  typeForce('Point', Q)
+  typeForce('Boolean', compressed)
 
   this.compressed = compressed
   this.Q = Q
diff --git a/src/ecsignature.js b/src/ecsignature.js
index 7b71c61..073d7f1 100644
--- a/src/ecsignature.js
+++ b/src/ecsignature.js
@@ -1,11 +1,11 @@
 var assert = require('assert')
-var enforceType = require('./types')
+var typeForce = require('typeforce')
 
 var BigInteger = require('bigi')
 
 function ECSignature(r, s) {
-  enforceType(BigInteger, r)
-  enforceType(BigInteger, s)
+  typeForce('BigInteger', r)
+  typeForce('BigInteger', s)
 
   this.r = r
   this.s = s
diff --git a/src/hdnode.js b/src/hdnode.js
index 03e5bb1..e81dc4e 100644
--- a/src/hdnode.js
+++ b/src/hdnode.js
@@ -2,7 +2,7 @@ var assert = require('assert')
 var base58check = require('bs58check')
 var bcrypto = require('./crypto')
 var crypto = require('crypto')
-var enforceType = require('./types')
+var typeForce = require('typeforce')
 var networks = require('./networks')
 
 var BigInteger = require('bigi')
@@ -29,7 +29,7 @@ function findBIP32NetworkByVersion(version) {
 function HDNode(K, chainCode, network) {
   network = network || networks.bitcoin
 
-  enforceType('Buffer', chainCode)
+  typeForce('Buffer', chainCode)
 
   assert.equal(chainCode.length, 32, 'Expected chainCode length of 32, got ' + chainCode.length)
   assert(network.bip32, 'Unknown BIP32 constants for network')
@@ -53,7 +53,7 @@ HDNode.HIGHEST_BIT = 0x80000000
 HDNode.LENGTH = 78
 
 HDNode.fromSeedBuffer = function(seed, network) {
-  enforceType('Buffer', seed)
+  typeForce('Buffer', seed)
 
   assert(seed.length >= 16, 'Seed should be at least 128 bits')
   assert(seed.length <= 64, 'Seed should be at most 512 bits')
diff --git a/src/script.js b/src/script.js
index d3afc70..2283495 100644
--- a/src/script.js
+++ b/src/script.js
@@ -1,12 +1,12 @@
 var assert = require('assert')
 var bufferutils = require('./bufferutils')
 var crypto = require('./crypto')
-var enforceType = require('./types')
+var typeForce = require('typeforce')
 var opcodes = require('./opcodes')
 
 function Script(buffer, chunks) {
-  enforceType('Buffer', buffer)
-  enforceType('Array', chunks)
+  typeForce('Buffer', buffer)
+  typeForce('Array', chunks)
 
   this.buffer = buffer
   this.chunks = chunks
@@ -56,7 +56,7 @@ Script.fromBuffer = function(buffer) {
 }
 
 Script.fromChunks = function(chunks) {
-  enforceType('Array', chunks)
+  typeForce('Array', chunks)
 
   var bufferSize = chunks.reduce(function(accum, chunk) {
     if (Buffer.isBuffer(chunk)) {
diff --git a/src/scripts.js b/src/scripts.js
index 0ffb1e0..33f51ca 100644
--- a/src/scripts.js
+++ b/src/scripts.js
@@ -1,5 +1,5 @@
 var assert = require('assert')
-var enforceType = require('./types')
+var typeForce = require('typeforce')
 var ops = require('./opcodes')
 
 var ecurve = require('ecurve')
@@ -117,7 +117,7 @@ function isNullDataOutput(script) {
 }
 
 function classifyOutput(script) {
-  enforceType(Script, script)
+  typeForce('Script', script)
 
   if (isPubKeyHashOutput(script)) {
     return 'pubkeyhash'
@@ -135,7 +135,7 @@ function classifyOutput(script) {
 }
 
 function classifyInput(script) {
-  enforceType(Script, script)
+  typeForce('Script', script)
 
   if (isPubKeyHashInput(script)) {
     return 'pubkeyhash'
@@ -161,7 +161,7 @@ function pubKeyOutput(pubKey) {
 
 // OP_DUP OP_HASH160 {pubKeyHash} OP_EQUALVERIFY OP_CHECKSIG
 function pubKeyHashOutput(hash) {
-  enforceType('Buffer', hash)
+  typeForce('Buffer', hash)
 
   return Script.fromChunks([
     ops.OP_DUP,
@@ -174,7 +174,7 @@ function pubKeyHashOutput(hash) {
 
 // OP_HASH160 {scriptHash} OP_EQUAL
 function scriptHashOutput(hash) {
-  enforceType('Buffer', hash)
+  typeForce('Buffer', hash)
 
   return Script.fromChunks([
     ops.OP_HASH160,
@@ -185,7 +185,7 @@ function scriptHashOutput(hash) {
 
 // m [pubKeys ...] n OP_CHECKMULTISIG
 function multisigOutput(m, pubKeys) {
-  enforceType('Array', pubKeys)
+  typeForce('Array', pubKeys)
 
   assert(pubKeys.length >= m, 'Not enough pubKeys provided')
 
@@ -204,14 +204,14 @@ function multisigOutput(m, pubKeys) {
 
 // {signature}
 function pubKeyInput(signature) {
-  enforceType('Buffer', signature)
+  typeForce('Buffer', signature)
 
   return Script.fromChunks([signature])
 }
 
 // {signature} {pubKey}
 function pubKeyHashInput(signature, pubKey) {
-  enforceType('Buffer', signature)
+  typeForce('Buffer', signature)
 
   return Script.fromChunks([signature, pubKey.toBuffer()])
 }
diff --git a/src/transaction.js b/src/transaction.js
index 167126c..a952dbb 100644
--- a/src/transaction.js
+++ b/src/transaction.js
@@ -1,7 +1,7 @@
 var assert = require('assert')
 var bufferutils = require('./bufferutils')
 var crypto = require('./crypto')
-var enforceType = require('./types')
+var typeForce = require('typeforce')
 var opcodes = require('./opcodes')
 var scripts = require('./scripts')
 
@@ -96,7 +96,7 @@ Transaction.prototype.addInput = function(hash, index, sequence, script) {
   if (sequence === undefined || sequence === null) {
     sequence = Transaction.DEFAULT_SEQUENCE
   }
-  
+
   script = script || Script.EMPTY
 
   if (typeof hash === 'string') {
@@ -108,10 +108,10 @@ Transaction.prototype.addInput = function(hash, index, sequence, script) {
 
   }
 
-  enforceType('Buffer', hash)
-  enforceType('Number', index)
-  enforceType('Number', sequence)
-  enforceType(Script, script)
+  typeForce('Buffer', hash)
+  typeForce('Number', index)
+  typeForce('Number', sequence)
+  typeForce('Script', script)
 
   assert.equal(hash.length, 32, 'Expected hash length of 32, got ' + hash.length)
 
@@ -144,8 +144,8 @@ Transaction.prototype.addOutput = function(scriptPubKey, value) {
     scriptPubKey = scriptPubKey.toOutputScript()
   }
 
-  enforceType(Script, scriptPubKey)
-  enforceType('Number', value)
+  typeForce('Script', scriptPubKey)
+  typeForce('Number', value)
 
   // Add the output and return the output's index
   return (this.outs.push({
@@ -197,9 +197,9 @@ Transaction.prototype.hashForSignature = function(inIndex, prevOutScript, hashTy
     prevOutScript = tmp
   }
 
-  enforceType('Number', inIndex)
-  enforceType(Script, prevOutScript)
-  enforceType('Number', hashType)
+  typeForce('Number', inIndex)
+  typeForce('Script', prevOutScript)
+  typeForce('Number', hashType)
 
   assert(inIndex >= 0, 'Invalid vin index')
   assert(inIndex < this.ins.length, 'Invalid vin index')
diff --git a/src/types.js b/src/types.js
deleted file mode 100644
index 5f885d0..0000000
--- a/src/types.js
+++ /dev/null
@@ -1,40 +0,0 @@
-module.exports = function enforce(type, value) {
-  switch (type) {
-    case 'Array': {
-      if (Array.isArray(value)) return
-      break
-    }
-
-    case 'Boolean': {
-      if (typeof value === 'boolean') return
-      break
-    }
-
-    case 'Buffer': {
-      if (Buffer.isBuffer(value)) return
-      break
-    }
-
-    case 'Number': {
-      if (typeof value === 'number') return
-      break
-    }
-
-    case 'String': {
-      if (typeof value === 'string') return
-      break
-    }
-
-    default: {
-      if (getName(value.constructor) === getName(type)) return
-    }
-  }
-
-  throw new TypeError('Expected ' + (getName(type) || type) + ', got ' + value)
-}
-
-function getName(fn) {
-  // Why not fn.name: https://kangax.github.io/compat-table/es6/#function_name_property
-  var match = fn.toString().match(/function (.*?)\(/)
-  return match ? match[1] : null
-}
diff --git a/src/wallet.js b/src/wallet.js
index f7068ff..3e3ab77 100644
--- a/src/wallet.js
+++ b/src/wallet.js
@@ -1,7 +1,7 @@
 var assert = require('assert')
 var bufferutils = require('./bufferutils')
 var crypto = require('crypto')
-var enforceType = require('./types')
+var typeForce = require('typeforce')
 var networks = require('./networks')
 
 var Address = require('./address')
@@ -303,9 +303,9 @@ Wallet.prototype.setUnspentOutputs = function(unspents) {
       index = unspent.outputIndex
     }
 
-    enforceType('String', txId)
-    enforceType('Number', index)
-    enforceType('Number', unspent.value)
+    typeForce('String', txId)
+    typeForce('Number', index)
+    typeForce('Number', unspent.value)
 
     assert.equal(txId.length, 64, 'Expected valid txId, got ' + txId)
     assert.doesNotThrow(function() { Address.fromBase58Check(unspent.address) }, 'Expected Base58 Address, got ' + unspent.address)
@@ -313,7 +313,7 @@ Wallet.prototype.setUnspentOutputs = function(unspents) {
 
     // FIXME: remove branch in 2.0.0
     if (unspent.confirmations !== undefined) {
-      enforceType('Number', unspent.confirmations)
+      typeForce('Number', unspent.confirmations)
     }
 
     var txHash = bufferutils.reverse(new Buffer(txId, 'hex'))
diff --git a/test/types.js b/test/types.js
deleted file mode 100644
index fe1d149..0000000
--- a/test/types.js
+++ /dev/null
@@ -1,28 +0,0 @@
-var assert = require('assert')
-var enforceType = require('../src/types')
-
-function CustomType() { return "ensure non-greedy match".toUpperCase() }
-
-var types = ['Array', 'Boolean', 'Buffer', 'Number', 'String', CustomType]
-var values = [[], true, new Buffer(1), 1234, 'foobar', new CustomType()]
-
-describe('enforceType', function() {
-  types.forEach(function(type, i) {
-    describe(type, function() {
-      values.forEach(function(value, j) {
-        if (j === i) {
-          it('passes for ' + types[j], function() {
-            enforceType(type, value)
-          })
-
-        } else {
-          it('fails for ' + types[j], function() {
-            assert.throws(function() {
-              enforceType(type, value)
-            }, new RegExp('Expected ' + (type.name || type) + ', got '))
-          })
-        }
-      })
-    })
-  })
-})