diff --git a/src/script.js b/src/script.js
index 2860d66..290ba00 100644
--- a/src/script.js
+++ b/src/script.js
@@ -1,5 +1,6 @@
 var Buffer = require('safe-buffer').Buffer
 var bip66 = require('bip66')
+let ecc = require('tiny-secp256k1')
 var pushdata = require('pushdata-bitcoin')
 var typeforce = require('typeforce')
 var types = require('./types')
@@ -170,18 +171,7 @@ function toStack (chunks) {
 }
 
 function isCanonicalPubKey (buffer) {
-  if (!Buffer.isBuffer(buffer)) return false
-  if (buffer.length < 33) return false
-
-  switch (buffer[0]) {
-    case 0x02:
-    case 0x03:
-      return buffer.length === 33
-    case 0x04:
-      return buffer.length === 65
-  }
-
-  return false
+  return ecc.isPoint(buffer)
 }
 
 function isDefinedHashType (hashType) {
@@ -191,7 +181,7 @@ function isDefinedHashType (hashType) {
   return hashTypeMod > 0x00 && hashTypeMod < 0x04
 }
 
-function isCanonicalSignature (buffer) {
+function isCanonicalScriptSignature (buffer) {
   if (!Buffer.isBuffer(buffer)) return false
   if (!isDefinedHashType(buffer[buffer.length - 1])) return false
 
@@ -209,7 +199,7 @@ module.exports = {
   signature: require('./script_signature'),
 
   isCanonicalPubKey: isCanonicalPubKey,
-  isCanonicalSignature: isCanonicalSignature,
+  isCanonicalScriptSignature: isCanonicalScriptSignature,
   isPushOnly: isPushOnly,
   isDefinedHashType: isDefinedHashType
 }
diff --git a/src/templates/multisig/input.js b/src/templates/multisig/input.js
index a0b2eee..0ba0a06 100644
--- a/src/templates/multisig/input.js
+++ b/src/templates/multisig/input.js
@@ -7,7 +7,7 @@ var typeforce = require('typeforce')
 var OPS = require('bitcoin-ops')
 
 function partialSignature (value) {
-  return value === OPS.OP_0 || bscript.isCanonicalSignature(value)
+  return value === OPS.OP_0 || bscript.isCanonicalScriptSignature(value)
 }
 
 function check (script, allowIncomplete) {
@@ -19,7 +19,7 @@ function check (script, allowIncomplete) {
     return chunks.slice(1).every(partialSignature)
   }
 
-  return chunks.slice(1).every(bscript.isCanonicalSignature)
+  return chunks.slice(1).every(bscript.isCanonicalScriptSignature)
 }
 check.toJSON = function () { return 'multisig input' }
 
diff --git a/src/templates/pubkey/input.js b/src/templates/pubkey/input.js
index 4c61664..9149289 100644
--- a/src/templates/pubkey/input.js
+++ b/src/templates/pubkey/input.js
@@ -7,12 +7,12 @@ function check (script) {
   var chunks = bscript.decompile(script)
 
   return chunks.length === 1 &&
-    bscript.isCanonicalSignature(chunks[0])
+    bscript.isCanonicalScriptSignature(chunks[0])
 }
 check.toJSON = function () { return 'pubKey input' }
 
 function encodeStack (signature) {
-  typeforce(bscript.isCanonicalSignature, signature)
+  typeforce(bscript.isCanonicalScriptSignature, signature)
   return [signature]
 }
 
diff --git a/src/templates/pubkeyhash/input.js b/src/templates/pubkeyhash/input.js
index ae1d758..81e1f80 100644
--- a/src/templates/pubkeyhash/input.js
+++ b/src/templates/pubkeyhash/input.js
@@ -7,14 +7,14 @@ function check (script) {
   var chunks = bscript.decompile(script)
 
   return chunks.length === 2 &&
-    bscript.isCanonicalSignature(chunks[0]) &&
+    bscript.isCanonicalScriptSignature(chunks[0]) &&
     bscript.isCanonicalPubKey(chunks[1])
 }
 check.toJSON = function () { return 'pubKeyHash input' }
 
 function encodeStack (signature, pubKey) {
   typeforce({
-    signature: bscript.isCanonicalSignature,
+    signature: bscript.isCanonicalScriptSignature,
     pubKey: bscript.isCanonicalPubKey
   }, {
     signature: signature,
diff --git a/src/templates/witnesspubkeyhash/input.js b/src/templates/witnesspubkeyhash/input.js
index d61c426..089c8d8 100644
--- a/src/templates/witnesspubkeyhash/input.js
+++ b/src/templates/witnesspubkeyhash/input.js
@@ -11,14 +11,14 @@ function check (script) {
   var chunks = bscript.decompile(script)
 
   return chunks.length === 2 &&
-    bscript.isCanonicalSignature(chunks[0]) &&
+    bscript.isCanonicalScriptSignature(chunks[0]) &&
     isCompressedCanonicalPubKey(chunks[1])
 }
 check.toJSON = function () { return 'witnessPubKeyHash input' }
 
 function encodeStack (signature, pubKey) {
   typeforce({
-    signature: bscript.isCanonicalSignature,
+    signature: bscript.isCanonicalScriptSignature,
     pubKey: isCompressedCanonicalPubKey
   }, {
     signature: signature,
diff --git a/test/script.js b/test/script.js
index 5a51dbd..537e75a 100644
--- a/test/script.js
+++ b/test/script.js
@@ -19,7 +19,8 @@ describe('script', function () {
       }
     })
   })
-  describe.skip('isCanonicalSignature', function () {})
+  describe.skip('isCanonicalScriptSignature', function () {
+  })
 
   describe('fromASM/toASM', function () {
     fixtures.valid.forEach(function (f) {
diff --git a/test/transaction_builder.js b/test/transaction_builder.js
index c5c7c1e..499db0c 100644
--- a/test/transaction_builder.js
+++ b/test/transaction_builder.js
@@ -303,7 +303,7 @@ describe('TransactionBuilder', function () {
   describe('sign', function () {
     it('supports the alternative abstract interface { publicKey, sign }', function () {
       var keyPair = {
-        publicKey: Buffer.alloc(33, 0x03),
+        publicKey: ECPair.makeRandom({ rng: function () { return Buffer.alloc(32, 1) } }).publicKey,
         sign: function (hash) { return Buffer.alloc(64, 0x5f) }
       }
 
@@ -312,7 +312,7 @@ describe('TransactionBuilder', function () {
       txb.addInput('ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff', 1)
       txb.addOutput('1111111111111111111114oLvT2', 100000)
       txb.sign(0, keyPair)
-      assert.equal(txb.build().toHex(), '0100000001ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff010000006a47304402205f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f02205f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f0121030303030303030303030303030303030303030303030303030303030303030303ffffffff01a0860100000000001976a914000000000000000000000000000000000000000088ac00000000')
+      assert.equal(txb.build().toHex(), '0100000001ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff010000006a47304402205f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f02205f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f5f0121031b84c5567b126440995d3ed5aaba0565d71e1834604819ff9c17f5e9d5dd078fffffffff01a0860100000000001976a914000000000000000000000000000000000000000088ac00000000')
     })
 
     fixtures.invalid.sign.forEach(function (f) {