diff --git a/src/wallet/utils.js b/src/wallet/utils.js
index 587b01e..7cdbb74 100644
--- a/src/wallet/utils.js
+++ b/src/wallet/utils.js
@@ -210,17 +210,16 @@ function extractScriptHashFromP2SH (script) {
 }
 
 function getScriptType (script) {
-  const firstByte = script.slice(0, 1).toString('hex')
-
-  switch (firstByte) {
-    case '21':
-      return ScriptTypes.PAY_TO_PUBKEY
-    case '76':
-      return ScriptTypes.PAY_TO_PUBKEY_HASH
-    case 'a9':
-      return ScriptTypes.PAY_TO_SCRIPT_HASH
-    default:
-      return ScriptTypes.UNKNOWN
+  const firstByte = script.at(0)
+
+  if (firstByte === 0x41 && script.at(66) === 0xac) {
+    return ScriptTypes.PAY_TO_PUBKEY
+  } if (firstByte === 0x76 && script.at(24) === 0xac) {
+    return ScriptTypes.PAY_TO_PUBKEY_HASH
+  } if (firstByte === 0xa9 && script.at(22) === 0x87) {
+    return ScriptTypes.PAY_TO_SCRIPT_HASH
+  } else {
+    return ScriptTypes.UNKNOWN
   }
 }
 
@@ -240,3 +239,5 @@ module.exports = {
   extractPubkeyHashFromP2PKH,
   extractScriptHashFromP2SH
 }
+
+// 41049464205950188c29d377eebca6535e0f3699ce4069ecd77ffebfbd0bcf95e3c134cb7d2742d800a12df41413a09ef87a80516353a2f0a280547bb5512dc03da8ac
diff --git a/test/test_vectors/tx.json b/test/test_vectors/tx.json
index f0f22bd..110ceb9 100644
--- a/test/test_vectors/tx.json
+++ b/test/test_vectors/tx.json
@@ -1 +1,114 @@
-{"hex":"01000000010000000000000000000000000000000000000000000000000000000000000000ffffffff05028f110101ffffffff020010a5d4e80000002321028ae82f58d1e8c334411fb2232cbfb1ada81777dd4350b38055670efe97046efaac0000000000000000266a24aa21a9ede2f61c3f71d1defd3fa999dfa36953755c690689799962b48bebd836974e8cf900000000","value":{"id":"799b985c00bfb2acbd5f29308c602746c5fcde7c51f0d3c9d51ef83480f740f4","version":1,"txInCount":1,"txIns":[{"previousOutput":{"hash":"0000000000000000000000000000000000000000000000000000000000000000","index":"ffffffff"},"script":"028f110101","sequence":4294967295}],"txOutCount":2,"txOuts":[{"value":"1000000000000","pkScriptSize":35,"pkScript":{"type":"Buffer","data":[33,2,138,232,47,88,209,232,195,52,65,31,178,35,44,191,177,173,168,23,119,221,67,80,179,128,85,103,14,254,151,4,110,250,172]}},{"value":"0","pkScriptSize":38,"pkScript":{"type":"Buffer","data":[106,36,170,33,169,237,226,246,28,63,113,209,222,253,63,169,153,223,163,105,83,117,92,105,6,137,121,153,98,180,139,235,216,54,151,78,140,249]}}],"locktime":0,"size":147}}
\ No newline at end of file
+{
+    "hex": "01000000010000000000000000000000000000000000000000000000000000000000000000ffffffff05028f110101ffffffff020010a5d4e80000002321028ae82f58d1e8c334411fb2232cbfb1ada81777dd4350b38055670efe97046efaac0000000000000000266a24aa21a9ede2f61c3f71d1defd3fa999dfa36953755c690689799962b48bebd836974e8cf900000000",
+    "value": {
+        "id": "799b985c00bfb2acbd5f29308c602746c5fcde7c51f0d3c9d51ef83480f740f4",
+        "version": 1,
+        "txInCount": 1,
+        "txIns": [
+            {
+                "previousOutput": {
+                    "hash": "0000000000000000000000000000000000000000000000000000000000000000",
+                    "index": "ffffffff"
+                },
+                "script": "028f110101",
+                "sequence": 4294967295
+            }
+        ],
+        "txOutCount": 2,
+        "txOuts": [
+            {
+                "value": "1000000000000",
+                "pkScriptSize": 35,
+                "pkScript": {
+                    "type": "Buffer",
+                    "data": [
+                        33,
+                        2,
+                        138,
+                        232,
+                        47,
+                        88,
+                        209,
+                        232,
+                        195,
+                        52,
+                        65,
+                        31,
+                        178,
+                        35,
+                        44,
+                        191,
+                        177,
+                        173,
+                        168,
+                        23,
+                        119,
+                        221,
+                        67,
+                        80,
+                        179,
+                        128,
+                        85,
+                        103,
+                        14,
+                        254,
+                        151,
+                        4,
+                        110,
+                        250,
+                        172
+                    ]
+                }
+            },
+            {
+                "value": "0",
+                "pkScriptSize": 38,
+                "pkScript": {
+                    "type": "Buffer",
+                    "data": [
+                        106,
+                        36,
+                        170,
+                        33,
+                        169,
+                        237,
+                        226,
+                        246,
+                        28,
+                        63,
+                        113,
+                        209,
+                        222,
+                        253,
+                        63,
+                        169,
+                        153,
+                        223,
+                        163,
+                        105,
+                        83,
+                        117,
+                        92,
+                        105,
+                        6,
+                        137,
+                        121,
+                        153,
+                        98,
+                        180,
+                        139,
+                        235,
+                        216,
+                        54,
+                        151,
+                        78,
+                        140,
+                        249
+                    ]
+                }
+            }
+        ],
+        "locktime": 0,
+        "size": 147
+    }
+}
\ No newline at end of file
diff --git a/test/unit/wallet.utils.test.js b/test/unit/wallet.utils.test.js
index 2388817..243e229 100644
--- a/test/unit/wallet.utils.test.js
+++ b/test/unit/wallet.utils.test.js
@@ -4,8 +4,12 @@ const bip65 = require('bip65')
 const {
   pubkeyToAddress,
   createPayToHash,
-  serializePayToMultisigWithTimeLockScript
+  serializePayToMultisigWithTimeLockScript,
+  getScriptType
 } = require('../../src/wallet/utils')
+const {
+  ScriptTypes
+} = require('../../src/wallet/scripts')
 
 const TESTNET_NETWORK_BYTE = '71'
 
@@ -26,7 +30,7 @@ const keyPairA = bitcoinjs.ECPair.fromPrivateKey(Buffer.from('3b187fd3a10960efe5
 const keyPairB = bitcoinjs.ECPair.fromPrivateKey(Buffer.from('5cdc1bf38cd77f6a0f130d50e6e37b1d1e3eb59b78f3fde6c1572f44e7f709ed', 'hex'))
 
 /*
-  pubkeyToAddress.js
+  pubkeyToAddress
 */
 test('successfully convert public key to address', t => {
   const pubkey = Buffer.from('04ffd03de44a6e11b9917f3a29f9443283d9871c9d743ef30d5eddcd37094b64d1b3d8090496b53256786bf5c82932ec23c3b74d9f05a6f95a8b5529352656664b', 'hex')
@@ -71,3 +75,30 @@ test('successfully create pay to hash script', t => {
 
   t.is(p2shScript, expectedp2shScript)
 })
+
+/*
+  getScriptType
+*/
+test('successfully detect pay to pubkey hash', t => {
+  const p2pkhScript = bitcoinjs.script.fromASM('OP_DUP OP_HASH160 0817fa995b26604c5ed08c160f0bc2141567ce72 OP_EQUALVERIFY OP_CHECKSIG')
+
+  const scriptType = getScriptType(p2pkhScript)
+
+  t.is(scriptType, ScriptTypes.PAY_TO_PUBKEY_HASH)
+})
+
+test('successfully detect pay to pubkey', t => {
+  const p2pkScript = bitcoinjs.script.fromASM('049464205950188c29d377eebca6535e0f3699ce4069ecd77ffebfbd0bcf95e3c134cb7d2742d800a12df41413a09ef87a80516353a2f0a280547bb5512dc03da8 OP_CHECKSIG')
+
+  const scriptType = getScriptType(p2pkScript)
+
+  t.is(scriptType, ScriptTypes.PAY_TO_PUBKEY)
+})
+
+test('successfully detect pay to hash script', t => {
+  const p2shScript = bitcoinjs.script.fromASM('OP_HASH160 0817fa995b26604c5ed08c160f0bc2141567ce72 OP_EQUAL')
+
+  const scriptType = getScriptType(p2shScript)
+
+  t.is(scriptType, ScriptTypes.PAY_TO_SCRIPT_HASH)
+})