diff --git a/lib/protocol/constants.js b/lib/protocol/constants.js
index c49f4697..03c401eb 100644
--- a/lib/protocol/constants.js
+++ b/lib/protocol/constants.js
@@ -777,7 +777,8 @@ exports.flags = {
   VERIFY_DISCOURAGE_UPGRADABLE_WITNESS_PROGRAM: (1 << 12),
   VERIFY_MINIMALIF: (1 << 13),
   VERIFY_NULLFAIL: (1 << 14),
-  VERIFY_MAST: (1 << 15), // should be 1 << 13
+  VERIFY_WITNESS_PUBKEYTYPE: (1 << 15),
+  VERIFY_MAST: (1 << 16), // should be 1 << 13
   VERIFY_SEQUENCE: (1 << 0),
   MEDIAN_TIME_PAST: (1 << 1)
 };
@@ -804,11 +805,14 @@ exports.flags.STANDARD_VERIFY_FLAGS = 0
   | exports.flags.VERIFY_NULLDUMMY
   | exports.flags.VERIFY_DISCOURAGE_UPGRADABLE_NOPS
   | exports.flags.VERIFY_CLEANSTACK
+  | exports.flags.VERIFY_MINIMALIF
+  | exports.flags.VERIFY_NULLFAIL
   | exports.flags.VERIFY_CHECKLOCKTIMEVERIFY
-  | exports.flags.VERIFY_LOW_S
   | exports.flags.VERIFY_CHECKSEQUENCEVERIFY
+  | exports.flags.VERIFY_LOW_S
   | exports.flags.VERIFY_WITNESS
-  | exports.flags.VERIFY_DISCOURAGE_UPGRADABLE_WITNESS_PROGRAM;
+  | exports.flags.VERIFY_DISCOURAGE_UPGRADABLE_WITNESS_PROGRAM
+  | exports.flags.VERIFY_WITNESS_PUBKEYTYPE;
 
 /**
  * Standard-not-mandatory flags.
diff --git a/lib/script/script.js b/lib/script/script.js
index 54341c48..feef16eb 100644
--- a/lib/script/script.js
+++ b/lib/script/script.js
@@ -978,7 +978,7 @@ Script.prototype.execute = function execute(stack, flags, tx, index, version) {
           subscript.removeData(sig);
 
         Script.validateSignature(sig, flags);
-        Script.validateKey(key, flags);
+        Script.validateKey(key, flags, version);
 
         if (sig.length > 0) {
           type = sig[sig.length - 1];
@@ -1057,7 +1057,7 @@ Script.prototype.execute = function execute(stack, flags, tx, index, version) {
           key = stack.top(-ikey);
 
           Script.validateSignature(sig, flags);
-          Script.validateKey(key, flags);
+          Script.validateKey(key, flags, version);
 
           if (sig.length > 0) {
             type = sig[sig.length - 1];
@@ -2713,7 +2713,7 @@ Script.isDummy = function isDummy(data) {
  * @throws {ScriptError}
  */
 
-Script.validateKey = function validateKey(key, flags) {
+Script.validateKey = function validateKey(key, flags, version) {
   if (flags == null)
     flags = constants.flags.STANDARD_VERIFY_FLAGS;
 
@@ -2724,6 +2724,31 @@ Script.validateKey = function validateKey(key, flags) {
       throw new ScriptError('PUBKEYTYPE');
   }
 
+  if (version === 1) {
+    if (flags & constants.flags.VERIFY_WITNESS_PUBKEYTYPE) {
+      if (!Script.isCompressedEncoding(key))
+        throw new ScriptError('WITNESS_PUBKEYTYPE');
+    }
+  }
+
+  return true;
+};
+
+/**
+ * Test whether the data element is a compressed key.
+ * @param {Buffer} key
+ * @returns {Boolean}
+ */
+
+Script.isCompressedEncoding = function isCompressedEncoding(key) {
+  assert(Buffer.isBuffer(key));
+
+  if (key.length !== 33)
+    return false;
+
+  if (key[0] !== 0x02 && key[0] !== 0x03)
+    return false;
+
   return true;
 };