Merge pull request #116 from JAGADISHSUNILPEDNEKAR/feature/add-checksigadd-opcode

Add OP_CHECKSIGADD opcode support for Taproot script paths

Author: karask

bitcoinutils/script.py

@@ -126,11 +126,13 @@
     "OP_CHECKSIGVERIFY": b"\xad",
     "OP_CHECKMULTISIG": b"\xae",
     "OP_CHECKMULTISIGVERIFY": b"\xaf",
+    "OP_CHECKSIGADD": b"\xba",             # added this new OPCODE
     # locktime
     "OP_NOP2": b"\xb1",
     "OP_CHECKLOCKTIMEVERIFY": b"\xb1",
     "OP_NOP3": b"\xb2",
     "OP_CHECKSEQUENCEVERIFY": b"\xb2",
+    
 }
 
 CODE_OPS = {
@@ -221,6 +223,7 @@
     b"\xad": "OP_CHECKSIGVERIFY",
     b"\xae": "OP_CHECKMULTISIG",
     b"\xaf": "OP_CHECKMULTISIGVERIFY",
+    b"\xba": "OP_CHECKSIGADD", # added this new OPCODE
     # locktime
     b"\xb1": "OP_NOP2",
     b"\xb1": "OP_CHECKLOCKTIMEVERIFY",

tests/test_checksigadd.py

@@ -0,0 +1,12 @@
+import unittest
+from bitcoinutils.script import Script
+
+class TestCheckSigAdd(unittest.TestCase):
+    def test_checksigadd_opcode(self):
+        # Create a script with the new opcode
+        script = Script(["OP_CHECKSIGADD"])
+        # Check if it serializes correctly to hex
+        self.assertEqual(script.to_hex(), "ba")
+
+if __name__ == "__main__":
+    unittest.main()