fix: p2pk output serialisation

lib/bitcoin.py

@@ -357,6 +357,10 @@ def address_to_scripthash(addr):
     h = sha256(bytes.fromhex(script))[0:32]
     return bytes(reversed(h)).hex()
 
+def public_key_to_p2pk_script(pubkey):
+    script = push_script(pubkey)
+    script += 'ac'                                           # op_checksig
+    return script
 
 __b58chars = b'123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
 assert len(__b58chars) == 58