Add address->scripthash conversion tool

contrib/script_hash.py

@@ -0,0 +1,31 @@
+#!/usr/bin/env python3
+import argparse
+import datetime
+import hashlib
+import io
+import sys
+
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--network', default='mainnet')
+    args = parser.parse_args()
+
+    if args.network == 'regtest':
+        from pycoin.symbols.xrt import network
+    elif args.network == 'testnet':
+        from pycoin.symbols.xtn import network
+    elif args.network == 'mainnet':
+        from pycoin.symbols.btc import network
+    else:
+        raise ValueError(f"unknown network: {args.network}")
+
+    for line in sys.stdin:
+        addr = line.strip()
+        script = network.parse.address(addr).script()
+        script_hash = hashlib.sha256(script).digest()
+        print(script_hash[::-1].hex())
+
+
+if __name__ == '__main__':
+    main()

contrib/script_hash.sh

@@ -0,0 +1 @@
+venv_wrapper.sh