combine_psbt.py

Author: JAGADISHSUNILPEDNEKAR

examples/combine_psbt.py

@@ -0,0 +1,43 @@
+#!/usr/bin/env python3
+
+"""
+Combine multiple PSBTs (Partially Signed Bitcoin Transactions) into a single PSBT with merged signatures and metadata.
+
+This script performs the combiner role defined in BIP-174, allowing multiple signers to contribute signatures separately,
+and then merge their PSBTs into one unified transaction.
+
+Features:
+- Loads multiple base64-encoded PSBTs
+- Merges all inputs, outputs, and partial signatures
+- Validates consistency across PSBTs before combining
+- Outputs a single combined PSBT in base64 format
+
+Usage:
+    python combine_psbt.py <psbt1_base64> <psbt2_base64> [<psbt3_base64> ...]
+
+Returns:
+    Combined PSBT with merged data from all inputs
+"""
+
+import sys
+from bitcoinutils.setup import setup
+from bitcoinutils.psbt import PSBT
+
+def main():
+    setup('testnet')
+    
+    if len(sys.argv) < 3:
+        print("Usage: python combine_psbt.py <psbt1_base64> <psbt2_base64> [psbt3_base64] ...")
+        return
+    
+    # Load PSBTs from command line arguments
+    psbts = [PSBT.from_base64(psbt_base64) for psbt_base64 in sys.argv[1:]]
+    
+    # Combine all PSBTs using the first one as base
+    combined_psbt = psbts[0].combine_psbts(psbts[1:])
+    
+    # Output the combined PSBT
+    print(combined_psbt.to_base64())
+
+if __name__ == "__main__":
+    main()