multisig example

python/examples/transactions/multisig.py

@@ -0,0 +1,85 @@
+# A very simple non-PSKT multisig example
+
+import asyncio
+from kaspa import (
+    Mnemonic,
+    Opcodes,
+    RpcClient,
+    Resolver,
+    ScriptBuilder,
+    SighashType,
+    XPrv,
+    create_transactions,
+    address_from_script_public_key,
+    kaspa_to_sompi
+)
+
+def derive(seed, account_index):
+    xprv = XPrv(seed).derive_path(f"m/45'/111111'/{account_index}'")
+    xpub = xprv.to_xpub()
+    prv = xprv.derive_child(1).to_private_key()
+    pub = xpub.derive_child(1).to_public_key()
+    return prv, pub
+
+async def main():
+    seed = Mnemonic('predict cloud noise economy home stereo tag cancel adult pistol act remove equip cricket man summer neutral black art miracle foam world clown say').to_seed()
+
+    prv1, pub1 = derive(seed, 0)
+    print(f'Account 1:\n - prv: {prv1.to_string()}\n - pub: {pub1.to_string()}\n')
+
+    prv2, pub2 = derive(seed, 1)
+    print(f'Account 2:\n - prv: {prv2.to_string()}\n - pub: {pub2.to_string()}\n')
+
+    prv3, pub3 = derive(seed, 2)
+    print(f'Account 3:\n - prv: {prv3.to_string()}\n - pub: {pub3.to_string()}\n')
+
+    redeem_script = ScriptBuilder()\
+        .add_i64(2)\
+        .add_data(pub1.to_x_only_public_key().to_string())\
+        .add_data(pub2.to_x_only_public_key().to_string())\
+        .add_data(pub3.to_x_only_public_key().to_string())\
+        .add_i64(3)\
+        .add_op(Opcodes.OpCheckMultiSig)
+
+    # TODO ECDSA version
+    # TODO include create_multisig_address function when available
+
+    spk = redeem_script.create_pay_to_script_hash_script()
+    address = address_from_script_public_key(spk, network="testnet")
+    print(f"Multisig Address: {address.to_string()}\n")
+
+    proceed = input("Send funds to address above before proceeding (enter 'y' to proceed): ")
+    if proceed != 'y':
+        return
+
+    client = RpcClient(resolver=Resolver(), network_id='testnet-10')
+    await client.connect(strategy='fallback')
+    utxos = await client.get_utxos_by_addresses(request={'addresses': [address]})
+
+    tx = create_transactions(
+        entries=utxos['entries'],
+        outputs=[{'address': 'kaspatest:prsajwtrefzex5wsmyk3rfkyzaq3wdwzczzr6jptgyzk4pacl9lzvtv8h30j9', 'amount': kaspa_to_sompi(1)}],
+        change_address=address,
+        priority_fee=kaspa_to_sompi(1),
+        network_id='testnet-10',
+        minimum_signatures=2,
+        sig_op_count=3
+    )
+
+    for transaction in tx['transactions']:
+        for idx, _ in enumerate(transaction.transaction.inputs):
+
+            sig_1 = transaction.create_input_signature(idx, prv1)
+            sig_2 = transaction.create_input_signature(idx, prv2)
+
+            script_sig = ScriptBuilder()\
+                .add_data(sig_1[2:])\
+                .add_data(sig_2[2:])\
+                .add_data(redeem_script.to_string())
+
+            transaction.fill_input(idx, script_sig.to_string())
+
+        print('tx id', await transaction.submit(client))
+
+if __name__ == "__main__":
+    asyncio.run(main())