forward.sign_over_channel

workflowforward-lifecycle·step 5 of 10Workflow: forward-lifecycle · step 5 of 10

forward.sign_over_channel "session_id" "psbt" ( is_initiator ) Coordinate Fair-Sign ceremony over an active cosign session. Sends nonce commitments, exchanges partial signatures, and completes the signing process. Arguments: 1. session_id (string, required) Active cosign session identifier 2. psbt (string, required) Partially Signed Bitcoin Transaction (base64) 3. is_initiator (boolean, optional) Whether this party initiates the ceremony (default: true) Result: { (json object) "psbt" : "str", (string) Completed PSBT with all signatures (base64) "ceremony_stats" : { (json object) Ceremony statistics "messages_sent" : n, (numeric) Number of messages sent "messages_received" : n, (numeric) Number of messages received "duration_ms" : n (numeric) Ceremony duration in milliseconds } } Examples: > bitcoin-cli forward.sign_over_channel "69d967c0e415c9a3" "cHNidP8BA..." true

Signature

forward.sign_over_channel(session_id: string, psbt: string, is_initiator?: boolean) → any

Code samples

curl --user "$RPC_USER:$RPC_PASS" \
  --data-binary '{"jsonrpc":"1.0","id":"docs","method":"forward.sign_over_channel","params":["\"<session_id>\"","\"<psbt>\"",false]}' \
  -H 'content-type: text/plain;' \
  http://127.0.0.1:8332/

bitcoin-cli forward.sign_over_channel "69d967c0e415c9a3" "cHNidP8BA..." true

import requests
r = requests.post(
    "http://127.0.0.1:8332/",
    auth=("$RPC_USER", "$RPC_PASS"),
    json={
        "jsonrpc": "1.0",
        "id": "docs",
        "method": "forward.sign_over_channel",
        "params": ["\"<session_id>\"", "\"<psbt>\"", false],
    },
    timeout=30,
)
print(r.json())

const res = await fetch("http://127.0.0.1:8332/", {
  method: "POST",
  headers: {
    "content-type": "application/json",
    "authorization": "Basic " + btoa(`${process.env.RPC_USER}:${process.env.RPC_PASS}`),
  },
  body: JSON.stringify({
    jsonrpc: "1.0",
    id: "docs",
    method: "forward.sign_over_channel",
    params: ["\"<session_id>\"","\"<psbt>\"",false],
  }),
});
console.log(await res.json());

Parameters

Name	Type	Req.	Description
session_id	`string`	yes	Active cosign session identifier
psbt	`string`	yes	Partially Signed Bitcoin Transaction (base64)
is_initiator	`boolean`	—	Whether this party initiates the ceremony (default: true)

Result

Type: any

{ (json object) "psbt" : "str", (string) Completed PSBT with all signatures (base64) "ceremony_stats" : { (json object) Ceremony statistics "messages_sent" : n, (numeric) Number of messages sent "messages_received" : n, (numeric) Number of messages received "duration_ms" : n (numeric) Ceremony duration in milliseconds } }

Source: services/core-node/bcore/src/wallet/rpc/contracts.cpp:14419

C++ symbol: forward_sign_over_channel

Code samples

curl --user "$RPC_USER:$RPC_PASS" \
  --data-binary '{"jsonrpc":"1.0","id":"docs","method":"forward.sign_over_channel","params":["\"<session_id>\"","\"<psbt>\"",false]}' \
  -H 'content-type: text/plain;' \
  http://127.0.0.1:8332/

bitcoin-cli forward.sign_over_channel "69d967c0e415c9a3" "cHNidP8BA..." true

import requests
r = requests.post(
    "http://127.0.0.1:8332/",
    auth=("$RPC_USER", "$RPC_PASS"),
    json={
        "jsonrpc": "1.0",
        "id": "docs",
        "method": "forward.sign_over_channel",
        "params": ["\"<session_id>\"", "\"<psbt>\"", false],
    },
    timeout=30,
)
print(r.json())

const res = await fetch("http://127.0.0.1:8332/", {
  method: "POST",
  headers: {
    "content-type": "application/json",
    "authorization": "Basic " + btoa(`${process.env.RPC_USER}:${process.env.RPC_PASS}`),
  },
  body: JSON.stringify({
    jsonrpc: "1.0",
    id: "docs",
    method: "forward.sign_over_channel",
    params: ["\"<session_id>\"","\"<psbt>\"",false],
  }),
});
console.log(await res.json());