/build/rpc / cosign / session

cosign.adaptor_roundtrip

cosign.adaptor_roundtrip "session_id" "psbt" is_initiator Automate complete adaptor signature ceremony over cosign channel (Phase 4 §5.8). This is the PRIMARY ceremony helper that orchestrates all 3 phases: 1. PREPARE: Generate nonces/commitments, exchange via cosign 2. PARTIAL: Create partial signatures, exchange via cosign 3. COMPLETE: Finalize PSBT with adaptor signatures SECURITY: Handshake must be complete before calling (use cosign.handshake_auto first). IMPORTANT: Both parties must call this simultaneously (initiator and responder roles). Arguments: 1. session_id (string, required) Active cosign session ID (after handshake) 2. psbt (string, required) Partially Signed Bitcoin Transaction (base64) 3. is_initiator (boolean, required) Whether this party initiates ceremony Result: { (json object) "psbt" : "str", (string) Completed PSBT with all signatures (base64) "complete" : true|false, (boolean) Whether ceremony completed successfully "messages_sent" : n, (numeric) Number of messages sent "messages_received" : n (numeric) Number of messages received } Examples: Borrower (initiator) automates ceremony > bitcoin-cli cosign.adaptor_roundtrip "abc123..." "cHNidP8BA..." true Lender (responder) automates ceremony > bitcoin-cli cosign.adaptor_roundtrip "abc123..." "cHNidP8BA..." false

Signature

cosign.adaptor_roundtrip(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":"cosign.adaptor_roundtrip","params":["\"<session_id>\"","\"<psbt>\"",false]}' \
  -H 'content-type: text/plain;' \
  http://127.0.0.1:8332/

bitcoin-cli cosign.adaptor_roundtrip "abc123..." "cHNidP8BA..." true

bitcoin-cli cosign.adaptor_roundtrip "abc123..." "cHNidP8BA..." false

import requests
r = requests.post(
    "http://127.0.0.1:8332/",
    auth=("$RPC_USER", "$RPC_PASS"),
    json={
        "jsonrpc": "1.0",
        "id": "docs",
        "method": "cosign.adaptor_roundtrip",
        "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: "cosign.adaptor_roundtrip",
    params: ["\"<session_id>\"","\"<psbt>\"",false],
  }),
});
console.log(await res.json());

Parameters

Name	Type	Req.	Description
session_id	`string`	yes	Active cosign session ID (after handshake)
psbt	`string`	yes	Partially Signed Bitcoin Transaction (base64)
is_initiator	`boolean`	yes	Whether this party initiates ceremony

Result

Type: any

{ (json object) "psbt" : "str", (string) Completed PSBT with all signatures (base64) "complete" : true|false, (boolean) Whether ceremony completed successfully "messages_sent" : n, (numeric) Number of messages sent "messages_received" : n (numeric) Number of messages received }

Source: services/core-node/bcore/src/rpc/cosign.cpp:1442

C++ symbol: cosign_adaptor_roundtrip

Code samples

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

bitcoin-cli cosign.adaptor_roundtrip "abc123..." "cHNidP8BA..." true

bitcoin-cli cosign.adaptor_roundtrip "abc123..." "cHNidP8BA..." false

import requests
r = requests.post(
    "http://127.0.0.1:8332/",
    auth=("$RPC_USER", "$RPC_PASS"),
    json={
        "jsonrpc": "1.0",
        "id": "docs",
        "method": "cosign.adaptor_roundtrip",
        "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: "cosign.adaptor_roundtrip",
    params: ["\"<session_id>\"","\"<psbt>\"",false],
  }),
});
console.log(await res.json());