/build/rpc / cosign / session

cosign.attest

cosign.attest "session_id" "address" ( "signature" ) BIP-322 peer attestation (two-step challenge/response flow). Step 1: Generate challenge cosign.attest session_id=<sid> address=<addr> Returns: {"challenge": "..."} Step 2: Verify signature First sign challenge: signmessage <address> <challenge> Then verify: cosign.attest session_id=<sid> address=<addr> signature=<sig> Returns: {"verified": true, "peer": {...}} Arguments: 1. session_id (string, required) Session ID 2. address (string, required) Bitcoin address to attest with 3. signature (string, optional) Base64 signature (for step 2) Result (Step 1 (challenge generation)): { (json object) "challenge" : "str" (string) Challenge string to sign } Result (Step 2 (signature verification)): { (json object) "verified" : true|false, (boolean) Whether signature was valid "peer" : { (json object) Verified peer info "address" : "str" (string) Peer's verified address } } Examples: Step 1: Generate challenge > bitcoin-cli cosign.attest "session_abc123" "bc1q..." Step 2: Sign challenge > bitcoin-cli signmessage "bc1q..." "cosign|session_abc123|word1-word2-..." Step 3: Verify signature > bitcoin-cli cosign.attest "session_abc123" "bc1q..." "signature_base64"

Signature

cosign.attest(session_id: string, address: string, signature?: string) → any

Code samples

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

bitcoin-cli cosign.attest "session_abc123" "bc1q..."

bitcoin-cli signmessage "bc1q..." "cosign|session_abc123|word1-word2-..."

bitcoin-cli cosign.attest "session_abc123" "bc1q..." "signature_base64"

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

Parameters

Name	Type	Req.	Description
session_id	`string`	yes	Session ID
address	`string`	yes	Bitcoin address to attest with
signature	`string`	—	Base64 signature (for step 2) Result (Step 1 (challenge generation)): { (json object) "challenge" : "str" (string) Challenge string to sign } Result (Step 2 (signature verification)): { (json object) "verified" : true\|false, (boolean) Whether signature was valid "peer" : { (json object) Verified peer info "address" : "str" (string) Peer's verified address } }

Result

Type: any

No `Result:` section in live help output.

Source: services/core-node/bcore/src/rpc/cosign.cpp:949

C++ symbol: cosign_attest

Code samples

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

bitcoin-cli cosign.attest "session_abc123" "bc1q..."

bitcoin-cli signmessage "bc1q..." "cosign|session_abc123|word1-word2-..."

bitcoin-cli cosign.attest "session_abc123" "bc1q..." "signature_base64"

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