Sign Frost Spark

Perform pure FROST partial signing for a Spark wallet. Produces partial signatures without constructing operator packages.

type · enum<string> · required

Enum options: ACTIVITY_TYPE_SPARK_SIGN_FROST

timestampMs · string · required

Timestamp (in milliseconds) of the request, used to verify liveness of user requests.

organizationId · string · required

Unique identifier for a given Organization.

parameters · object · required

The parameters object containing the specific intent data for this activity.

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parameters.signatures · array · required

Batched sign requests. Each produces a partial signature plus Turnkey’s public commitments.

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parameters.signatures.derivation · object · required

derivation field

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parameters.signatures.derivation.signingLeaf · object

signingLeaf field

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parameters.signatures.derivation.staticDeposit · object

staticDeposit field

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parameters.signatures.operatorCommitments · array · required

Commitments for every non-Turnkey participant. MUST NOT include an entry under Turnkey’s identifier. Bound into the nonce HMAC.

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A successful response returns the following fields:

activity · object · required

The activity object containing type, intent, and result

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cURL

curl --request POST \
  --url https://api.turnkey.com/public/v1/submit/spark_sign_frost \
  --header 'Accept: application/json' \
  --header 'Content-Type: application/json' \
  --header "X-Stamp: <string> (see Authorizations)" \
  --data '{
    "type": "ACTIVITY_TYPE_SPARK_SIGN_FROST",
    "timestampMs": "<string> (e.g. 1746736509954)",
    "organizationId": "<string> (Your Organization ID)",
    "parameters": {
        "signWith": "<string>",
        "signatures": [
            {
                "derivation": {
                    "identity": "<object>",
                    "signingLeaf": {
                        "leafId": "<string>"
                    },
                    "deposit": "<object>",
                    "staticDeposit": {
                        "index": "<number>"
                    },
                    "htlcPreimage": "<object>"
                },
                "message": "<string>",
                "verifyingKey": "<string>",
                "operatorCommitments": [
                    {
                        "id": "<string>",
                        "hiding": "<string>",
                        "binding": "<string>"
                    }
                ],
                "adaptorPublicKey": "<string>"
            }
        ]
    }
}'

import { Turnkey } from "@turnkey/sdk-server";

const turnkeyClient = new Turnkey({
  apiBaseUrl: "https://api.turnkey.com",
  apiPublicKey: process.env.API_PUBLIC_KEY!,
  apiPrivateKey: process.env.API_PRIVATE_KEY!,
  defaultOrganizationId: process.env.ORGANIZATION_ID!,
});

const response = await turnkeyClient.apiClient().sparkSignFrost({
  signWith: "<string> (A Spark wallet account address identifying the wallet to sign with.)",
  signatures: [{ // Batched sign requests. Each produces a partial signature plus Turnkey's public commitments.,
    derivation: { // derivation field,
      identity: { /* object */ } // identity field,
      signingLeaf: { // signingLeaf field,
        leafId: "<string> (Unique identifier for the Spark signing leaf.)",
      },
      deposit: { /* object */ } // deposit field,
      staticDeposit: { // staticDeposit field,
        index: 0 // Index used to derive the static deposit key.,
      },
      htlcPreimage: { /* object */ } // htlcPreimage field,
    },
    message: "<string> (Hex-encoded 32-byte sighash to sign.)",
    verifyingKey: "<string> (Aggregate group verifying key (hex-encoded compressed secp256k1 point), computed as P_ops + P_user. Bound into the nonce HMAC.)",
    operatorCommitments: [{ // Commitments for every non-Turnkey participant. MUST NOT include an entry under Turnkey's identifier. Bound into the nonce HMAC.,
      id: "<string> (FROST participant identifier, hex-encoded (32-byte scalar).)",
      hiding: "<string> (Hiding commitment D, hex-encoded compressed secp256k1 point.)",
      binding: "<string> (Binding commitment E, hex-encoded compressed secp256k1 point.)",
    }],
    adaptorPublicKey: "<string> (Optional adaptor point T (hex-encoded 33-byte compressed secp256k1 pubkey). When set, Turnkey produces a Schnorr adaptor pre-signature with the FROST challenge bound to `R+T` (where `R` is the aggregate group nonce commitment from FROST). The party holding the discrete log `t` completes the pre-sig to a valid BIP-340 signature by adding `t` (or `-t`, for parity) to the signature scalar `s`. This is primarily used by Spark leaves-swap and other adaptor-bound flows; absent or empty leads to plain FROST signing (the typical case).)",
  }]
});

200

{
  "activity": {
    "id": "<activity-id>",
    "status": "ACTIVITY_STATUS_COMPLETED",
    "type": "ACTIVITY_TYPE_SPARK_SIGN_FROST",
    "organizationId": "<organization-id>",
    "timestampMs": "<timestamp> (e.g. 1746736509954)",
    "result": {
      "activity": {
        "id": "<string>",
        "organizationId": "<string>",
        "status": "<string>",
        "type": "<string>",
        "intent": {
          "sparkSignFrostIntent": {
            "signWith": "<string>",
            "signatures": [
              {
                "derivation": {
                  "identity": "<object>",
                  "signingLeaf": {
                    "leafId": "<string>"
                  },
                  "deposit": "<object>",
                  "staticDeposit": {
                    "index": "<number>"
                  },
                  "htlcPreimage": "<object>"
                },
                "message": "<string>",
                "verifyingKey": "<string>",
                "operatorCommitments": [
                  {
                    "id": "<string>",
                    "hiding": "<string>",
                    "binding": "<string>"
                  }
                ],
                "adaptorPublicKey": "<string>"
              }
            ]
          }
        },
        "result": {
          "sparkSignFrostResult": {
            "signatures": [
              {
                "signatureShare": "<string>",
                "hiding": "<string>",
                "binding": "<string>"
              }
            ]
          }
        },
        "votes": "<array>",
        "fingerprint": "<string>",
        "canApprove": "<boolean>",
        "canReject": "<boolean>",
        "createdAt": "<string>",
        "updatedAt": "<string>"
      }
    }
  }
}