{
  "manageEntity": {
    "action": "Save",
    "entityId": "38548854",
    "entityType": "Track",
    "nonce": "0xa8daca99d6812e38cf73bdaa92d4ce7b2d9e032a494ce5a9c4c345af378c7115",
    "signature": "0xd4728e01caa75eedc180695d4edf5135f4e4bdaadaf85cb9edf3d6dce5ce28c152bf1b64844bebb17b11d820cf80fcbc024faf4e916e52d6da2eef2e753183971c",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}