{
  "manageEntity": {
    "action": "Save",
    "entityId": "1605946302",
    "entityType": "Track",
    "nonce": "0xd91319e5fd28aeb4c50b579afc0bcf81c636692a2447458e16d14cc119c1a73e",
    "signature": "0xe854494ef705b14a09a1ed644419e673138a55836d9788c856bb221a6af0e20602966ac79ffec4f642eb51acc3219975ac9c30ac8828a98769fc8001f520cb381b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}