{
  "manageEntity": {
    "action": "Save",
    "entityId": "998525505",
    "entityType": "Track",
    "nonce": "0x3fa3e0ef7c16d757ab4ccc708823d7b0a69417c39bec664c183b0f43943d4a32",
    "signature": "0xcac61e4087b2fe84a974f731659ad2ab33f1ec457de9ac932733259e43750fcd06b8a42a7683fea06f1d13194b6a489cc179860e853f5434abb7dda8184b74c61c",
    "signer": "0x67479063A246B10560F7FfC48Dba47268867417B",
    "userId": "745004514"
  }
}