{
  "manageEntity": {
    "action": "Save",
    "entityId": "680570",
    "entityType": "Track",
    "nonce": "0xfe2c2dacd42a40ee0772c8b1d59d43a7ee24989347a1a140e5d648bcc9e7dd14",
    "signature": "0x8c932c44bf4be1fa8639bd62f7b3b5a32d573ffb67f9b01bf6f770a09d8aaf5a4a7cafece4697dfea3d3be561353a55ed125b72b8a88e93639523716992fcf7a1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}