{
  "manageEntity": {
    "action": "Save",
    "entityId": "699088307",
    "entityType": "Track",
    "nonce": "0xed519682871edb41498dcd71db80fc49308c8628910ac3773cf8ce2e3222b5a6",
    "signature": "0x6738ce2e214876ff9a336bd5913c8804350d15cd094ffdd86262767b1337243b0497cf46225e2628f270d47fa2da31dbfb75b3dba02056cd56b4cdbf5da3ff3a1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}