{
  "manageEntity": {
    "action": "Save",
    "entityId": "428397",
    "entityType": "Track",
    "nonce": "0x01030862ca6f0420b11437e6f2627e94af1d1d2cda3ed31ac6a0ec8b436b9f01",
    "signature": "0x287ed8dcc8f2fecd0bad98e41feff6a1cf41f395680a56d7a239d678d1dcda27254a76d9f08e8a1c146cdfe7d00b1211a61fb642f1d94c74c0291752966e12111c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}