{
  "manageEntity": {
    "action": "Save",
    "entityId": "1516121046",
    "entityType": "Track",
    "nonce": "0x753f8bb7d7fa525107204eb2dc6356f6c689cd906cd124f06b3314612470c8d5",
    "signature": "0xe6ba6f200c1db4b17fbf63cf81c9cf30d67949b0768e96bf6c66317353e759e90e5f267925c11a36971321310685ed814a9afc9b2def557bb1f3c0e2e6b6c37f1b",
    "signer": "0x793bbEFbb3Cf1e6529B90296e502145aCcCDE8d6",
    "userId": "838777725"
  }
}