{
  "manageEntity": {
    "action": "Save",
    "entityId": "498091706",
    "entityType": "Track",
    "nonce": "0xfa2b7ea23ea5866e474c96a066bc37a484b5a2371811f5a980b93743f0c516ca",
    "signature": "0x29026d4af29cd76fd387a224bb0b1d9a2addac6e76be99ca3d40977bc0fbafd71ff7606a0a894d81dfffdbfcff656f0c78a9d6400de51033198a4b9a0b85e6f81b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}