{
  "manageEntity": {
    "action": "Save",
    "entityId": "250937",
    "entityType": "Track",
    "nonce": "0x3b44505050b8d2c64038ddba6e84217f28b7cd3b15aa80283ea0e0997284f58c",
    "signature": "0x7dbbfe14730742dd92a228ce9c32038dc764f82feeb36e56b5d08a2a6892d7723e8d41349cb49eb26ffb527c9c5c3034674b8ba4f07901e044fadf7d473fc49a1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}