{
  "manageEntity": {
    "action": "Save",
    "entityId": "643215143",
    "entityType": "Track",
    "nonce": "0x42758a9ed980b2dfe5fec643b14f4943403b2612a819c8f6b70a35394b8b0607",
    "signature": "0xf846367babbc7be93a77df93ef7dcfffec6cb198087796b3949f8a67b6803174036d1782577cc2b2a65a7cf8abbefb3ab961ff64e852b4e249a620b9cbe00fb61b",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}