{
  "manageEntity": {
    "action": "Save",
    "entityId": "838137456",
    "entityType": "Track",
    "nonce": "0xcca88c59dcb2127e36b61168f8964419410b4d7a92f6b4033f21e08ab377e60f",
    "signature": "0x9a760df5ba6b75dc8ced92c8a7971640053cf2cd4859fa90c714916f8a1f18234aaf4fd8cc19369e7da9d965fcdfdb36f0dc62de0cbe5569974fff5c78b8e4c61b",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}