{
  "manageEntity": {
    "action": "Save",
    "entityId": "2138821456",
    "entityType": "Track",
    "nonce": "0x749fb52b2cef17be21ff24e0cfe4cd99f7cd3db73f1c54b4d753976823844c6d",
    "signature": "0x742d19021b23415999c311466b0ad9317117470112f42f5d14c1d92fb9cbece07b0f7df250b5e6419179d1b462e0c58ebb4e1e64a67ec9616a762eb8031a81631b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}