{
  "manageEntity": {
    "action": "Save",
    "entityId": "1490294624",
    "entityType": "Track",
    "nonce": "0x407222bdae383159970b22b1f8d5adbd3ae4ce9fde5a17a1da4c2ec62b37a634",
    "signature": "0xe801836329e163bb33f37a76d0d879bf06abf778f6b25d349b486966dc952c15640880bbf6fbaf7d33920a6eaeecd88c82579953f050adc3b577fd1e57759afe1b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}