{
  "manageEntity": {
    "action": "Save",
    "entityId": "1668436653",
    "entityType": "Track",
    "nonce": "0xb721f8ce671371e492fc876d76fff9c1c401f58c5688f30815341b0a6f72fe03",
    "signature": "0xca3d735a2eb94b63c3dc677083b1612f668ee89b7675c07f9334e614beb97523739f439c439b7c0d884190ad5f77ef6dc0b38fc9ecc8d3122b25ae7fef4273c81c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}