{
  "manageEntity": {
    "action": "Save",
    "entityId": "250024",
    "entityType": "Track",
    "nonce": "0xb31f01f7cee81b16b1dd6be56c925bd2b97cc210c7e531642fe202557a0dba86",
    "signature": "0xc1a518ed9f55487abf6c6fbe9bc9f404853f4d4a7be3e591a9b6ebc09291d59d16d9aa6d38c113307eaf2be18cdc7a38babc62fd0a36f4164be5953ac7c57edc1b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}