{
  "manageEntity": {
    "action": "Save",
    "entityId": "1904718683",
    "entityType": "Track",
    "nonce": "0x47b1437ad12612e876eea9f35483bedaa2a2ce982a3b8cb82a0faae468a5b9e5",
    "signature": "0x3b6b2a66345bafbe3610a0caf87ec2400e9077bca2f7ac0122ab0e230c0e5cef7177a011b7467d17b23f53591445a107a8b1270653f31418bdd22195c42499d51c",
    "signer": "0x7425EdbFdF528603A88c658f4cf8B1396a8a77F5",
    "userId": "406225571"
  }
}