{
  "manageEntity": {
    "action": "Save",
    "entityId": "1618279634",
    "entityType": "Track",
    "nonce": "1786352463073778406",
    "signature": "0x351778e382fb23d7ca29e2b5b5caaf302a5fb0b3f3a57d6a3d544f736d55116958324796d7a66a4429be33a74fda1f04c507c063be7a9d536098fa82b60c45fb1c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}