{
  "manageEntity": {
    "action": "Save",
    "entityId": "1366049595",
    "entityType": "Track",
    "nonce": "1787798902443015796",
    "signature": "0x1be5ca29dec8f150364515a53086e6ba74c29ad69f7b79f0671be023c62e46330c0bea87d8a656cd877f8e6acd5a8d9f1c877c9293fd2d6e8ee49c9f28bbc9d51c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}