{
  "manageEntity": {
    "action": "Save",
    "entityId": "606393400",
    "entityType": "Track",
    "nonce": "1792511034019104868",
    "signature": "0xa4a98860ba6d9694e5f3554fc886ae9b085bdb73bf484d7cec8f5a37e7a4872b3560f0ceb1bb98a874a618df67f4f7d57b25d37451b1bd4ea645632f83341fe51b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}