{
  "manageEntity": {
    "action": "Save",
    "entityId": "646050547",
    "entityType": "Track",
    "nonce": "1789929958743703699",
    "signature": "0x13528cfdf02b2f1f02f32d1058265782f87754c8048a0b217ee8d47df35677f40c8d2bd8abea95b098188b019499ec480844ddde2a394a5c387a716d2395477e1b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}