{
  "manageEntity": {
    "action": "Save",
    "entityId": "246392150",
    "entityType": "Track",
    "nonce": "1789884893188089994",
    "signature": "0x0a8981274f63bff31002483afe33f792fffed4c4b4569ecd841bf508b514e0143f64399e232f6078d0eb6b37b8020113485933c027068bfa9297fce3ccca31ea1c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}