{
  "manageEntity": {
    "action": "Save",
    "entityId": "291623",
    "entityType": "Track",
    "nonce": "1785345174499443114",
    "signature": "0xdb70a5e8552200a9a372c71cd0230dab254ced0cd24d16aa144c2cbdf3705eb54c488019a6a28d046e632c15ef63146b450912fd3225425e5a3b2b14c808bda61b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}