{
  "manageEntity": {
    "action": "Save",
    "entityId": "448603",
    "entityType": "Track",
    "nonce": "0x02532d7be3be52179610b2604463229aee4b9dee692920fa51bb0ce58031305c",
    "signature": "0x35d8a7c8245b601eb100bf6db46cb6299bde2189af0c21d8194b0b6052e2008748cc762d63e03ce10349bb95cb10ec9a5574a57e1731122a1c8ff7bdaa5cfdda1b",
    "signer": "0xB755CddA6da08Cbad290b9528CD0dC860f9f7dd5",
    "userId": "536791428"
  }
}