{
  "manageEntity": {
    "action": "Save",
    "entityId": "651755",
    "entityType": "Track",
    "nonce": "0xac75c540cf9620169e8aba31568662e56aca87289015dde8b3c85f1eae64505f",
    "signature": "0x7e9f73583d0f7ab209acd51387e80225827663bbaf487165bd909e7124b69bba48dc08a1f3a8b69b9fa504dfec7cc93922ecc1466a9d85070c83c331cc717ccd1c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}