{
  "manageEntity": {
    "action": "Save",
    "entityId": "1663882561",
    "entityType": "Track",
    "nonce": "0xc91e16b41f68cf37982e93c4b716c59d45393f11009328ba49b229320dc1617f",
    "signature": "0x43a75b0d0911fc495ceaa28877cbd21f5f03e9248a44406e2622fe08c2bc4c5f6919ae2564e4cf263c0de31a4038b69bce115f693e917b9174a1e8f34bd9e3841c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}