{
  "manageEntity": {
    "action": "Save",
    "entityId": "1646876497",
    "entityType": "Track",
    "nonce": "0x214e29fe4bcdc142e54c03070a289cdcaf4c5a520b388e664d27a796e644d1e1",
    "signature": "0xda977de405a6ce1e9a0c47b6b040173022040a0a186ff81089c24917364a00e94bb3795f7a2f9dc341641820e58c00a03285f44dd091eda3970dfc487498b35a1b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}