{
  "manageEntity": {
    "action": "Save",
    "entityId": "321799258",
    "entityType": "Track",
    "nonce": "0x44c9b63dfd9b2f7471fd3179a5ed62fdaba7c420209601e9408607c610973af3",
    "signature": "0x901bb3e2d392dd0a2799100a0eb87d9906a0d48e1c1e0f28e3dbee34cd7d07f767dd2403c9344874d10743c4822eb9c2407674b2c5188da83f78a3a95208aa401b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}