{
  "manageEntity": {
    "action": "Save",
    "entityId": "668884497",
    "entityType": "Track",
    "nonce": "0x4241a472a19e0f0ca56085042627bd60534415577b6f71a9b383e085b481d85a",
    "signature": "0xa866530008c75c310df20fa3ee3ce2784935c479b0509806545d79095e08cc72226b750c60476db5d2b54b46a89689e7a4d6dec7baf46e22e99cda19bdbec4061b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}