{
  "manageEntity": {
    "action": "Save",
    "entityId": "268888525",
    "entityType": "Track",
    "nonce": "0x4f5f2f37eeedb45cee4337dd22b2029bde23110e948ae2023468c8508e207e4e",
    "signature": "0x46478589e40593cdea3239cea38bb009f14f47ab08afe3ff694ab39023df420f6d51590fce06ab250e269fac493268c4b5d9fb3c808e93175b12df9cbf6f218e1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}