{
  "manageEntity": {
    "action": "Save",
    "entityId": "1998752381",
    "entityType": "Track",
    "nonce": "0xd8e29383780b8f748d466bc831061aea4ef4a37d37bd1de31ddae47f268d4308",
    "signature": "0xb8a8699c66646a51289a9377d16387c65b4062f1b9bca5ccc77629e8fd62a1277f4224f231e510d237f7d0f9e9a9a9b86ef4c614931d997972d9f2a6080926941b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}