{
  "manageEntity": {
    "action": "Save",
    "entityId": "1877816685",
    "entityType": "Track",
    "nonce": "0xdf519fab46558e05ecde47a9f7e1945003d71b5b819d470fad0f59bfceca2bef",
    "signature": "0x5aac3b9250b37c0f0d1ba3b8dbc792eb9a51acba1849ea536a0588e738b52b465553920ffa4206115244a08bce051c912b0aa6a1dadeed300d0076a29c8f02111b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}