{
  "manageEntity": {
    "action": "Save",
    "entityId": "257044711",
    "entityType": "Track",
    "nonce": "0xd3139de569d5504d83e613cf9ca7bcc0cab4c218ab7e2422d07c4bb0b5b28bae",
    "signature": "0x7682ba2f1b5cdf11d33fd04b62dc9df8888218e9b4ab717072e9b5d48b7d64652355dad7e3a25f0c1d55df26b6822a438b55af0752bce7d837af57080fd8a7231b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}