{
  "manageEntity": {
    "action": "Save",
    "entityId": "854761",
    "entityType": "Track",
    "nonce": "0x0fdc8df40dd7adf92a67f7767c04071fc79b5b21fd356c1362825962c68d2c58",
    "signature": "0x3a9dcf05defae88b6e723c87d3694b6edb76601e17c92cf41f0ce3ba3aaf49f0416a5bc49448cfb897aa87bcbeb8d9324d9c72c17b80b1836c10604d93f697881c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}