{
  "manageEntity": {
    "action": "Save",
    "entityId": "454690",
    "entityType": "Track",
    "nonce": "0xd268f848d01c99bbaf57226612dde95cfbcbb4b921cce38684c5371eb56336ee",
    "signature": "0xd0e321d1037a4dff314971c8fae4f680fb73a49620009c6c58cdd9f9076bd67e4cc41a671d349f67c6971c7761e9e6969a33e1fc91de7df1ac61084b31fed17a1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}