{
  "manageEntity": {
    "action": "Save",
    "entityId": "506753",
    "entityType": "Track",
    "nonce": "0xf424b661febfce7c4b6bf1d7f4a96f673386ae73c695cfd6908f1f82aa6ea985",
    "signature": "0xad16ff15f3ae49de10fb9e020c19f6774c7235a9dfd0c0f087ca7d7e19bd9a2e1ece27f9651be973ea17856a022514969d0bd8ebfa265254b4ded5550b9049951b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}