{
  "manageEntity": {
    "action": "Save",
    "entityId": "521279305",
    "entityType": "Track",
    "nonce": "0x4065dffd0ef2a6b509f1ef6b09554191d95b504357e86d4b14a810b6a97c4df4",
    "signature": "0xa9e1add7a57b8c5d8778f398afc3764a2570266b5bc4a99e189272e4b92b59a44d6b197297a49fe7bf073215f6787af61a71a55ca92466614a16d4be06c4dbb01b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}