{
  "manageEntity": {
    "action": "Save",
    "entityId": "545857",
    "entityType": "Track",
    "nonce": "0xd654c63cc9646dfe1866e715c4388433d80b1f08720535d251d11bdcc5bbf189",
    "signature": "0x20e6c68cfd8af5ba7de21e937806c4d995928286fcd7db88b3c80cac92a7011634d015a95b02ae44f1367604d0edc950994eb4ff75f05c09ea4e791071814bb41b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}