{
  "manageEntity": {
    "action": "Save",
    "entityId": "745757118",
    "entityType": "Track",
    "nonce": "0x70e276fb675ff94c2e949c92b3ec8091c15cd1519a321ecfd67379ef199c3d32",
    "signature": "0xddb457b55920b2be7b07e3ea3d3845148906995a78a52314848cd43b43e8010d0825259fecf74313856878b6cf016054a9d91f0ca4ad804db771c1153344f9fa1c",
    "signer": "0x6068Da6B0a791A756931bE32de98D46eBb95890c",
    "userId": "475275462"
  }
}