{
  "manageEntity": {
    "action": "Save",
    "entityId": "598657",
    "entityType": "Track",
    "nonce": "0xbf2ae00c9eb1ac4a914d4b350250fdb34b512c46b826bd6506ebb9621b142b69",
    "signature": "0x87caa39206997d625356ed87a94d94efda17911753780d7aa0dcf987f9f87e7b2d0cbd7702ec7188e2a7cbad15bec5e49a924d5fa9c81eeec1cbbd520f07737e1c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}