{
  "manageEntity": {
    "action": "Save",
    "entityId": "1612859951",
    "entityType": "Track",
    "nonce": "0x589e7ce44b795d3e9eae20a201e2f0aec96de9feff9d20e2f9ce21661b30ae6d",
    "signature": "0xc955d9d6c0210c4b16f02ff9734e84d524604cf855c218be63d021599a20ce5a5b84035d9da5ce29267b996fb6aeb3458771750bb7cc5795b38bace9200fdaf11b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}