{
  "manageEntity": {
    "action": "Save",
    "entityId": "338037808",
    "entityType": "Track",
    "nonce": "0xe9db072b8ba99019c6673d296ec6dd852fc7319b1aac74e9002367dcb0e4b3fa",
    "signature": "0x0f9b99e070253b8cd7df0935ce007080744dff6bf5bebb6f65f9ad77917a15bb5838140892c6afceb87937f617555e4bb6b52f918cee24208e93ddc0cf5b498d1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}