{
  "manageEntity": {
    "action": "Save",
    "entityId": "598062763",
    "entityType": "Track",
    "nonce": "0xdceaa016422c76ca77b5f466b40082bff26c298e929eec9a088e4baa65d14aac",
    "signature": "0xa8c13dd7690a2ccec774189f66b1e83ba2c29a4c63aacc0b97d8c077c8da2cb264e5184f58fb50f08fc5185c14d46ea4407bf23c8dbf09d424b212f3edf4c7941c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}