public async Task <IActionResult> Upload(IFormFile formFile)
{
var fileName = WebUtility.HtmlEncode(Path.GetFileName(formFile.FileName));
var memoryStream = new MemoryStream();
formFile.CopyTo(memoryStream);
memoryStream.Seek(0, SeekOrigin.Begin);
var binaryReader = new BinaryReader(memoryStream);
var bytes = binaryReader.ReadBytes((int)memoryStream.Length);
var newBlock = _chainService.CreateNextBlock(bytes, fileName);
_networkManager.BroadcastNewBlock(newBlock);
return(RedirectToAction("Index"));
}