public ActionResult SignHash(ShellmaModel model)
 {
     Model = model;
     return RedirectToAction("VerifySignature");
 }
 public ActionResult VerifySignature(ShellmaModel model)
 {
     Model = model;
     return View(model);
 }
 public ActionResult Hash(ShellmaModel model)
 {
     Model = model;
     return RedirectToAction("SignHash");
 }