var signedXml = new SignedXml(document)
                {
                    SigningKey = certificate.PrivateKey,
                    KeyInfo = new KeyInfo(),
                };
                signedXml.SignedInfo.CanonicalizationMethod = SignedXml.XmlDsigExcC14NTransformUrl;
                signedXml.SignedInfo.SignatureMethod = gost;
                signedXml.KeyInfo.AddClause(new KeyInfoX509Data(certificate));

                var reference = new Reference
                {
                    Uri = $"SIGNED_BY_CONSUMER",
                    DigestMethod = gost
                };
                reference.AddTransform(new XmlDsigExcC14NTransform());
                reference.AddTransform(new XmlDsigSmevTransform());
                reference.AddTransform(new XmlDsigEnvelopedSignatureTransform());

                signedXml.AddReference(reference);
                signedXml.ComputeSignature();
                return signedXml.GetXml();

<?xml version="1.0" encoding="UTF-8"?>
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
   <s:Body xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
      <GetResponseRequest xmlns="urn://x-artefacts-smev-gov-ru/services/message-exchange/types/1.1">
         <MessageTypeSelector xmlns="urn://x-artefacts-smev-gov-ru/services/message-exchange/types/basic/1.1" Id="SIGNED_BY_CONSUMER">
            <Timestamp>2019-04-04T11:02:00.6991649+05:00</Timestamp>
         </MessageTypeSelector>
      </GetResponseRequest>
   </s:Body>
</s:Envelope>