test.cs

[HttpPost]
[Route("Document/ValidateDocument")]
public bool ValidateDocument(string document, string blockHash)
{
    if (document == null || blockHash == null)
        return false;

    // calculate the MD5 of the uploaded document
    string sChecksum = Checksum.CalculateMD5(Convert.FromBase64String(document));

    // load the associated blockchain
    Blockchain bcDocument = new Blockchain(sBlockchainPath);

    Block blockDocument = bcDocument.GetBlock(blockHash);

    if (blockDocument == null)
        return false;

    if (bcDocument.IsValid(blockDocument.BlockHash)) {
        // get the SignedDocument object from the block
        SignedDocument signedDocument =
            JsonConvert.DeserializeObject<SignedDocument>(blockDocument.Data);

        // compare the checksum in the stored block
        // with the checksum of the uploaded document
        return (signedDocument.Hash == sChecksum ? true : false);
    }
    else return false;
}