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a simple blockchain sample in C# for .Net

A simple blockchain example in c# using SHA512 for hashing.

This lib can:

Generate a block with data.
Add that block to a chain (in this case a List)
Create a hash for that block
Create a hash based non a Nonce, a proof of work, or: mining a block.
Validate that hash and the hash of a previous block
Validate the whole chain

Enjoy

usage, as like in a Console application:

  using nl.hyperdata.blockchain;
  using System;
  using System.Linq;

  namespace BlockChainSample
  {
        class Program
        {
            private static Random random = new Random(DateTime.Now.Millisecond);
            private static readonly IBlock genesis = new Block(new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 });

            /** proof of work (https://en.wikipedia.org/wiki/Proof-of-work_system)  is set here: a hash needs 2 trailing zero bytes, increase the number of bytes to reduce the number of valid  hashes, and increse the proof of work time **/
            private static readonly byte[] difficulty = new byte[] { 0x00, 0x00 };

            static void Main(string[] args)
            {

                /** Initiate the chain, set a difficulty for genarating the hash (proof of work) 
                and define the genesis data (not really important) **/
                BlockChain chain = new BlockChain(difficulty, genesis);

                // ** start mining 20 blocks in a loop **/
                for (int i = 0; i < 20; i++)
                {
                    /** randomly generated dummy data **/
                    var data = Enumerable.Range(0, 256).Select(x => (byte)random.Next());

                    /** add the fresh, unhashed block with the data to the chain **/
                    chain.Add(new Block(data.ToArray()));

                    /**-> blockchain magic happens here <-**/

                    /** output the generated block details **/
                    Console.WriteLine(chain.LastOrDefault().ToString());

                    /** validate the chain (ie: is each block's hash valid and is the prevoius block has valid)
                    Console.WriteLine(String.Format("Chain is valid {0}:", chain.IsValid()));
                }

             }
        }
  }

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