CLEblockchain

5/3/2018

This is a basic block. You can see it has been tested in the terminal used "dev-test": "nodemon dev-test". In the package.json

genesis block created succesfully tested

first generation tested

5/10/18

algorithm SHA-256 secure S, hash H, algorithm A, 256 bits for the hash or 32 bytes or characters generated to represent the hash

makes a unique has value (32-byte for each block )
Its a one way hash from the direction of the data to the hash makes it easy to check blocks see if data has been tampered with 

installed dependencies interminal

     npm i crypto-js  --save

     check to make sure installed  cat package.json 

     const SHA256 = require ('crypto-js/sha256');     is a function that generates a unique hash based of data 

 note     const hash = 'todo-hash';
  changed to  const hash = Block.hash(timestamp, lastHash, data); ####

5/12/18

This is installed to automate testing of the blocks

important change this to to test correctly in package.json

5/13/18

    Created block chain test file to make sure genesis block was reproducing next block correctly

Three things needed to do:

    1. validate a valid chain
    2. invalidate a chain with corrupt genesis block
    3. invalidate any corrupt block in the chain 

5/14/18

Added more to the blockchain.test.js

    1. Chain is replaced if a given chain is valid.
    2. Chain is not replaced if <= to the length of the current chain 
    3. Chain is replaced if passes validation test

Placed all blockchain files in blockchain folder.

I changed all blockchain file references to index so as not to get confused

I added app folder to get blocks

5/16/18 Creating API HTTP request to view blocks I already have

Added code to index.js/app changed package.json

used postman for get request

Able to now mine blocks. Note the last hash matches genesis block and it now has own time stamp.

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created peer to peer server using Web Socket Server. Able to broadcast changes in the blockchain

5/21/18 gettting messages from peers continued updated p2p-server