Blockchain is the new buzzword, and can be a major step in a higher security in the digital World.
Ethereum seem to be a easy to start place for developping and testing blockchain
And a illustrativ demo https://anders.com/blockchain/ with source code at github
An introduction in Danish you can find at http://www.danskbitcoinforening.dk/
Here is two guides to make and test an private blockchain
https://hackernoon.com/learn-blockchains-by-building-one-117428612f46
https://hackernoon.com/the-product-managers-guide-to-the-blockchain-part-1-fb95dfb7af31
