A guide to building a blockchain

Even putting aside the hype around cryptocurrencies, it’s impossible to deny how big an innovation they are. Computers and the internet brought us free and unlimited copies of data: You can create a file and send it to thousands of people for free. The invention of blockchains brings scarcity to the internet: If you have a coin, only you have it.Through this guide, we’ll go over what a cryptocurrency is by building one from scratch in Ruby. If you don’t know Ruby, don’t worry, it’s a surprisingly simple language, and as long as you have a bit of coding knowledge, you’ll follow along just fine.