Bitcoin was the first cryptocurrency and is still the biggest and best-known – its rise in value from a few cents to hundreds of dollars per coin by mid-2016 had given rise to a frenzy of excitement among investors. Cryptocurrency as an idea was just entering the mainstream. Lots of people were looking to get involved in this strange new opportunity. For a long time, people have tried to create a form of digital money independent of state-backed currencies. But they have always failed because no-one could trust them. The reason so many people are excited by Bitcoin is that it solves that problem. It depends upon a special type of database called a blockchain, which is like a huge book – one that Bitcoin owners have independent but identical copies of . What are the common crypto forgery techniques ?

