Bitcoin

In two thousand seven, satochi nakamoto started working on bit coin. He was still following david chom's dream of a perfectly anonymous, yet trustless digital currency. Every transaction is registered indelibly forever on an immutable chain. theoretically, if you have enough computers operating to make up more than 51 % of the computers with the block chain on it, you could change the block chain. And there are some groups with potentially the power to do this.