The company Chainalysis analyzed how many bitcoins were irretrievably lost for all time. Their amount is 2.5 million BTC. The key reason for the loss is considered to be a frivolous attitude to the keys and media where the first cryptocurrency was stored. Many also did not understand the prospects of bitcoin at the dawn of its formation, at a time when its production was possible with the help of a home computer and it did not cost so much money. It should be borne in mind that 2.5 million BTC does not include 1 million BTC of Satoshi Nakamoto, who has not moved from his wallet for more than 10 years. And other wallets that keep Bitcoin without movement for years, but are not considered lost. In addition to the cryptocurrency that was lost, we can also talk about people who could make a fortune on it in a short time, but also quickly got away with nothing.