http://cryptowcsnkbmlumidvwptea3rj6wst26k4wp7ac4kpc4cjvcekizlad.onion/index.php?title=Bitcoin&printable=yes
They can be exchanged for other currencies, products, and services. Research produced by University of Cambridge estimates that in 2017, there were 2.9 to 5.8 million unique users using a cryptocurrency wallet, most of them using bitcoin. Bitcoin has been criticized for its use in illegal transactions, its high electricity consumption, price volatility, and thefts from exchanges.