Bitcoin could 'bring internet to a halt': BIS
https://phys.org/news/2018-06-bitcoin-internet-halt-bis.html
Unlike central bank-issued denominations, virtual currencies are produced, or "mined," by banks of computers solving complex algorithms, and then freely traded online.
The other key difference with typical currencies is that the number of bitcoin in existence can never exceed 21 million. There are currently some 17 million bitcoins in circulation.
