@shengyansun
Bitcoin is a cryptocurrency, a virtual or digital currency that has no physical form.
Bitcoins can be split into smaller units, with a satoshi being the smallest monetary unit.
Satoshis are named after bitcoin's inventor Satoshi Nakamoto – believed to be a pseudonym – who wrote a key document about the currency in 2008.
Those investing in the product around this time, like Mr Howells, were part of a "very small" crypto community known as Cypherpunks, said Billy Bambrough, author of the CryptoCodex newsletter.
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