Bitcoin is the currency of the Internet: a distributed, worldwide, decentralized digital money. Unlike traditional currencies such as dollars, bitcoins are issued and managed without any central authority whatsoever: there is no government, company, or bank in charge of Bitcoin. As such, it is more resistant to wild inflation and corrupt banks.
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Linux users unaffected... which isn't due to better design because keyloggers are trivial with how nonexistent sandboxing is on X11. Wayland can't come soon enough, but it keeps on feeling like 2019 will be the "year of the Wayland desktop".