Those stronger terms are justified, especially after the latest spell of wild price volatility. But the idea underlying bitcoin -- blockchain, or distributed-ledger technology -- could be transformative.
The problem with bitcoin and other so-called digital currencies is that they’re a misuse of this technology. As either a new form of money or an investment, bitcoin has fatal disadvantages.
Tokens that are privately created -- "mined,” if you insist -- can succeed in a limited way as a means of exchange and be used to execute certain kinds of transactions. (Cigarettes in prison are a kind of currency.) But as a reliable store of value, bitcoin is much less useful, because its volatility is so extreme. The value of ordinary currencies is underwritten by governments and stabilized by central banks acting as trusted monopoly producers. Bitcoin and its rivals leave those vital roles vacant.
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