Thanks to a string of screw-ups and bugs, an unsuspecting developer recently took possession of an estimated $US390 million worth of the Ethereum cryptocurrency by accident. In an attempt to give back the money, however, the guy ended up locking up the funds permanently. Essentially, the money has just evaporated.

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https://www.armstrongeconomics.com/world-news/cryptocurrency/ethereum-cryptocurrency-almost-400-million-vanishes/