Bitcoin Plunge Has Newbies Scrambling to Google Double-Spend. Bitcoin plunged more than 10% Thursday, sparking a hunt for reasons the notoriously volatile asset was selling off. One that captured attention questioned the very viability of the token itself — though it turned out not to be cause for concern. A report in a trade blog suggested that there had been whatâs known as a double-spend, where the same token is used by the same person in two transactions. Itâs like if someone bought a car, paid the seller, drove off with their brand new wheels and then later yanked back all the money. In the case of the blockchain — or the software that underlies Bitcoin and other cryptocurrencies — the transaction in question would be excluded from the final tally on the digital ledger. But, â
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