In just the past two weeks, three cryptocurrency networks have been hijacked by miners trying to enrich themselves. A wave of selfishness: Motherboard reports that Verge, Monacoin, and Bitcoin Gold have all recently fallen victim to the dreaded “51 percent attack,” a nightmare scenario in which a miner or mining group obtains a majority of the network’s power to approve new transactions.

An estimated $20 million was lost as a result. The mission of MIT Technology Review is to equip its audiences with the intelligence to understand a world shaped by technology.

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