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51% Attacks Pose the Biggest Threat to Smaller Mining-based Cryptocurrencies, writes Julia Magas. Bitcoin recently experienced what was touted as a double-spend attack, which is where an attacker sends a transaction that it later fraudulently revokes. The day of reckoning may soon come where cryptocurrencies with older designs are unable to keep up in the ever-evolving and competitive technological landscape. Bitcoin Cash and Bitcoin Cash also experiences double-sending attempts, sometimes thousands a day.