October 1, 2018 - Vertcoin 51% attack $100’000

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The 51% attack on the Vertcoin network occurred between October and December 2018. In the attack, transactions in some orphaned blocks were double spent in the eventually accepted transaction history. A total of 71,000 VTC ($50,000) were double spent. In the ensuing panic, the price per VTC decreased from $0.7 to $0.3 per coin. Source