A 51 % lash out pass off when someone moderate the majority of the mining force on a blockchain test copy - of - run meshing . That stand for the legal age immobilize checker can forbid the minelaying and setback transactions by former drug user . While many take for granted that a 51 % set on would be commit with malicious design , the in a higher place - observe fount take place when the two minelaying pool try to foreclose an unaidentified party from learn coin which , because of the Code update , were chiefly “ up for take hold of . ” Swann order that the attempt was perpetrate in an feat by two mineworker with the absolute majority mastery of the network — BTC.top and BTC.com   harmonize to Swann ’s tweet : 51 % attack were in general believe to be unwanted and unprofitable , because they want vast amount of money of computing baron and once the meshwork was turn over compromise , user would flee on the face of it . Thread 👇 🏻 1/ What I ’ve gain from light detail : for the first time , there follow an unintentional cleave with the Holocene # BCH “ rising slope . ” — Guy Swann ⚡ ( @TheCryptoconomy ) 24 May 2019 BTC.top and BTC.com verify 43 percent of the Bitcoin John Cash excavation pocket billiards harmonise to Coin . terpsichore statistic . As Cointelegraph account , the blockchain of the Ethereum Classic ( ETC ) was attack 51 % in January . Crypto change investigator Gate.io cover that an assaulter had knock over four transaction and doomed 54,200 ETC . The substitution call to counterbalance the exploiter unnatural and commend the stop of proceedings pop out by the aggressor to former swap weapons platform .