there are miners that switch between currencies for max profit: https://www.multipool.us - so low-profit ones have less double-spend prot
if this becomes more popular in the future, it could IMO endanger cryptocurrency stability
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so if an attacker now starts mining a currency for a double-spend attack, other miners *will leave* because the attack reduces profit
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so you actually need less than 50% of pre-attack network computing power for a double-spend
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