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Nice! > In some cases this can be quite significant, and reduce the attack cost by up to 80%. I get how block rewards bring the net cost down, but where does

by paulgb 8y ago

Nice! > In some cases this can be quite significant, and reduce the attack cost by up to 80%. I get how block rewards bring the net cost down, but where does the 80% number come from?

xur17 8y ago
> I get how block rewards bring the net cost down, but where does the 80% number come from? It's a rough number - In the case of Bitcoin, the miner receives 12.5 BTC (+ transaction fees that I will ignore for now) per block, with a block time of 10 minutes, so they will receive 75BTC per hour, or $544,275. In this case it wouldn't be possible to actually rent anywhere near this much hash power at this price, but for smaller coins it would be possible to do so.