On: Cost of a 51% Attack for Different Cryptocurrencie...

[fastball]

I don't disagree, but the idea that you can't use the same methodology to determine a 51% attack price for Bitcoin is just wrong.

Indeed, back-of-the-napkin calculation with an order randomly picked from NiceHash[1] for Bitcoin mining and the same methodology gives:

Cost (PH/HR): 0.0002625 BTC

Bitcoin Network Hashrate (PH/HR): 9M

51% attack for one hour: 4.6M PH => 4.6M * 0.0002625 ~= 1200 BTC

So a one-hour long 51% on the bitcoin network would cost $43,200,000 at $36K per BTC, as per a NiceHash rate I randomly selected.

[1] https://www.nicehash.com/my/marketplace/SHA256

[ClumsyPilot → fastball]

But that number is super misleading - you cant actually get that much compute from nicehash, you would struggle to get that much compute even from aws.

You real costs are going to be much higher, it would probably take you more than an hour to spin it all up and execute the attack. I feel realistic number is 10x to 100x higher

[fastball → ClumsyPilot]

Right, you can't get to 51% of the Ethereum network with NiceHash either, but it's still on this website, so...?