Brute force? I don't think so. Orders of magnitude in brute force are sometimes easier to look at as raw numbers. If we take the sibling comments estimate of th

Brute force? I don't think so. Orders of magnitude in brute force are sometimes easier to look at as raw numbers. If we take the sibling comments estimate of the global BitCoin network's total computation of 2^90, multiply it arbitrarily by three orders of magnitude we get: 2^90 = 1237940039285380000000000000 2^90 * 1000 = 1237940039285380000000000000000 2^128 = 340282366920938000000000000000000000000 Even G20 nation states would still be many orders of magnitude short. Much (much, much, much) cheaper to spend your money and energy on an actual Manhattan Project. Then just show up with a nuclear warhead and ask politely for the key.