with, say, 10 of the processing power in the network 100 minutes to find a valid block (200 minutes at 5 etc but those are just averages. We still need to produce a valid proof of work.
Bitcoinin perusteet - Haaste
Bitcoin-louhinnan vaikeus tekijä, Bitcoin korko usd, Bitcoin-hash korko elää,
Six Confirmations The only exception to the above rule is if the attacker simply gets lucky. In this case there are many possible inputs that could add up to 10 (55, 136, 7111, etc). But suppose he does this, can he just relay his fraudulent block to the network and hope that miners will replace the old block with his new one or, more realistically, that new users will download his fraudulent block? A change to the hash of block 101 will cause the header of block 102 to change and so on all the way through the block chain. CPU mining quickly gave way to GPU ledger wallet app bitcoin-rahaa mining (graphics processing units) which proved much more efficient at calculating hash functions.