That analysis is actually in the original 2008 bitcoin whitepaper: https://bitcoin.org/bitcoin.pdf https://bitcoin.org/bitcoin.pdf If you have 51% of the powe

That analysis is actually in the original 2008 bitcoin whitepaper: https://bitcoin.org/bitcoin.pdf https://bitcoin.org/bitcoin.pdf If you have 51% of the power, you can roll back everything if you spend enough time on it. If you have 30%, you have a 4% chance of being able to catch up from 10 blocks behind, even if you spend infinite time on that specific fork.