Quote from: ranochigo on July 12, 2023, 02:26:05 PM

Note that anything below 6 confirmations doesn't require 51% of the network, in theory. You are always trying to outpace the honest miners by mining blocks and building a longer chain than them. Luck becomes a less significant factor at 6 conf. Hence, the probability of you outpacing the honest miners increases with a higher hashrate and at 51% of the hashrate, you will always win.

Having bigger hashrate will increase chance to do it successfully. With same hashrate, with a more confirmations, chance to succeed with such attacks is smaller.

How many Bitcoin confirmations is enough?

Bitcoin confirmation risk calculators.
https://github.com/jlopp/bitcoin-confirmation-risk-calculator
https://web.archive.org/web/20181231045818/https://people.xiph.org/~greg/attack_success.html