Bitcoin has Difficulty, a measure of how many zeroes you must have in your hash. https://en.bitcoin.it/wiki/Difficulty https://en.bitcoin.it/wiki/Difficulty h

Bitcoin has Difficulty, a measure of how many zeroes you must have in your hash. https://en.bitcoin.it/wiki/Difficulty https://en.bitcoin.it/wiki/Difficulty https://en.bitcoin.it/wiki/Target https://en.bitcoin.it/wiki/Target Basically, every 2016 blocks (around 11-14 days) new difficulty is calculated based on the time it took to find the previous 2016 blocks. Whenever someone gets new fast hardware, blocks get solved quicker, but then the difficulty gets adjusted after 2016 blocks, and it becomes hard again (but even harder for the people with worse hardware).