For this question, assume the overall hashrate of the environment is constant.
- If 25% of the network hashpower were to be isolated (Australia had no Internet for example), what is the effect on block generation?
I suspect that blocks in Australia will take 75% longer to confirm, and the the main chain will confirm
75% faster (Edit: it will take 25% longer for the main chain to confirm, difficulty will adjust downward).
If I extrapolate the effects suppose
- This outage is long-lasting
- A multiple of the 2016th block is reached on the main chain. Maybe several multiples.
- Difficulty is adjusted.
Given that the Bitcoin client is hard coded to prevent a change in difficulty more than 4x the the current difficulty:
What would happen to the isolated Australian chain if it reconnects to the main chain? (w.r.t. the difficulty adjustment)
Suppose a different percent of the network were to become isolated. What combination of %isolated, duration, and network hashrate would cause a 4x difficulty to be reached?