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by qznc 3237 days ago
> Also if you do share history, it is much much harder to start, because you start off with the previous difficulty which is very hard to mine on.

You need to fork the code (with your changed rules) anyways and you can adapt the difficulty then. Bitcoin Cash did exactly that. They lowered the difficulty to something like 10% of Bitcoin anticipating 10% of the hashing power. They only got 1% and there was a gap of 9 hours without any new block. They seem to be at ~1h per block now. [0]

[0] http://blockdozer.com/insight/blocks