we can discuss the best percentages approach , but if the hash increase lets say 200% from one block to the next you know we're under a flash attack. At that point the diff should increase and not wait for the 60 block retarget. The same way it should retarget down if hash comes down 20% from one block to the next
I hadn't thought of that...intriguing.
I'm sure there are more implementations one can think of. With the BTC mining concentrated in a few hands, mostly business, I foresee the future of ALT coins to be very bleak. A coin has to sustain itself in its own universe. The flash dumps remove BTCs from the small traders in the system, small traders that no longer have access to newly mined BTCs. Because of that is important to protect a coin from flash hash and at the same time create a way to spend them