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A communication protocol for speeding up in the rate at which blocks (and more importantly, the transactions inside them) can be considered final/irreversible (not subject to reversion in fork). This is the "secret" feature I've mentioned in the past :-)

Aaaah I see :D Looking forward to it !

smart contracts?

Unrelated

ok. No idea what block finality protocol is :D

Recent blocks in a chain can be reversed. So you can see them as an indication of what transactions will occur but can't rely on them (for example to perform a trade). Currently in Hive it takes about a minute for blocks to become final where the transactions can be relied up. @blocktrades is apparently working on a way to speed that up.

Very interesting.

Was there any problem in the past with that?

Not a problem. Would be an improvement.

hehe,

fix never a problem nobody has :D

But improvements are always nice. Have you an example for me of what could be done better?

I could imagine some more complex trades ( sandwich swaps) or something else that relies on each other.

But not sure I riding the right horse :d