How long does it takes to confirm a block?

[ziranliu]

According to #4965 (comment) , EOS doesn't use BFT consensus. So in my understanding, it should be at least 2/3 +1 (15) BPs confirming, around 90 seconds, in pure DPoS consensus of EOS. Is that right?

[taokayan]

It's combination of DPOS and BFT. In normal situation it takes around 330 block time (165 seconds) to make a block become irreversible. (please check https://eosnetworkmonitor.io/)

[ziranliu]

@taokayan Thx for your explanation! But I'm still puzzled. I see from https://eosnetworkmonitor.io/ that the difference of current block height and irreversible block height is around 330. But in theory, 2/3+1 (15)BPs confirming could make a block irreversible, hence the max difference of current block height and irreversible block height should be 180. Why it's around 330 in reality?

[taokayan]

the actually implementation use DPOS + BFT which result in around 320-330 block time delay. Pure DPOS will only result in around 180 block time.

[ziranliu]

@taokayan If the BFT you use increases the confirmation time, what's the benefit of it? And is the BFT you use same with EOS white-paper mentioned?
And by the way, I see many cryptocurrency exchanges like Huobi and Binance credit EOS deposits to a client’s account after only one confirmation. Do you know why they can do like this?

Sorry for so many questions bothering you!

[taokayan]

The basic idea can be found from https://medium.com/eosio/dpos-bft-pipelined-byzantine-fault-tolerance-8a0634a270ba