Laibit Mine Pool Jiang Zall issued a statement saying that BCH was correct in the expansion dispute. In the bull market in 2017, BTC had a super-congestion, and the transaction fee reached a horrific thousand or even thousands of dollars. It runs counter to the design of Sakamoto's cash. In the following 2018~19, Core's SW (Isolation Witness) and LN (Lightning Network), which can solve the congestion problem, were also proved to be invalid. The isolation verification only has a 1.23 MB expansion effect. The lightning network is also almost useless. In the currency price increase in May 2019, the same congestion as in the previous 2017 period has occurred, and the transaction fee percentage has risen sharply. It can be expected that in the next 2020~21 halving of the bull market, BTC will once again experience super congestion, and it is estimated that a transaction fee will reach several thousand yuan or even tens of thousands of yuan.