Theoretically, there is no upper limit and it is stored in the background database, but it will be downloaded to the BWC before use. The memory of the BWC is 32G, calculated with the size of a blacklist of 3M, it can store up to 10,000 copies. Detection speed: 1:1000 can be completed in 0.1s 1:10000 can be completed in 0.5s.