TLDR; Miners will propagate their blocks before they are mined.
There are several 'thin block' protocols that have existed since before BSV split. These work on the assumption that the block recipient already has most of the raw transactions on hand, and can reconstruct the complete block using transaction ids. There are even ways to only send partial transaction ids.
BSV intends to take this one step further. Miners create a block template and through the process of mining attempt to solve th