How does Kaspa prevent block relay spam on its network?

Kaspa's block relay system automatically skips blocks that fall below a minimum work threshold, stopping low-quality blocks from clogging the network. When nodes pass blocks to each other, the relay flow checks whether a block's "blue work" — a measure tied to how much valid effort backs it — clears a cutoff called the virtual merge depth threshold. Blocks that don't make the cut are simply dropped rather than forwarded. This keeps the relay process lean by ensuring only sufficiently worked blocks travel across the network. For a beginner, it means Kaspa has a built-in quality filter on block traffic, so spam doesn't waste the bandwidth that legitimate blocks need.