How do you build a high-speed blockchain without letting validators steal each other's rewards?
MonadBFT from @monad solves the tail-forking problem that plagues pipelined consensus. 🧵
Pipelined BFT consensus improves throughput by processing multiple blocks simultaneously. But there's a catch: tail-forking lets malicious leaders steal rewards by abandoning blocks that already gathered enough votes.
Traditional protocols like Basic HotStuff finalize one block at a time. Pipelined protocols process several blocks concurrently. Faster, but creates vulnerability in the "tail" of unfinalized blocks.
Here's tail-forking in action: Alice proposes block b', validators vote for it, but Bob ignores those votes and reproposes the same transactions in b'', stealing Alice's rewards and MEV opportunities.
MonadBFT's solution: a reproposal mechanism. When validators timeout, they include their latest vote. Leaders must either extend the previous block or repropose the highest-voted block. No abandonment allowed.
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