Multiplicity: A Gadget for Multiple Concurrent Block Proposers

Co-authored with Max Resnick Also shared on other relevant forums MEV and the Proposer’s Monopoly on Inclusion Modern blockchains operate on a leader-based system where a rotating proposer holds the power to decide which transactions are included in each block and what order to include them in. Some proposers collude with MEV-searchers to maximize the rents that they can extract from this temporary monopoly (e.g. MEV boost). This collusion can warp the equilibria of on-chain mechanisms by allowing some users to pay to censor other users’ transactions. Auctions – a key tool in on-chain mechanism design – are particularly susceptible to manipulation through censorship See Censorship Resistance in On-Chain Auctions by Pai, Resnick and Fox for more details. The proposer’s monopoly on inclusion is the weak link, which allows for cheap censorship. In order to improve the censorship resistance of a chain we need to destroy this monopoly by allowing multiple concurrent block proposers (MCBP). In particular, we would like to expand the set of nodes who are able to contribute transactions in each block. Multiplicity is a practical gadget that allows non-leader nodes to include…

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This is really interesting. Can’t wait to see more of what you guys are building.