AMP: Rethinking Block Building with Multi-Proposer Consensus

Circle Internet Financial introduces the Arc Multi-Proposer Protocol (AMP), a blockchain innovation designed to enhance transaction inclusion and ordering by integrating a new role called the proposer, who bundles user transactions and directly broadcasts them to validators. This system moves away from the traditional single block assembler approach, which concentrates power and raises concerns about maximal extractable value (MEV) and transaction manipulation. AMP aims to offer more predictable and fair transaction handling by implementing bounded inclusion and fixed ordering, which ensures that once a payload is validated by a majority, it must be included in the next block in a predefined order. Built on the Tendermint-based consensus engine Malachite, AMP operates independently of the consensus layer, allowing applications to capture the value of their transaction flows. This protocol is still in exploratory development and its adoption on the Arc blockchain by Circle is subject to further evaluation and testing, with no guarantees regarding its future implementation.