Cadence consensus hits 219ms finality with extreme pipelining, multiple proposers

Cadence is a new Byzantine fault-tolerant multi-proposer consensus protocol designed to push blockchain throughput to its limits. It divides time into equally spaced slots, each with its own independent consensus instance. Because blocks do not build directly on their predecessor, the protocol achieves "extreme pipelining"—no slot waits for an earlier block to finish or propagate. This decouples the block interval from network latency, enabling arbitrarily low block times. Additionally, Cadence replaces the single-leader monopoly with multiple concurrent proposers (MCP): several validators propose each block, guaranteeing that under synchrony, a transaction included by a correct proposer cannot be censored or deferred, and proposers cannot react to others' proposals (hiding).

To realize extreme pipelining, the authors introduce a general framework that turns any one-shot consensus meeting a slot-consensus specification into a multi-shot protocol. They instantiate it with two protocols of their own: Chorus, a slot consensus that finalizes a block in an optimal three rounds (with speculative finality one round earlier), and Conductor, an orchestrator that opens slots at an even cadence, slowing down under asynchrony to keep open slots bounded. In simulations over Monad's 200-validator setup with five proposers per slot, finalization averages 219 ms (167 ms to speculative finality); at a 100 ms block interval, a transaction waits on average only 50 ms to enter a proposal. Cadence is the first MCP protocol to provide short-term censorship resistance and hiding at the fast-path latency of single-leader consensus.