Alejandro Ranchal-Pedrosa
Protocol researcher at Sei Labs designing BFT consensus, authenticated data structures, and mechanism design for blockchains. PhD in Blockchain Technologies from the University of Sydney, with work on consensus tolerating adversarial majorities. Current focus: low-latency finality in the 5f+1 model, rateless-coded data dissemination, and stateless execution via authenticated digests.
Sessions
We present new BFT consensus designs in the 5f+1 model that achieve sub-second finality without leader bottlenecks. By exploiting richer quorum structures, we enable leaderless one-round finalization, optimistic responsiveness under asynchrony, and clean composition with existing common prefix of the available layer, unlocking qualitatively new trade-offs for Ethereum's finality pipeline.
Current blockchains bottleneck throughput at a single proposer. Sedna introduces rateless-coded multi-proposer dissemination: all validators propose and DA is guaranteed without redundant retransmission. We analyze incentive compatibility under adversarial withholding via a progressive threat model and present PIVOT-K, a bounty mechanism ensuring honest participipation is a dominant strategy.