Hydrozoan: New Blockchain Trick Makes Payments 25% Faster

Every blockchain — and most modern payment systems — runs on a simple-sounding trick: getting dozens or hundreds of computers to agree on one shared record of what happened. That agreement step is what makes crypto slow. Today's fastest systems offer a choice between quick-but-fragile and slow-but-tough. If a few machines break or lie, the quick ones stall, and everyone waits.

Hydrozoan, a new protocol from researchers Qianyu Yu, Lefteris Kokoris-Kogias and Alberto Sonnino, sidesteps that trade-off. It gives computers two ways to finish a transaction: a fast lane that takes two rounds of messages, and a backup lane that takes three. Whichever finishes first wins. The paper's key insight is geographic. In tests spread across the globe, a message round that has to reach a distant continent costs far more than one that stays in a fast region — so which lane is quicker is really a fact about where your data centers sit, not about the software.

In geo-distributed tests, Hydrozoan matched the throughput of Mysticeti, a leading rival, and committed roughly 25% faster when most computers were in nearby regions. When they weren't, it quietly fell back to three rounds. Existing two-round systems simply stall in that situation, which is why they're rarely used in production.

The work is still academic — a preprint, not a shipped product — but its safety claims were machine-checked in Lean 4, a tool that proves mathematical arguments by computer. The practical catch is tuning: operators must correctly configure how many machines they expect to fail. Get it wrong and the system stays safe but slower. For now, the biggest winners would be crypto exchanges and cloud providers, not everyday users directly.