Sei just published a major upgrade to its trading-focused blockchain

@SeiNetwork has published the second version of its Giga Whitepaper, the first revision since the original dropped in May 2025. The update tightens one of the network's core performance targets and adds a new transaction privacy layer aimed at institutional traders.

What Changed in V2

The headline change is a tighter finality target. The revised whitepaper pushes the goal down to sub-250ms, an improvement on the sub-400ms figure that has been the benchmark since the original Giga paper. The throughput target of 200,000+ transactions per second is unchanged from V1. Sei Labs first published the Giga whitepaper on May 19, 2025, positioning the project as the first multi-proposer EVM layer-1 blockchain. V2 refines that foundation rather than replacing it.

The upgrade is also designed to land without a regenesis or taking the network offline, reducing disruption for applications already running on the chain.

Sedna: A Private Transaction Layer Across Multiple Lanes

The most significant new addition in V2 is Sedna, a private transaction layer built to reduce MEV and front-running risk. Rather than broadcasting full transaction data to all proposers at once, Sedna breaks each transaction into fragments and distributes them across separate proposer lanes. No single proposer can see the full details of a trade before it is finalized. Execution then follows a deterministic order once enough fragments are available. The practical effect is that would-be front-runners cannot read a pending transaction in time to act on it.

Paired with deterministic ordering across those lanes, Sei says the design nearly eliminates MEV and censorship risk, two concerns that have historically kept institutional trading activity away from most layer-1 blockchains. The upgrade targets all three factors institutions care about: latency, throughput, and predictable ordering.

Sei Labs co-founder Jayendra Jog previewed the efficiency case for the approach in a mid-June interview, noting that Sedna would deliver roughly 90 percent of the privacy benefits of a full zero-knowledge layer while requiring just 0.01 percent or less of the implementation effort. The full technical specification is set out in the Sedna protocol research paper on arXiv. The public milestone tracker for the full Giga rollout is available at giga.seilabs.io.

Sources:
Sei Labs: Sei Giga Whitepaper announcement (May 2025)
arXiv: Sedna protocol research paper
Sei Labs: Giga public milestone tracker