Sei Becomes First Blockchain to Enable Multiple-Concurrent Proposers With Giga

• Sei Giga introduces multiple concurrent proposers and new MEV patterns backed by formal research from Sei Labs.

• Devnet tests hit 5 gigagas, yet SEI trades in a downtrend below its 50-day EMA on Binance.

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Sei said its upcoming “Giga” upgrade will make the network the first blockchain to run with multiple-concurrent proposers instead of a single block builder. In a post on X, the team called Sei Giga a performance breakthrough that lets several proposers create blocks at the same time, changing how transactions enter the chain and how MEV appears.

The new design breaks the standard sequential model where one producer decides transaction order in each slot. Now, several proposers can publish blocks for the same tick before the system fixes the final execution order. This setup pushes competition over profitable trades toward races between proposers that try to include the best transaction flow first.

Ahead of the upgrade, Sei Labs released a research paper titled “MEV in Multiple Concurrent Proposer Blockchains” by Steven Landers and Benjamin Marsh. The study analyzes how MEV behaves when blocks form in parallel and identifies channels such as same-tick duplicate steals, proposer-to-proposer auctions and latency-driven timing races.

The authors build a hazard-normalized model of delay and inclusion, derive a delay envelope for transaction arrival and examine equilibria in censorship, duplication and auction games. They also propose deterministic priority DAG scheduling and duplicate-aware payouts that aim to neutralize same-tick MEV while keeping throughput high.

Sei Labs said this work lays the groundwork for protocol rules around Giga and targets MCP-specific MEV without relying on centralized builders. With the upgrade, the team expects applications that depend on low latency and high volume to operate on Sei while the protocol enforces limits on extraction in the new proposer model.

Sei Says Giga Upgrade Hit 5 Gigagas on Global Devnet

Sei said on April 22, in a recent update, we covered, that its Giga upgrade with Autobahn consensus had already shown 5 gigagas of processing power on an internal devnet. The test ran on a globally distributed network, demonstrating how the design handled heavy throughput under real-world latency conditions.

According to the team, the combination of data availability and BFT consensus reshaped what they viewed as possible on-chain. As a result, they argued that performance at this scale could unlock a new class of applications that depend on fast, high-volume transaction processing.

On Dec. 2, SEI traded near $0.122 on Binance, sitting well below its 50-day EMA around $0.174.The daily chart shows a persistent downtrend from October, with price pushing toward new lows as sellers keep pressure on the market.