What Is The Sei Network? The Complete Guide

By Lipsa Das

A core challenge in the blockchain industry is the trade-off between performance and compatibility. Ethereum’s sequential processing model, while foundational for smart contracts, often struggles with the high transaction throughput required for mainstream consumer applications.

While alternative solutions have emerged, they frequently force developers to choose between performance and access to Ethereum’s mature ecosystem. The Sei Network was built to eliminate this compromise. By evolving toward a parallelized EVM-only architecture, Sei offers the performance of a high-speed execution engine while maintaining full compatibility with the tools developers and users already trust.

In this article, Ledger Academy explains how the Sei network is reaching global scale through its ongoing technical milestones, and the security benefits of interacting with this high-performance environment via the Ledger ecosystem.

What Is The Sei Network?

Sei is a high-performance Layer 1 blockchain designed to achieve the speed and efficiency of centralized systems without sacrificing decentralization. Originally built with dual-stack support on Cosmos and the Ethereum Virtual Machine (EVM), the network is undergoing a definitive shift in 2026 with the SIP-3 upgrade, transitioning to a fully EVM-only environment.

This architecture uses a parallel execution engine that allows multiple independent transactions to be processed simultaneously. According to Sei, this design allows the network to support a theoretical maximum of 12,500 transactions per second (TPS) on its current mainnet, with finality in under 400 milliseconds.

Looking forward, the Sei Giga upgrade aims to push these capabilities further. By implementing the new Autobahn consensus protocol, the network targets a throughput of over 200,000 TPS: a 50x increase over previous standards that positions it as a potential layer for high-frequency trading, real-time gaming, and global payments.

Who Is Behind Sei Network?

Jeffrey Feng and Jayendra Jog co-founded Sei Labs in 2021, bringing complementary expertise from traditional finance and technology. Feng’s background at Goldman Sachs and Coatue Management provided an understanding of trading systems and market infrastructure, while Jog’s engineering experience at Robinhood brought expertise in building high-performance consumer applications.

In 2023, the team secured over $30 million in funding from leading crypto investors, including Multicoin Capital, Jump Crypto, Coinbase Ventures, and Delphi Digital.

What Is Sei For?

Sei’s high-performance blockchain is designed to support application categories that require high throughput, such as real-time gaming or social platforms, while maintaining full compatibility with existing Ethereum tooling and infrastructure.

Consumer Applications and Global Payments

While traditional blockchains that process 10-100 transactions per second make it difficult to build responsive consumer applications, Sei’s capacity of over 12,500 TPS is designed to enable more demanding use cases. Not to mention, that figure is set for a massive increase following the full completion of the Sei Giga upgrade.

This infrastructure supports applications such as real-time gaming with instant state updates, social platforms capable of supporting thousands of concurrent users, interactive entertainment with complex user interactions, and high-frequency DeFi protocols that require rapid execution.

A significant driver of adoption in 2026 is Sei’s partnership with Xiaomi, the world’s third-largest smartphone manufacturer. This collaboration involves pre-installing a native Sei wallet on millions of devices sold globally, enabling peer-to-peer payments and access to decentralized applications (dApps).

Developer Experience

Sei is designed to provide the performance of a custom blockchain while maintaining full compatibility with Ethereum’s established developer ecosystem. This allows developers to deploy existing smart contracts written in Solidity or Vyper without requiring any changes. The platform supports familiar development tools, including MetaMask, Remix, and Hardhat, ensuring a seamless transition for those already building on Ethereum.

Furthermore, its architecture is optimized for parallel execution, where transactions run concurrently when possible and sequentially when necessary. This ensures existing decentralized applications are backward compatible and can function on the network without modification.

Institutional Infrastructure

Sei is built to handle the demands of professional users and large companies by offering reliable, high-speed performance. Its design ensures that no single group can easily block or control transactions, creating a stable environment for professional network operators. The platform also includes built-in tools that help users stay compliant with local regulations and easily verify their activities on the blockchain.

Ledger Enterprise Support

Institutional adoption of Sei is facilitated by Ledger Enterprise, Ledger’s platform enabling businesses and financial institutions to safely store, manage, and transfer digital assets. 

This support allows professional participants to engage in the Sei ecosystem while maintaining strict treasury management standards. By leveraging Ledger’s proven hardware-based security, institutions can manage high-volume transactions on Sei with the assurance that their private keys remain offline and their operational workflows are protected against internal and external threats. 

This infrastructure is a critical component for Sei as it aims to bridge the gap between decentralized innovation and traditional financial standards.

What Is the SEI Token?

The SEI token is the native utility asset of the Sei blockchain. It serves several roles within the network’s ecosystem:

• Transaction Fees: Used to pay for computation and storage on the network.
• Network Security: Secured via a Proof of Stake (PoS) mechanism where users stake SEI to support validators.
• Governance: Token holders can vote on proposals related to software upgrades and ecosystem initiatives.
• Native Collateral: Used as liquidity and collateral within dApps.

The network’s economic model is designed to promote decentralization by distributing block rewards equally among all active validators and their delegators. Of the total 10 billion SEI supply, 48% is allocated to the Ecosystem Reserve, 20% to the team, 20% to private sale investors, 9% to the Foundation, and 3% to community programs.

How Does Sei Network Work?

Sei’s performance is derived from foundational architectural changes across its consensus, execution, and storage layers. Each component is specifically optimized to maximize throughput while maintaining security and decentralization.

Parallel Execution Engine

The core of its performance is a parallel execution engine that employs optimistic parallelization. What this means is, unlike traditional blockchains that process transactions one by one, Sei runs multiple transactions simultaneously. By default, the system assumes transactions will not conflict and processes them in parallel.

If a conflict is detected, only the specific conflicting transactions are re-executed sequentially, which maintains state consistency without halting the entire process. To optimize this system, the network uses advanced analysis to predict transaction dependencies and minimize conflicts. 

According to Sei’s documentation, this approach is projected to deliver up to 40x higher throughput than purely sequential processing.

Asynchronous Execution

Sei further enhances throughput with asynchronous execution, which decouples consensus from state computation. 

Once the transaction order is agreed upon, the execution results are mathematically determined, allowing consensus to focus only on ordering. While new blocks are being proposed and finalized, previous blocks are executed in parallel background processes. 

This multitasking system allows the network to check transaction details and signatures at the same time, allowing the network to maintain high block production rates during periods of high transaction activity.

Storage Architecture

To prevent data storage from slowing down the network, Sei replaces traditional Merkle tree storage (a complex, layered data structure) with a cryptographic accumulator system optimized for high throughput.

It uses a “flat” key-value store to eliminate the overhead of tree-based structures, making operations more efficient. This allows state root generation to happen asynchronously in the background, ensuring that storing information doesn’t get in the way of processing transactions.

This is supported by a tiered storage model: Sei keeps the most recent data on high-performance solid-state drives (SSDs) while migrating older, historical data to more cost-effective solutions. This split keeps the network both fast and economically viable.

Autobahn Consensus (Sei Giga)

For its upcoming Sei Giga upgrade, the network will introduce Autobahn, a consensus protocol designed to reduce traditional blockchain bottlenecks. Instead of relying on single block producers, its multi-proposer architecture allows every validator to continuously propose transactions in parallel “lanes.”

Validators then vote on data availability using compact cryptographic proofs rather than downloading full blocks. This separates the agreement on transaction order (consensus) from the actual delivery of data.

The protocol also creates regular snapshots that group the latest proposals from all lanes at once. This allows the network to finalize many blocks in a single consensus round, which drastically reduces the digital chatter between nodes and speeds up the entire network.

SIP-3: The Ongoing “Weight Reduction” Strategy

The SIP-3 upgrade, approved in 2025 and currently rolling out through mid-2026, is described by Sei Labs as a “weight reduction” phase. To achieve extreme speeds, the protocol is in the process of stripping away hundreds of thousands of lines of code by deprecating its legacy Cosmos-native transactions and CosmWasm smart contract support.

While the transition is still ongoing as of March 2026, the eventual goal is for Sei to become an EVM-only chain. This transition means:

• Only EVM (0x) addresses will be able to initiate transactions.
• All Cosmos message handling and IBC (Inter-Blockchain Communication) functionality is currently being removed and deprecated.
• Native oracles are being replaced by industry leaders like Chainlink and Pyth.

The Sei Ecosystem

The Sei ecosystem includes a diverse range of decentralized exchanges (DEXs), lending protocols, and gaming platforms. The Sei Foundation supports this growth through initiatives like a $50 million Japan Ecosystem Fund and its $5 million Global Mobile Innovation Program in partnership with Xiaomi.

Important: SIP-3 Migration Releases

The rollout of SIP-3 involves critical network releases on Sei’s Pacific testnet that require user action throughout the first half of 2026:

• v6.3 (February 2026): Transitioned staking functionality to EVM APIs for custodians and indexers.
• v6.4 (March 2026): Disables inbound IBC transfers, preventing assets like ATOM or USDC.n from being bridged into the network.

Security Warning: USDC Migration

Users holding USDC.n (USDC bridged via Noble) must migrate to native USDC before the transition completes later in 2026. As of March 2026, IBC transfers are being disabled via governance, meaning USDC.n could soon become inaccessible.

Sei Labs recommends that users holding these legacy IBC assets in DeFi protocols wind down their positions immediately and use tools like Skip:Go or the official Sei bridge to migrate to native EVM-compatible assets.

Sei in the Ledger Ecosystem

The integration of Sei across Ledger’s products ensures that users can interact with the network while maintaining complete control over their private keys.

Secure Management via Ledger Wallet

Ledger users can manage their SEI tokens and EVM-based assets directly via the Ledger Wallet app. Currently, users can securely send and receive SEI and other tokens on the Sei EVM. To further enhance the user experience, native swap support is arriving in 2026, allowing users to exchange SEI tokens within the safety of the Ledger ecosystem.

Clear Signing and Security

When interacting with dApps on the Sei Network, Ledger users benefit from Clear Signing. This ensures that the transaction details displayed on the Ledger signer’s secure screen are human-readable and authentic, preventing loss of funds due to blind signing.

The Future of Sei Network

Sei’s roadmap focuses on achieving Web2-level performance while maintaining the core blockchain principles of decentralization and security. With the ongoing implementation of SIP-3 and the deployment of Sei Giga, the network is positioned as a foundational layer for the mainstream global adoption of decentralized finance and high-performance digital ownership.

Experience the scale and speed of the Sei Network free from compromise. Download the Ledger Wallet app today and begin your journey toward secure digital ownership with the peace of mind that only a Ledger signer can provide.