Crypto Gloss

Sei Network

Sei Network is a Cosmos SDK-based Layer 1 blockchain that evolved from an order-book-optimized trading chain into the first fully parallelized EVM-compatible Layer 1 — combining Ethereum’s developer tooling (EVM + Solidity contracts) with Cosmos’s app-chain architecture and a parallel execution engine that processes non-conflicting transactions simultaneously, targeting sub-400ms finality for DeFi and trading applications.

Overview

Sei launched on mainnet in 2023 with an original thesis: build an L1 specifically for trading applications where block time, throughput, and order matching speed matter most. The initial Sei V1 featured a native order book (matching engine at the chain level, not as a smart contract) and 380ms block time — faster than most Cosmos chains. However, V2 (launched 2024) fundamentally repositioned Sei as a parallelized EVM L1, abandoning the native-orderbook focus in favor of broader developer adoption via EVM compatibility combined with a unique parallel execution approach that made EVM dramatically faster than Ethereum mainnet.

V1: Order-Book Optimized Chain

Sei V1 (2023) differentiated through trading-infrastructure primitives:

Native Order Matching Engine:

  • Order matching built at the consensus/module level (not as a Solidity DEX)
  • Batch auction clearing at end of each block (vs mid-block race conditions)
  • Smart contract DEXes could hook into the native matching engine

Performance:

  • 380ms block time (finality confirmed, no probabilistic finality)
  • 20,000+ TPS capacity
  • Native price oracles as consensus module (not external oracle needed for basic prices)

V2: Parallelized EVM

Sei V2 (2024) added EVM compatibility with a key innovation:

Parallel EVM Execution

Standard EVM (Ethereum, most L2s) processes transactions sequentially — one at a time:

  • Transaction A must finish before Transaction B starts
  • A slow Transaction A delays everything behind it

Sei V2’s parallel execution:

  • Identifies transactions that do not conflict (different contract state)
  • Executes them simultaneously in parallel threads
  • Conflicting transactions resolve sequentially (dependency graph detection)

Result: Dramatically higher throughput for EVM without modifying Solidity — existing Solidity code runs faster on Sei V2 without changes.

Twin-Turbo Consensus

Sei’s “Twin-Turbo” optimizes consensus:

  • Optimistic block processing — pre-process expected block contents before finalization
  • Intelligent block propagation — send only transaction diffs, not full block, reducing bandwidth
  • Combined: 380ms finality with EVM-level developer experience

Developer Environment

Post-V2, Sei is EVM-compatible:

  • Solidity contracts — deploy directly with standard Ethereum tooling (Hardhat, Foundry)
  • Metamask-compatible — Sei EVM has standard Ethereum RPC API
  • CosmWasm also supported — Cosmos-native Rust smart contracts work alongside EVM contracts
  • EVM ↔ CosmWasm interoperability — EVM contracts can call CosmWasm modules and vice versa
  • Native token: SEI (gas for EVM and Cosmos transactions)

SEI Token

SEI is the native utility, staking, and governance token:

  • Gas — pay transaction fees on Sei (both EVM and CosmWasm transactions)
  • Staking — stake SEI to participate in Tendermint BFT consensus validation (~7-9% staking APR)
  • Governance — SEI holders vote on protocol upgrades, parameter changes via on-chain proposals
  • Liquidity incentives — SEI emissions used to bootstrap DeFi protocols on Sei

Token Distribution Controversy

Sei’s initial token distribution attracted criticism:

  • Large allocations to team/VCs (~50% combined)
  • Community/ecosystem allocation relatively small
  • Multiple airdrop rounds attempted to improve decentralization metrics

Sei DeFi Ecosystem

Sei’s V2 EVM compatibility attracted Ethereum-native protocols:

  • DragonSwap — Uniswap V3 fork deployed on Sei EVM (primary DEX)
  • Jellyfish DEX — native DEX with order book support
  • Silo Finance — isolated lending on Sei
  • Levana (originally Cosmos) — perps, originally CosmWasm, exploring Sei deployment
  • Multiple EVM apps porting from Ethereum/Arbitrum due to lower fees + faster finality

Sources

Related Terms