Sei Network is undergoing its most significant architectural transformation since inception. With the finalization of SIP-3, the network is shedding its Cosmos-SDK dual-nature to emerge as a pure, high-performance Parallel EVM.
This is not just a software update; it is a "performance reset" designed to clear the path for the Sei Giga upgrade, targeting a massive throughput of 200,000 TPS.
1. SIP-3: The "Weight Reduction" Phase
To achieve elite speed, Sei is removing hundreds of thousands of lines of code. By deprecating CosmWasm and native Cosmos transactions, the network eliminates the complexity of supporting two different address types and execution environments.
• Model Shift: Transitioning from EVM + Cosmos dual-compatibility to EVM-only.
• Timeline: Most of SIP-3 is expected to conclude by End of Q1 2026, with the full transition finalized by mid-2026.
• Protocol Versions:
• v6.3 (Q1 2026): Full staking functionality migrates to the EVM; indexers/custodians transition to EVM APIs.
• v6.4 (Q1 2026): Disabling inbound IBC transfers, effectively cutting off new Cosmos-based assets.
2. Sei Giga: The 200,000 TPS Vision
Following the SIP-3 "cleanup," the Giga upgrade introduces a ground-up rebuild of the execution layer.
• Autobahn Consensus: A new mechanism allowing for parallel block proposals and asynchronous execution.
• Throughput: Targets 5 gigagas/sec, a projected 50x increase over current EVM standards.
• Finality: Sub-400ms transaction confirmation, positioning Sei as a leader for high-frequency trading (HFT) and institutional DeFi.
3. Critical Actions for Traders & Holders
The transition to an EVM-only environment creates immediate "bridge risk" for legacy assets.
Analytical Outlook
By narrowing its focus to the EVM, Sei is making a bold bet on the Ethereum developer ecosystem while utilizing its custom "Parallel EVM" tech to compete with Solana's speed. The removal of the "Cosmos overhead" should theoretically reduce latency and simplify the developer experience, potentially triggering a new wave of dApp deployments.
However, the success of this pivot depends on the smooth migration of liquidity. The Q1 2026 window is a high-volatility period for the SEI ecosystem as these technical changes go live.
Would you like me to track the specific governance vote dates for v6.3 and v6.4 so you can time your asset migrations?
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