Uniswap Labs, the development company behind the decentralized cryptocurrency exchange Uniswap, announced last weekend that its Ethereum Layer 2 network Unichain is expected to launch a public mainnet in early 2025, with plans to integrate permissionless fault proofs on the first day of the mainnet launch.

Back in October, we announced Unichain. Today we’re sharing the official Unichain roadmap to public mainnet and beyond. And we're also announcing that Unichain will go live with permissionless fault proofs from day one pic.twitter.com/BFtE9jvbIA

— Unichain (@unichain) December 20, 2024

Unichain is built on top of the OP Stack as an Optimistic rollup, aimed at addressing the challenges faced by decentralized finance (DeFi) and achieving seamless multi-chain exchanges through initiatives such as becoming part of the Optimism Superchain and ERC-7683.

Unichain is currently running on the Sepolia testnet of Ethereum, having processed over 50 million test transactions since October and deployed over 4 million test contracts. According to Uniswap, all key services of Unichain Sepolia have maintained over 99% uptime.

Starting January 6, 2025, Unichain Sepolia will undergo scheduled maintenance to enable permissionless fault proof functionality, which developers plan to integrate on the first day of the mainnet launch. Permissionless fault proofs allow any participant to verify the current state of the blockchain and challenge illegitimate fund withdrawal operations, thereby enhancing the security of the network. Fault proofs, as a mechanism of Ethereum Layer 2 networks, allow users to challenge potential fraud or erroneous transactions.

After completing maintenance and security verification, the Unichain mainnet will be open to the public. This phase will allow users to bridge funds to the network and start using applications built on Unichain. New features are also planned after the mainnet launch, including the highly anticipated Flashblocks, which can reduce block time to 250 milliseconds, making transactions nearly instantaneous.

Unichain also plans to launch a decentralized validation network, Unichain Validation Network (UVN), to address risks associated with a single sequencer architecture. Uniswap stated that UVN allows nodes to validate blocks, which will add an additional layer of finality and reduce the risk of conflicts or invalid blocks. To become a validator in UVN, node operators must stake UNI on the Ethereum mainnet.

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