Only Layer

Only Layer is an EVM-compatible Layer 2 that runs optimistic rollup and zero-knowledge execution paths under one sequencer. Ordinary transactions take the optimistic route, where a fraud proof can be submitted inside the dispute window; cases that need faster certainty generate validity proofs that an on-chain contract checks before settlement. The network keeps the Ethereum toolchain, so Solidity contracts and common development frameworks port over directly. Users move assets in through a bridge and pay fees in the native token.

The design centres on scheduling proof cost against settlement speed: the sequencer picks a path by transaction type and size, batches compress many state changes into a single proof, and the verifier contract only checks the aggregated root. In June 2025 the project partnered with INTO to connect a social account system to its wallet and quest modules, letting one identity claim characters and points inside the app. The bridge uses a lock-and-mint model, with mainnet assets held in the bridge contract and a 1:1 representation minted on the Layer 2, while withdrawals wait out the challenge period. Against rollups that run a single proof system, the dual-track arrangement lets small frequent interactions and high-value settlement each match their own cost profile.