OP Stack layer 2 (Soneium)

Soneium is an Ethereum layer 2 built by Sony Block Solutions Labs, a joint venture of Sony Group and Startale, on Optimism's OP Stack. Its mainnet went live on 14 January 2025 and publishes its transaction data to Ethereum. L2BEAT lists it as an optimistic rollup that has not yet reached Stage 0 of its decentralization scale.