Astar, AltLayer, and EigenLayer unite to launch Fast Finality Layer — Empowering ASTR as Soneium’s staking backbone

Astar Network, AltLayer and EigenLayer have partnered to launch a Fast Finality Layer for Soneium, an Ethereum Layer 2 developed by Sony Block Solutions Labs, aiming to cut transaction finality from roughly 13–15 minutes (Ethereum’s L1 finality) to under 10 seconds. The Fast Finality Layer is implemented as an EigenLayer AVS (Actively Validated Service) built by AltLayer using its MACH (Modular Actively Validated Checkpointing) system, and secured by a dual‑token model of restaked ETH and Astar’s ASTR token, making ASTR a core staking asset for Soneium’s infrastructure. Soneium currently inherits Ethereum’s security but also its slow finality, which is problematic for latency‑sensitive use cases such as gaming, DeFi, NFTs and SocialFi. The new Fast Finality Layer introduces a decentralized network of validators that verify Soneium rollup state transitions off‑chain and provide crypto‑economic finality guarantees in under 10 seconds, exposed to developers via a dedicated RPC endpoint that marks blocks as final. This reduces reliance on centralized sequencers, strengthens cross‑rollup interoperability, and offers developers near real‑time confirmations while keeping Ethereum as the ultimate settlement layer. For Astar, the collaboration is a key milestone in Astar Evolution Phase 1.5, which focuses on turning Astar into a more collective network and expanding ASTR’s role beyond its home chain. By integrating ASTR with EigenLayer and AltLayer’s MACH, ASTR becomes a shared security asset that can be restaked to secure Soneium’s Fast Finality Layer, providing new staking utility and reward pathways for ASTR holders while contributing to Ethereum’s broader restaking ecosystem. For Soneium and its backer Sony Block Solutions Labs, the upgrade positions the chain as a higher‑performance, economically secure L2 aimed at consumer‑facing and creative applications that depend on fast, reliable transaction confirmation.

✨ AI-generated background, compiled from web sources — not editorial content.

More coverage

• Fast Finality Layer for Soneium - AltLayer Documentation (docs.altlayer.io)
• Astar Network (x.com)
• Soneium Slashes Finality by 98% With Astar Network, AltLayer, and ... (tradingview.com)
• Fast Finality Layer for Soneium - Powered by Astar Network ... (soneium.org)
• Proposal to Build a Fast Finality Layer for Soneium with ASTR and ... (forum.astar.network)

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