Turning this from concept to reality would be a huge undertaking. It would mean re-architecting how major rollups like Base and Arbitrum work. Some of the key steps: • Standardization: Core teams (EF, Base, Arbitrum, others) would need to agree on a common "Unified Vault" standard (functions, proof formats, Merkle structure). • Mainnet contracts: Build & audit the Vault itself (holding assets, verifying rollup proofs), plus a registry for rollups and verifier contracts. • Rollup modifications: Sequencers would no longer just custody assets. They’d also compute balance changes, post a proof + root to the Vault. Fee payment would need account abstraction and Paymasters. • Ecosystem: Wallets and dApps would need rewrites to treat some balances as always L1-native, with rollups acting as execution workspaces. • I imagine we'd need some solution for optimistic rollups' delayed finality. If achieved, it could unify the ecosystem around Ethereum as the true World Ledger. That being said,...
If Ethereum L1 is the World Ledger, then base assets should never leave it. Classically, rollups both execute your transactions and hold your balances until you bridge them back. That works for scaling, but it fragments liquidity and makes direct Mainnet interoperability harder. A different design would keep all assets locked in a Mainnet vault, with rollups used only for high-speed execution. Instead of holding your funds, the rollup periodically posts a single proof plus a root of per-account balance changes. When you want, you "pull" your update back to Mainnet with a small claim. That means 100 trades on a rollup → 1 net update on Mainnet (e.g. +500 USDC, –0.2 ETH). Your vault always lives on Mainnet, secured by Ethereum itself, while rollups are simply fast workspaces that batch and compress activity. Why this works: • The rollup commits only a proof and a compact root, not every transaction. • Users prove their own balance change with a short inclusion proof when they claim....
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