London's Herodotus, in collaboration with StarkWare, has launched an "on-chain accumulator" tool that lets users read and verify any part of Ethereum's history. This tackles Ethereum's current limitation of validating only the last 256 blockhashes.
The tool uses "storage proofs," a cryptographic method, to confirm the validity of data. This could be a game-changer for creating permissionless account recovery systems and insurance protocols that rely on historical on-chain data.