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Memo 0xa957c819…bc0a8c on Ethereum

Continuing to streamline TypeScript types, internal data structures and state management across the app. Migrated from ethers.js to viem + abitype for onchain queries and interactions. Added support for several OP Stack-based chains. Wrote a full-featured REST client in TypeScript for the Etherscan/Blockscan family of APIs (with autocomplete help from GitHub Copilot!). https://ethglobal.com/showcase/blockhead-ko74p