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why we store interfaces onchain. you write iron-clad mathematically verified smart contracts. your gas optimization is clean, your state logic is bulletproof, and your evm primitives are pristine. but how do your users actually interact with your protocol? through a traditional web2 domain hosting a react app hosted on vercel or some centralized CDN. one compromised DNS record, a malicious npm dependency injection, or a rogue proxy update later, and your pristine smart contract is wrapped in a ui draining user wallets via a malicious approve() call. code was law onchain, but offchain frontends were anarchy. enter ERC8244: contract hosted application html. ethereum-magicians.org/t/erc…. by standardizing how smart contracts serve their own self contained html/ui directly via an html() external view returns (string memory) method, erc8244 bridges the gap between state and interface. here is why storing interfaces onchain changes everything for privacy and security. 1. code is law: extending immutability to the ui layer. for years, “code is law” stopped abruptly at the browser boundary. erc8244 forces the interface to inherit the exact same security properties as the underlying smart contract: - permanent provenance: when the ui layout, styling, and logic are stored onchain (using sstore2 style patterns or direct contract storage), they share the immutable lifecycle of the deployment. - zero hostile takeovers: because the interface is returned directly by an onchain view function, no third party server can inject malicious scripts, alter routing, or silently pivot the frontend code behind your users’ backs. what is deployed on the evm is precisely what gets rendered. 2. radical privacy through self contained isolation. traditional dapps bleed data. they ping cdns, load third party analytics trackers, fetch remote fonts, and expose user metadata to centralized infrastructure providers. erc8244 hardcodes strict isolation boundaries into how clients must render contract hosted apps: - no external network dependencies: the specification explicitly forbids external network resources, remote url(), fetch(), or XMLHttpRequest calls unless integrity checked(like subresource integrity or content addressed URIs). - sandbox enforcement: conforming clients render these interfaces inside a iframe with a default deny CSP. they cannot inherit cookies, local storage, or ambient network access from host pages. your users’ session data and interaction patterns stay strictly between their wallet and the node. 3. gateway independent trust and decentralized resilience. when web2 infrastructure goes dark or gets censored, your dapp disappears. with erc8244, frontends become as portable and censorship resistant as the blocks they ride on. - any RPC provider or decentralized gateway can fetch the html() payload directly from the state. - wallets can natively inspect, parse, and render fully functional interfaces without ever trusting an intermediary web server. scaling stuff onchain isn’t just about rollups and cheaper gas, it is about eliminating every single trust assumption between the user and the execution layer. storing interfaces onchain ensures that the window into your protocol is just as trustless, verifiable, and immutable as the smart contract itself. ==eip.tools/eip/8244.