HashChan

HashChan adds a decentralized, censorship-resistant comment sidebar to YouTube videos, Wikipedia articles, and Rotten Tomatoes reviews. Threads live on-chain via the HashChan protocol — no central server, no moderation, no takedowns. How it works When you open a supported page, HashChan checks for an existing on-chain thread for that page. If one exists, you can read and reply to posts. If not, you can start the first thread. Your Ethereum wallet signs each post — that's it. No account, no email, no profile. Features - Per-page threads anchored to the page ID (video ID, article slug, or movie slug) - Supports YouTube videos, Wikipedia articles, and Rotten Tomatoes reviews - Markdown editor for posts with live preview - Doubly-linked reply structure — click a back-reference to scroll to the citing post - Browse all threads for the current site in the Home tab - Reverse-chunked indexing for limited RPC endpoints - Sidebar with Alt+H shortcut, remembers open state across pages - Works with any injected Ethereum wallet (MetaMask, Rabby, etc.) Non-commercial & open source HashChan collects no data, takes no fees, sells no tokens, and has no revenue model. The wallet is used solely to sign on-chain posts. Gas fees go to the network — nothing goes to us. The full source code is available on GitHub. Getting started 1. Install a browser wallet (MetaMask or similar) 2. Connect to a supported network (Sepolia testnet recommended to start) 3. Open any YouTube video, Wikipedia article, or Rotten Tomatoes review and press Alt+H or click the HASHCHAN tab on the right edge 4. Head to Settings to confirm your boards are detected 5. Start or join a thread