Akashi Notari: Prove any file existed. On-chain timestamp. In 60 seconds.

Hey Product Hunt! 👋 I'm excited to launch Akashi Notari, a tool I've built to solve a simple problem: how can you prove a file existed at a specific time? Akashi Notari is a simple, private dApp for creating an on-chain Proof of Existence. It lets you anchor any file's cryptographic hash on the blockchain in under a minute for under a dollar, proving your file existed at that exact time. Your privacy is 100% protected. 🔒 No Uploads: Hashing happens entirely in your browser. Your file never leaves your computer. ⚡ Fast & Simple: Go from file selection to a confirmed transaction in ~60 seconds. 📄 Instant PDF Certificate: As soon as the transaction confirms, you can download a formal certificate with the hash, timestamp, and a direct link to the on-chain proof. I built this specifically for people who need simple, affordable proof: - Freelancers & Contractors: Prove exactly when you delivered that design, code, or document to a client. Stop payment disputes before they even start. - Creators & Artists: Protect your intellectual property. Get a verifiable timestamp for your music, art, or video before you publish it online or share it. - Solopreneurs & Small Biz: Timestamp contracts, proposals, and business records for a fraction of the cost (and none of the hassle) of traditional notarization. - Anyone who needs simple, fast and reliable "poor man's copyright". How it works: 1. Drag & drop (or select) any file. 2. Connect your wallet (MetaMask, WalletConnect). 3. Click "Verify on chain." 4. Download your certificate. 5. Anytime in the future prove your file was there! It supports Base, Ethereum Mainnet, and Optimism. I'd love for you to try it out! App: https://akashi-notari.com/ Certificate Retrieval: https://akashi-notari.com/certif... Let me know what you think!