UploadToBlockchain - Prove any file existed, sealed on Bitcoin and Arweave
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UploadToBlockchain proves a file existed on a given date — no account, pay per upload.
Your file is hashed (optionally encrypted client-side with AES-256-GCM, so even we can't read it) and stored permanently on Arweave, giving you a public, verifiable record. Add a Bitcoin-backed certificate via OpenTimestamps — it only ever sees the hash, never the file.
Built for creators and freelancers who need solid proof of prior existence. $4.99 per proof, $9.99 with Bitcoin. Up to 50MB.
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Hey Product Hunt 👋
I built UploadToBlockchain after one too many conversations about "proof of existence" where the only answer was "email it to yourself" — which proves nothing, really.
The idea is simple: hash your file, optionally encrypt it in your browser so even I can't read it, store it permanently on Arweave, and optionally anchor the hash into a Bitcoin block. No account needed, you just pay for what you use.
I'd love feedback, especially from anyone who's dealt with proving prior art, timestamping contracts, or protecting creative work. Happy to answer anything about how it works under the hood too.