Guillaume L.

Hey StartupBase 👋 I'm Guillaume, the maker behind Proxae. Quick context on what it is and why I built it. The problem — too many friends had the "I had this idea first" story with no usable proof. A writer whose manuscript came back rephrased from a publisher, a designer whose logo resurfaced rebranded, a dev who saw his algorithm in someone else's repo. The existing tools all felt out of touch:

Patent offices (INPI etc.) are for protection, not for proving when something existed Sealed envelopes (enveloppe Soleau in France) are 7 paper pages, archived physically, renewable for a few years Bailiff certifications cost €200–€800 per document Mailing yourself a registered letter has been ruled inadmissible by most courts

The build — Proxae hashes your file or text in your browser (Web Crypto API, SHA-256), then anchors that hash into the Bitcoin blockchain via OpenTimestamps. Anyone can verify the proof against the blockchain, forever, without an account and without trusting us. A few things I'm proud of:

Your content never reaches our servers — by architecture, not by policy. We literally couldn't read your files even if we wanted to. Bitcoin anchoring is batched through OpenTimestamps, which is what makes a generous free tier sustainable (thousands of proofs aggregated into a single Bitcoin transaction). The Pro tier (€4.90/mo) adds eIDAS-qualified RFC 3161 timestamping by Sectigo — same legal weight as a notarized act in the EU. Available in 5 languages (EN/FR/ES/PT/DE), all hand-translated.

Stack for the curious — Laravel 12 (PHP 8.2), MySQL, Cloudflare in front, Stripe + Stripe Identity for billing and optional KYC, Sectigo for the qualified TSA, Umami for privacy-first analytics. Hosted in Europe. What I'd love feedback on:

Does the free tier feel generous enough for occasional use? Is the distinction between "free anonymous" / "free with account" / "Pro" clear from the pricing page? Any use case you'd expect to see and don't?

Happy to answer anything — technical, legal, or otherwise. The OpenTimestamps + eIDAS combo is genuinely interesting from a crypto/legal standpoint, ask away 🍻 — Guillaume

Nice project and nice website! Good job!

I had a ssl problem when I tried to used it, you should take a look

Congrats for your product!