Capture every idea, sketch, prototype, and lab note. LeoLog quietly hashes your work on your own device, anchors the fingerprint to Bitcoin and Base, and gives you a court-admissible Certificate of Existence — privacy-first, by design.
Certificate of Existence
Issued · 2026-04-30 · 14:02 UTC
Modern R&D moves across cloud drives, chat threads, and AI tools faster than provisional patents and paper notebooks can keep up. LeoLog gives every entry a quiet, durable timestamp — so your idea is provably yours the moment you write it.
You write. We hash, encrypt, anchor, and certify. Nothing about your work ever leaves your device unencrypted — only the cryptographic fingerprint touches the chain.
Type a note, draw a diagram, drop a CAD file, or auto-import lab data. Threaded entries, full version history, and team mentions — built like a notebook, not a ticket queue.
The client takes a SHA-256 of the entry and encrypts the contents with AES-256-GCM before anything leaves you. Plaintext never crosses the wire — only the fingerprint does.
Your fingerprint is batched into a Merkle tree and anchored to Base L2 (fast confirmation, ~2 minutes) and Bitcoin via OpenTimestamps (durable finality, ~2 hours). We pay the gas. You don't think about it.
One click prints a Certificate of Existence — a portable PDF plus a JSON proof bundle. Anyone can verify it independently at verify.leolog.io, even if LeoLog is gone.
The same quiet, considered surface — adapted to the pressure points of solo creators, academic teams, founders, enterprise R&D leads, and the lawyers who defend them.
Affordable, instant proof of creation before a pitch, a contractor brief, or a Discord drop — without learning a wallet.
Verifiable lab records aligned to your publication and grant timeline. Every plot, dataset, and revision sealed in time.
A defensible IP trail for investor diligence — clean attribution and irrefutable creation dates across every cofounder.
Audit-grade invention records across distributed teams, with SSO, role-based access, and sovereign-jurisdiction options.
A pre-structured evidence layer for clients — court-admissible bundles you can hand a clerk without translation.
Authorship and creation-time provenance for code, RFCs, and design notes — independently verifiable, decades from now.
The boring, careful decisions you would have made yourself — already made, already shipped, already audited.
Your work never touches the blockchain. We anchor a one-way SHA-256 of your entry — and only that. Plaintext is encrypted with AES-256-GCM on your device before it ever leaves you.
Speed when you need it; permanence when it matters. Every entry is anchored to Base L2 for fast, demo-ready confirmation, then to Bitcoin via OpenTimestamps for finality that outlives any single jurisdiction or vendor.
Every entry exports a Certificate of Existence — a typeset PDF plus an open JSON proof bundle. Aligned with EU eIDAS 2.0, US FRE 902(13)(14), and the formal blockchain-evidence rules emerging in Italy and the Chinese Internet Courts.
Every Certificate is a typeset PDF with a verifiable on-chain footer — and a JSON proof bundle anyone can replay against the public chains. No subpoena required. No vendor lock-in.
The blockchain is the witness. We are merely the calligrapher. Every Certificate ships with everything a third party — or a clerk, or a future you — needs to verify your work, with or without us.
No. Only a SHA-256 fingerprint of your entry is anchored. Your text, sketches, files, and lab data are encrypted on your device with AES-256-GCM and stored under your control. The chain is a witness — not a publisher.
None. LeoLog batches thousands of fingerprints into a single anchoring transaction, so per-entry cost is negligible and we cover it. You will never see a wallet address, a seed phrase prompt, or a gas estimator inside LeoLog.
Different jobs. Base L2 gives a fast, demo-ready confirmation in around two minutes — useful when you are showing work in a meeting. Bitcoin via OpenTimestamps gives durable finality in around two hours, on the most resilient public ledger we have. You get speed and permanence without choosing.
Blockchain timestamping is being formally recognized in EU eIDAS 2.0, Italian DL 135/2018 Art. 8-ter, the Chinese Internet Courts, and US Federal Rules of Evidence 902(13) and 902(14). We are not a law firm, and admissibility depends on jurisdiction and case — but the underlying mathematics is independent, replayable, and increasingly bench-recognized.
Every Certificate of Existence is a self-contained PDF and JSON bundle. Anyone — you, your lawyer, a clerk, a future archivist — can verify it against the public chains using any OpenTimestamps client. Your proof does not depend on us being here.
Paper notebooks rely on the witness signing them, the lab keeping them, and a court trusting that chain. Provisional patents are slow, expensive, and disclose your idea to a government office. LeoLog is the everyday habit between those moments — a frictionless capture step that produces sovereign-grade proof every single day.
Begin your codex
Join the inventors, researchers, and founders quietly building an unbreakable record of their work. The first 25 entries are on the house, every month, forever.