nanalLabs BlogEveryone keeps records. The question is whether those records can serve as evidence. A document with hand-typed dates, or a cloud file with no edit history, has no answer to "how do we know you didn't write this later?" nanalStamp was built to answer that question.
Three sentences of how it works
- Write, and it seals. Write in Obsidian and pause; about five minutes later the note's content is automatically sealed as a SHA-256 hash. Every edit stacks a new version — earlier seals are never erased.
- At midnight, it anchors to Bitcoin. Each day's seals are batched at your local midnight and committed to the Bitcoin blockchain. Once confirmed in a block, no later modification can be hidden.
- Anyone can verify. Certificate PDFs, public verification links that need no login, and offline verification that runs without our server — the recipient doesn't have to trust us to check.
Privacy — only hashes leave your machine
Sealing uses the note's hash (a digital fingerprint). On the free tier, your content is never uploaded. Cloud storage of originals (WORM) is an optional paid feature — and even then, third parties who receive a verification link see only the hash, the time, and the block. Never the text.
Seals cannot be backdated
The principle — and the honest limitation — in one sentence: a record you don't seal today cannot be proven tomorrow. Evidence created after a dispute begins is no longer evidence. Provable history only accumulates forward, from the day you start.
Who uses it
Research labs with notebook obligations, companies preparing prior-use or trade-secret proof, and anyone who wants "I wrote this on that day" to be verifiable. About the service · Start free · 75 free record kits