Document seal
“Our first monthly transparency statement: chain integrity, activity, and governance for September 2026. The document itself is included in the seal, readable by anyone, forever.”
The sealed document itself is included in this seal, with the same permanence as its fingerprint: download transparency-statement-2026-09.pdf. The download is provably the sealed bytes; its sha256 equals the fingerprint below.
Have the document? Choose it and the fingerprint is computed here in your browser; nothing is uploaded.
The proof bundle contains the sealed block, the author’s public key, and the exact recipes. The verifier is a single dependency-free script; read it before you run it.
Proof bundle (JSON)Independent verifier (node)Signed chain tipRaw chainOpen protocol spec
node verify-seal.js proof.json --document your-file
Place this next to the statement on any site; it links readers back to this certificate.
<a href="https://heartwoodlibrary.org/seal/5c4faaaa8289cfb0d870a16c8dffa111575d1eadb28b3941118b50a840d5395d"><img src="https://heartwoodlibrary.org/badge/5c4faaaa8289cfb0d870a16c8dffa111575d1eadb28b3941118b50a840d5395d.svg" alt="Sealed in Heartwood Library" width="252" height="36"></a>
The QR encodes this certificate’s address, so any phone camera becomes the verification entry point: print it on the cover page, the report footer, the poster. Scan, land here, check the copy. No app needed.