Every print, every number, in public.
The Register is how a HankyCode print proves itself. Each printed code and side has a page with the fingerprint of its file and the numbers issued so far. Each certificate carries a QR in the code’s colour that opens its page. The whole Register is fingerprinted every day and stamped to the Bitcoin blockchain, so the record cannot be quietly changed — by anyone, including us.
What is recorded
Number, date, status and — if the owner chooses — one word. Never a name, never a price paid, never a value.
What the fingerprint is
A SHA-256 hash of the exact file the print was made from. Change one pixel and the fingerprint changes. Anyone can recompute it.
What the anchor is
OpenTimestamps writes the Register’s fingerprint into a Bitcoin block. Free, open, no wallet, nothing to buy. It proves the record existed and has not changed since.
The record · 610 prints
Blacks 20 prints
Whites & creams 6 prints
Greys & neutrals 18 prints
Reds 20 prints
Oranges & corals 42 prints
Yellows & golds 30 prints
Greens 40 prints
Teals & aquas 26 prints
Blues 22 prints
Purples 50 prints
Pinks & magentas 24 prints
Browns & tans 14 prints
Mature codes are registered in the archive (18+). Transfers and verification: hello@hankyfamily.com. Last built 2026-09-18.