The Outline of History
USBNUAZJA136WFYXF
WSBNWC17225YANQAM
The Universal
Standard Book Number
A deterministic, registry-free identifier for books — computed from the title page alone. No central authority. No fees. No gatekeepers.
Calculate · USBN
UAZJA136WFYXF
WC17225YANQAM
The ISBN system, standardised in 1970, has given every new book a number. The roughly sixty million editions that came before have no such identifier, and the only alternatives — OCLC control numbers, Library of Congress control numbers, Open Library identifiers — all require a registry, a membership, or prior cataloguing by someone else. A used-book dealer holding a 1923 volume that no institution has previously catalogued has no standard identifier to point to at all.
USBN is the alternative: compute the identifier from the book itself. Hash the title, author, and year — as printed on the title page — into a thirteen-character string, using an algorithm anyone can run on a laptop or in a library terminal. The same book, examined by two strangers on opposite sides of the world, yields the same USBN every time. No network. No registration. No fees.
How a USBN is computed
-
Read the title page
Transcribe the title, author, and publication year as printed. Diacritics, case, and extra whitespace are normalised away so two catalogers in different locales produce byte-identical input.
-
Hash with BLAKE2s
The normalised string is hashed with BLAKE2s to produce a 64-bit digest; the top 60 bits are taken as the book's fingerprint.
2⁶⁰ ≈ 1.15 × 10¹⁸. -
Encode in Base32
The 60-bit fingerprint is written in Crockford Base32 — twelve characters — and prefixed with
U. The result isU + 12 chars = 13 chars, exactly the length of an ISBN-13.
Some books with their USBNs
The Elements of Style
USBNU4TMJP8GE1DSF
WSBNW4NPQT7637D53
Über die Relativitätstheorie
USBNURAYHF9EDXKGQ
WSBNW718QV0NXA405
College Calculus with Analytic Geometry
USBNUGM4Y9KZVGYH7
WSBNWDYNK8KP7FHSG
Notice that different printings of the same work share a
WSBN — a companion work-level identifier —
while each edition still has its own unique USBN.
What USBN is good for
- Used-book dealers get a common identifier across platforms without coordination or API integration — every seller computes the same number from the same edition.
- Libraries can catalogue pre-ISBN holdings and link them across union catalogues without waiting for OCLC membership or record assignment.
- Digital humanities projects can cite pre-1970 texts with stable, reproducible identifiers instead of fragile URLs and drifting database keys.
- Personal libraries get a portable, tool-agnostic identifier that survives the migration from LibraryThing to Goodreads to whatever comes next.
- Citations and footnotes can include a USBN alongside the prose reference, enabling future reconciliation with any bibliographic database.
The paper
USBN: A Deterministic, Registry-Free Identifier for Pre-ISBN Books
Submitted to The Code4Lib Journal
The formal presentation of USBN v1.0. Introduces the algorithm and the canonical normalisation pipeline; analyses collision probability against the estimated sixty-million-edition pre-ISBN corpus; documents the four defects in the original draft that motivated the v1.0 rewrite; argues for thirteen characters on the grounds of ISBN drop-in compatibility; includes complete reference implementations and a full test vector table.