Tamper check

intact Every entry links to the one before it. Latest entry: #350A short code computed from a file's exact contents. Change a single character and the code changes completely. b83b7c8492272ad9e404c7b4797e433eaf4136a59e3cd5027afeda595fdb66b6

Each entry locks the one before it, so tearing out a page leaves a gap you can see. What it cannot do on its own is stop somebody who controls the whole database from rebuilding the logbook from a chosen point — every page would agree with the next, because they were rebuilt together. That is what the published totals below are for. The other known answer, signing each entry with a key the database never holds, is not built, and we would rather say so than let you assume otherwise.

all match 2 of 2 published totals still match what this logbook adds up to.

At chosen moments the logbook’s running total is written down somewhere else. Once a total is out, no amount of rebuilding inside the database can make the logbook add up to it again, and the earliest total that disagrees says roughly when the rebuild happened. To be clear about what is built: the mechanism works, and you can watch it catch a rebuild. Where the totals should actually be kept — a witness service, another office’s system, a partner’s, a printed page in a binder — is a decision nobody has made yet. Right now they sit next to the database, within reach of anyone who can edit it, which makes them worth nothing as assurance. The mechanism is the same wherever they go.

matches Overhead detector — version 1.0 62 documents checked · accredited

seal intactA fingerprint of exactly what was decided and the evidence it rested on. Edit anything afterwards and the seal no longer matches. Accredited by Accrediting official, judged as of 2026-10-24

matches Overhead detector — version 1.1 62 documents checked · submitted

matches Overhead detector — version 1.2 62 documents checked · submitted

matches Overhead detector — version 1.3 62 documents checked · under review

matches Coastal vessel classifier — version 2.3 59 documents checked · 1 allied partner approval checked · submitted