Check a sealed extract.
Type the reference printed at the foot of an extract, or the full 64-character fingerprint.
What this check shows
Only whether the extract matches the entry it names in a sealed book, Keel's own record of the day it was sealed, and whether a later entry corrects it. It never shows the content of a register. Practice books, used for training, are never anchored and cannot be verified here.
Try it on the sample: the sample company has its own check.