The registry
Every artwork carries a number. This registry says what that number produced: how many sheets were issued, and where each one stands.
The certificate of authenticity is a sheet of paper, signed by the artist, that travels with the artwork. One sheet per copy. This registry does not replace it: it lets anyone check, from the outside, that a number really exists.
You will find no names here, no date of a moment, no measurements. A registry exists to verify an artwork, not to learn something about whoever owns it.