AdresX’s self-checking address codes

Field notes

The code lab maps coordinates to digits-only codes for 4.4-metre squares; the final digit is a check digit, and the demo lets visitors deliberately mistype or swap digits. A separate evidence ladder exposes inputs such as GPS accuracy, device integrity, local attestations, and agent presence. The page cautions that its sample points are city centres rather than building addresses, while national-postcode integration is not live and pilots have not started.