Central Registry is the one shared place where players and shops sign up and get their keys. Shops never keep their own user accounts: they ask the registry "is this key real?"
What you can do here
Register as a player
Pick a username once and get your personal key. It's your identity across the whole game.
Register a shop
A shop claims a unique name and gets its own key. Shops do this by themselves on first start.
Join a shop
A registered player joins any shop and gets a key for that shop only, so one leaked key can't be used elsewhere.
Why it helps
One check for everyone
Shops and the PC Build Arena verify players and shops here instead of building their own logins.
Private by design
Keys are shown once and stored only as hashes. Only you can join shops under your name.
Easy resets
A shop can remove itself with its own key, so new game rounds start clean.
How to use it: see Help. Who is registered: Users · Shops · growth: Timeline.