http://us2wb7zqyxcielvrltluq6phbxjdf6daf7ithvj2p3n3lihvm2mqyyad.onion/register?invite=da7a8b

only works on a tor browser
iOS:
1. Install 'Onion Browser' from App Store
2. Open the app and wait for connection
3. Copy the .onion link
4. Paste it in the browser