The second point is more concerning. A related point is that it only works if the user already has a wallet installed that is listening on "openid:". "mailto:"

The second point is more concerning. A related point is that it only works if the user already has a wallet installed that is listening on "openid:". "mailto:" and "tel:" work on a phone since there is an email and phone app on all phones by default. This is a classic chicken and egg problem. Why would a developer use "openid:" if there are few, if any users, and why would a user install a wallet for "openid:" if there are no apps. Thanks for your encouragement! ... would love any other feedback you have. We believe Hellō is SSI (Self Sovereign Identity) -- decentralized approaches are one way to approach -- a distributed centralized approach like Hellō is another way that is more pragmatic.