Bad copy, definitely, but it's built on Bitcoin Dev Kit (BDK), so the foundation is rock solid.
Discussion
Proton's design is to only store your keys encrypted (by your browser or app) on their servers. The same privacy model you have with ProtonMail. The BDK based wallet code also runs locally in your browser (wasm) or phone app.
The code is open source so you're welcome to see exactly how it works. Certainly a trade off of user experience vs security, but better than the closed, fully custodial systems out there.
Yes, would make even more sense if they implement https://spark.info/ L2 Bitcoin when released.
they better be gonna make it open source or forget it lol
ugh typescript
also, that is just an SDK, that has to be open source, or at least open spec, or nobody can use it
In some days they will release it on https://docs.spark.info/



