The VPN should be integrated at the OS level not browser level.
No, it doesn't. It just proves that you own/hold a private key. You need to build an identity protocol on top of that if you want to prove that you are a specific person/organization. Such protocols have been around for quite some time before crypto currencies. It's just they don't have a good UX, that's why most websites require a password based authentication instead of a key/certificate.
I like a lot JWT/JWT as it has a lot of useful attributes(. e.g the "acr" attribute) so you better start with that than a crypto wallet
I have been wanting what the op describes for a long time - why do we have to "create" accounts? Why can't we simply tell the site our account with our request. For a dumb example, having "?publicKey=(key)" in the url. That way the site can know who we are and be able to link our profile, provable by our ability to sign using the private key, does away with login forms, does away with password recovery flow, does away with email single-point-of-failure, allows us to switch profiles easily, etc. It's mind-boggling that every site in the world rebuilds login logic.
Your statement makes me very curious because as far as I'm aware, key distribution is the core problem of asymmetric cryptography. I can generate a private key and say I'm you, and there's nothing stopping me from doing that.
The only solution I'm aware of so far is DNSSec which starts from the operating system level.
> cost
All currencies have an acquisition cost, usually in the low percents. Bitcoin is actually on the cheaper end these days at around 10-25 bps.
> volatility
Prices of things are reflections of the aggregate opinions of those things by everyone in the market. When prices are volatile, that means people's opinions of those things are volatile. And that's because those things have a lot of unknowns associated with them. As time goes on, and society observes the thing more and how it behaves in different circumstances, the better people will be able to predict the effect of future events, and the lower the volatility will be. In a thousand years, for example, when almost any possible event that could have happened to Bitcoin has happened, volatility could be near 0, and price will probably appreciate predictably with population growth.