by weitendorf | 2025-08-02 09:49:03+00:00
Correct, because to fully leverage self-signed (or distributed or decentralized or whatever) JWTs you have to handle identity in a different way than typical consumer auth works on the Internet today.

Right now, user identity is ~based on email, which is in practice very often delegated to a third party like gmail, because most people do not host their own email. So identity = foo@bobsemailservice.cool. To properly validate self-signed JWTs you'd have to instead either host or delegate distinct JWKS endpoints for each identity. Then identity = https://bobsjwkshost.fun/foo. You still have to create and verify an account through a third party, otherwise, your self-signed JWT is just as credible as a self-signed TLS cert.

In both cases the underlying identity model is actually based on DNS, IP, and internet domains - whoever controls those for your email/JWKS controls what gets served by those addresses. So to fully self-host email or JWKS you need to own your own domain and point email/http to IP addresses or other domains. And you need to have something servery running under that IP to handle email/https. That's a big hurdle to setup as is, but even so, all this really does is kick up identity delegation one more notch to the IANA, who decide who owns what domains and IP addresses, by delegating them to registrars and regional Internet registries, with further delegation to AS to actually dole out IP addresses to proles.

I recently started the process of becoming a registrar and securing my own IP addresses and realized THERE ARE STILL MORE LAYERS. Now I have to pay a whole bunch of money and fill out paperwork to prove my business' legal legitimacy and get the stupid magic Internet numbers we call IP addresses. Which then relies on my country's legal and financial systems... And by the way, this part is just completely infeasible for a regular user to actually follow through with (costs are high five digits USD or low six digits USD, IIRC, takes a ton of time).

Because the IANA is a stodgy bureaucratic Important Institution That I Cannot Change, IMO the best way to implement self-hosted auth is by making it as cheap and simple as possible to register a domain and serve email/jwks on it. If we pay them even more money they'll give us a TLD which we should be able to make available for $0.20 (IANA base registration fee because of course) or just eat the cost and make it free pending some other verification process. And then we can set up a portable "serverless" JWKS/SMTP handling tool that people can run.

I've been thinking about this self-hosted identity/auth problem quite a lot and I think there's no ideal solution. If you're fully decentralized and trustless you're probably using "blockchain" and won't have enough throughput, will lock people out of everything online if they lose a key, and will still probably make consumers pay for it to stave off sybil attacks. Also, to use the internet you have to trust the IANA anyway. So just upgrade every authenticated user into their own identity provider and make it extremely cheap and easy to operate, and at long last you can get those precious seconds back by signing up for Internet services with a JWKS path instead of an email address.