not a very good digital id. but certainly a digital identity. you can use it to sign challenges, which makes your authentications non-reusable (very good against identity theft). but extremely linkable/traceable.
Discussion
Traceable and linkable to this pseudonym? I am fine with that.
you shouldn't be. control over where you can be traced and where you can't be traced but still authorized is important.
nostr is such a simplistic solution. it's a lot better than some alternatives but very very far from ideal.