Documentation
What does verified mean?
That the claim holds: the signature over the capsule checks out against the key it names, and nothing has been altered since it was made.
Verification answers a narrow question precisely, which is what makes it useful. It tells you that a particular key signed a particular capsule at a particular time, and that neither has changed since.
What it does not tell you
It does not tell you who the person behind the key is. An identity is a key, not a name — that is what lets it be checked by a stranger, and it is also its limit. If you need to connect a key to a person, that is a separate step, and one you should take deliberately.
Three outcomes, and they are different
Verified — the signature checks out. The claim holds.
Not verified — a capsule exists under that identifier and its signature does not check out against the key it names. This is the serious one. Treat the claim as unproven.
Not found — nothing has been registered under that identifier. Nobody made this claim. That is not the same as a claim that failed.
Anyone can do it
Verification needs no account and no permission from the creator. A claim that only its author can check is not proof of anything.