Im not sire what state of the art happens to be, but keyoxide is my personal favorite approach. There is of course keybase as well.
Keyoxide achieves the same result as keybase but is open and distributed. You store your proofs in your pgp key as metadata itself and upload it to a keyserver. So anyone with a copy of your public key, which they can always fetch from a keyserver, can verify your identity. Keyoxide is mostly just a gui tool/webapp to make it easy to display and verify someones proofs.
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