Although you are not aware, every message you write here is cryptographically signed by your private key which matches your public key, so we know the owner of the private key wrote it.

If you wish to verify your identity beyond the fact you hold your private key, then you can optionally verify your identity by storing your public key on a webserver, either yours or somebody else you trust.

If you own the website, you can prove that the owner of the website also owns the private key that signs each message posted here on NOSTR.

If you look at my profile, you will see I am verified as mike@mikehardcastle.com which means I stored my public keys on my website in this file here: