I published this here some time ago, but here it is again. You can find the PGP key fingerprint in my X profile (as well as many other places). You have to substitute the npub in my profile with the at jimmysong in the string below.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512
I, Jimmy Song, attest that this is my Nostr Public Key: @jimmysong
-----BEGIN PGP SIGNATURE-----
iQEzBAEBCgAdFiEEwdeXvn0QUpEijNcM+qYX4yZ55FUFAmPcw90ACgkQ+qYX4yZ5
5FVNSwf+I+LMBsxa21fgGydqVrlewu9eW2+0XXF9V4w4+eZ1up13adbTo6MtkB07
nfO0QnX0w71KahcrQ8rOlvkY6E5k5ELBq9ft3vOV6zKsDaoIhSD34EbWgTOcFCkK
femb1RWGdQJ2mDgO1gWG84sb71s8H70vOiRI5Bl4QDBi/iCA5CovqsF2PhlXVu9g
l2nqIr67ILqZGPEX/k+t8WkQXvbUJZBY9VhF6ffTRztmqNTDUs1Jghjtr3p7uscF
6ZpI9NKbke1ZcfIRRDwr0+vKaUvUwBHjlRiQtWdcX2Km9N1gYuKQSY9Q55bk7Dn1
U4I5Izc69em5w/2HJj6hxkVvU4dFZw==
=ngfe
-----END PGP SIGNATURE-----