my PGP signed btc address?
you can sign messages with your bitcoin private key too. if you want to use a bitcoin address to verify your identity (for account recoveries for example) then do that instead.
but also there is another topic in the reputation board where you can post your PGP public keys if you want to use that instead of a bitcoin address:
https://bitcointalk.org/index.php?topic=1159946.0or you can post both!