You need a merit or need to have just fun?
Let us have fun.
You want both? We should sign a message with bitcoin address and you want us to also send an encrypted message by using your PGP public key? Or only the second one which is PGP?
You can not encrypt a message using bitcoin signed message. You need PGP key. So the game is only for PGP key. You must add current date in the
secret message you have for me and no one else should be able to read it except me [that's why it is encrypted].
I will post the decrypted message however If you feel uncomfortable then add it in your encrypted message, I will not post it to honour your request.