You can sign every message on bitcointalk with a bitcoin address. And all your posts will be securely protected

For example:

-----BEGIN BITCOIN SIGNED MESSAGE-----
Users can currently send/post incorrectly quoted messages to assist in scams or discredit other users.

This could be addressed by having a hash generated based on the content of a message, and then a checksum implemented to reject invalid quotes from being sent/reposted.
-----BEGIN BITCOIN SIGNATURE-----
Version: Bitcoin-qt (1.0)
Address: ###################################

######################################################################
-----END BITCOIN SIGNATURE-----