Not really, some etheads attempted something like this called TLSNotary that shares in creation of the TLS encryption key so that you, the person trying to prove content, can't modify it. But it doesn't necessarily prove it came from the SSL domain.

justin_shocknet

LAXITIVA

Fenix

Is there a way to create a verifiable proof that a specific site had a specific contents at a specific time? The "at a specific time" thing can be accomplished via opemtimestamps. But can you somehow use the ssl certificates to prove the origin of the site? Has somebody done something like that?