[Crito]

I can see where you are coming from, but how could you word that to be technically correct, succinct (not a full blown lecture on what bitcoin is), and not leave yourself open to giving people that impression?

Bitcoin isn't the simplest concept around. Unless you are in the business of packaging up bitcoin for non-technical consumers, I think it is reasonable to expect your users to bring some knowledge about bitcoin to the table.

[Philadelphia]

"This site allows you to navigate through a copy of the bitcoin blockchain"

[Crito]

Yeah, that's definitely better. You might still have people falling into the weird "the blockchain is a bunch of html documents" hole though.