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FWIW: from my experience people have no idea what is "ledger", especially non-native english speakers... I had no idea what that means before learning about Bitcoin.
I think this is fine, as long as they can grasp the overall concept of a ledger.
Sometimes people will ask why we haven't had a trusted public ledger before Bitcoin, at which point I will discuss the problem of everyone keeping their own copy and the double spend problem
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