you know, there is more than one idea contained in the creation of bitcoin. so when people say "where did you get the idea", the pretty clear completion of the question is "where did you get the idea for bitcoin" but there are various concepts within bitcoin.

where did you get the idea for a public ledger?
where did you get the idea for a cryptographically secure coin?

when people ask "where did you get the idea" it makes me wonder what "the idea" means to them.