I might include a basic 3 minute explanation of asymmetric cryptography, and how it's used in Bitcoin and nostr, with a diagram or two from Wikipedia
Discussion
So dive super technical.
I’m fear the audience will not find that engaging enough.
Maybe split it into 3 separate 1-minute explanations sprinkled at beginning/middle/late points in the presentation
How it's used in Bitcoin isn't quite relevant to Nostr.
I know it is partially the same, but Nostr is strictly a network protocol, much simpler than anything involving any blockchain. To involve Bitcoin would be an absurdity. HTTPS is likely more familiar to more people and so is PGP.
I think a basic explanation of Bitcoin is simpler to understand as a second example (aside from nostr)