[Cryptography] Question about Bitcoin's security model

[John Levine]

It appears that Peter Fairbrother <peter at tsto.co.uk> said:
>The lies are first that it is a currency, which it obviously isn't - 
>apart from one famous incident, can you buy a cup of coffee with it?

Hey, I bought a coffee and an espresso with bitcoins in 2013:

https://jl.ly/Money/bitvend.html	buying bitcoins from a vending machine
https://jl.ly/Money/bitcafe.html	using them to buy coffee
https://jl.ly/Money/bitoops.html	trying and failing to cash in the rest

But I suppose that confirms your point.  At the current BTC price my
coffee cost about $1,000.

R's,
John