So, much like a Premium Bond, then. These have been issued by the UK government since 1956, using an "electronic random number generator" that originally used v

So, much like a Premium Bond, then. These have been issued by the UK government since 1956, using an "electronic random number generator" that originally used vacuum tubes as a source of randomness... https://en.m.wikipedia.org/wiki/Premium_Bond https://en.m.wikipedia.org/wiki/Premium_Bond