[ecesena]

It’s explained in the link. I actually misremembered, it’s 196 bits.

[Terr_]

Never mind, with the benefit if sleep I see an error in my math.

Still, I wonder if a similar thing could be done by shuffling a deck of cards, and then riffling the results past a good camera so that an app can recognize the sequence in order. Perhaps it would be vulnerable to common shuffling mistakes?