entropyseal.com/

Neat tamper-evidence packaging concept: a random pattern of beads that's modified when you open the package, along with a smartphone app to automatically verify the pattern is correct.

Reusable glitter basically: to fake a seal, you need to make the significant effort of positioning each bead in the right place. Possible. But very time consuming.

I'd buy one!

@pete Isn't this is what people at ShiftCrapto working on?

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