I made a reusable tamper-evident jar for storing sensitive items

For the past few years, I have been working on a reusable tamper-evident jar for storing physical items.

The idea is that the lid creates a random physical “fingerprint” every time you close it. Inside the lid are thousands of tiny black and white balls. When you twist the jar open or closed, they mix. Once the jar is closed, the balls are held firmly in place, creating a unique pattern. When opened, unscrewing the lid mixed the balls, breaking the pattern.

You can take a photo of that pattern with your phone, and later compare it to check whether the jar has been opened. If someone opens it, the pearls mix again and the original pattern is gone.

I made it because I wanted a simple physical way to store things like hardware wallets, but it's also useful for hard drives, USB sticks, authentication keys, documents, etc. Basically anything where you might not need a safe, but you do want to know if someone has accessed it.

After a lot of hard work and prototyping, I'm happy to announce it's finally complete! Check it out on https://www.entropyseal.com/.

Happy to hear feedback. I’m especially interested in whether the concept is clear and what use cases come to mind. :)