Hodlr Swiss can be purchased at hodlr.swiss/. Claims to be:

  • 100% Marine Grade Stainless Steel
  • Fireproof up to 1,350 °C (2,460 °F)
  • Waterproof
  • Shockproof


This center punch takes some getting used to because instead of putting divots in empty squares you’re punching them on top of raised letters. At a glance it’s not as easy to tell what letters are encoded.

Heat Stress Test

No data loss.

Corrosion Stress Test

No data loss.

Crush Stress Test

My hydraulic press was unable to visibly deform the HODLR Swiss. Unfortunately, my crush test managed to completely lock up this device. It’s no longer possible for me to rotate the disks in order to unscrew the outer ring. I’m 100% confident that the data inside is still intact, but I don’t have the tools necessary to access it.

Having a shell to visually prevent anyone to directly see or take photos of the seed is an intentional design decision by Hodlr Swiss. The fact the shell gets locked during destructive events works in the same way. It puts an additional security layer in extreme cases that may require a long period of time before the owner gets the Hodlr back. For example, a house collapse may take weeks to get cleared.