I have my private keys stamped into metal that won't melt if the house burned down.
AND I have paper copies in another location, split up so you need both parts to complete the key.
I'm HODLing long term, so I wanted to be safe.
The metal is a great idea! What kind of metal, and how deep are the stamps?
It's actually two 10oz silver bars. The reasoning behind it is that it's something you're going to want to be careful protecting anyway, and the melting point of silver is around 1700 degrees F and a typical house fire burns around 1200 degrees F... Plus it's kinda neat
The stamped letters and numbers were hit relatively hard to make sure if the silver was scratched by something, everything would stand a great chance of being legible.