Print the key on paper and put it in a safe. How is that not easy? Or etch the key on a piece of metal, seal it in plastic, and throw THAT in the ground, if yo

Print the key on paper and put it in a safe. How is that not easy? Or etch the key on a piece of metal, seal it in plastic, and throw THAT in the ground, if your are that way inclined! I don't see the difficulty.