Among the companies specializing in analog security of cryptocurrency investments is Coinplate. The flagship product of this manufacturer is the metal crypto wallet. It is used to store and protect the seed phrase necessary to access virtual funds.
Thanks to the use of a durable material that is resistant to weather conditions, but also high temperature and humidity, the plate can be stored for many years. The manufacturer recommends using additional security measures, e.g. tamper-evident stickers. A steel wallet looks inconspicuous and is a perfect way to hide important keywords, and thus secure the investments.