Recap: why does cold storage matter? The most effective way to keep your Bitcoin secure is to store your private keys offline so that no device with internet access ever has access to those keys. This is called "cold storage".
What are cold storage coins? They’re durable physical coins made from 999 fine Copper with a tamper-evident public key QR code on the back, which covers up the laser-etched private key QR code.
How do they work? You can send your Bitcoin to that public key using any wallet with QR scanning capabilities. Then, when it’s time to retrieve your Bitcoin, simply expose the private key
QR code and "sweep" the funds into a wallet application.
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