[Roger Ver] attempted to use a QR code containing a private key to give away some cryptocurrency on TV, but the code was blurred out by the broadcaster. Not ones to give up easily, [Michael] and ...

Instead of storing hard currency, Bitcoin wallets store the private keys ... including via QR code scans. Paper wallets are cold storage wallets that are created using a key generator program ...

Losing a private key means losing access to Bitcoin permanently because there is no recovery system. For long-term storage, offline wallets like hardware devices or ...