The public key is very similar to the IBAN of your bank account. It is the public address of your wallet, which you can, for example, tell a debtor who would like to send you a cryptocurrency. Consequently, you do not have to keep the public key secret, but always indicate when a transaction by Cryptocoins should take place.
On our paper wallet, the public key consisting of letters and numbers is also printed as a machine-readable version in the form of a QR code.
This offers the possibility with the mobile phone and an associated digital wallet to read / import the QR code quickly and easily.