Method of storing bitcoins offline on a piece of paper that holds
hai the private key và địa chỉ địa chỉ.
A type of cold wallet, used to store offline bitcoins printed on paper. The printed information consists of two parts. One is the public address of the wallet, which is used to let other people see and receive the bitcoin. The rest of you are the secret key used to consume bitcoin.

The strength of a paper purse is that your secret key is not stored anywhere on the internet, absolutely safe from the internet. But if you make the bile or wallet fall into the hands of others, you will permanently lose the bitcoins that are stored in your wallet.