$WIF WIF (Wallet Import Format) is a standard key format for a Bitcoin wallet. This format is used to export and import private keys in various Bitcoin clients.

Features of the WIF format:

1. It is a 51-character string that begins with one (1) and then contains letters and numbers.

2. Allows you to save and transfer private keys between different clients without losing information.

3. Provides an additional level of security due to the use of the Base58Check hashing method.

4. Convenient for use in the command line, as it allows you to quickly generate and import keys.

Thus, WIF is a convenient and secure way to store and transfer private keys in the Bitcoin ecosystem.