The BIP38 open-source standard makes this possible using an advanced cryptography technique called double-blind encryption. BIP38 allows a private key entropy to be created without knowledge of the passphrase entropy required to decrypt it, and it provides a confirmation code that can be used to verify that a passphrase entropy can decrypt its corresponding private key entropy without actually trying to decrypt it. Ballet’s innovative two-factor key generation process takes advantage of this advanced cryptography to produce a highly secure cryptocurrency cold storage card. For more information on Ballet’s patented 2FKG manufacturing process, please visit: https://www.balletcrypto.com/2FKG