Biometric account card

A method comprising:

• receiving biometric information;
• receiving payment information for receipt of payment for an amount of digital cryptocurrency;
• and
• generating a card that comprises a biometric sensor, memory, and circuitry, wherein the memory stores the biometric information, an encrypted version of a private key, and the amount of the digital cryptocurrency, and wherein the circuitry operates to authenticate sensed biometric information, decrypt the stored encrypted version of the private key responsive to authentication of the sensed biometric information, generate a digitally signed message using the private key, and transmit the digitally signed message via an interface of the card.

A card comprising:

• a biometric sensor that senses biometric information;
• memory wherein the memory stores biometric information, an encrypted version of a private key, and an amount of digital cryptocurrency;
• and
• circuitry wherein the circuitry operates to authenticate sensed biometric information, decrypt the stored encrypted version of the private key responsive to authentication of the sensed biometric information, generate a digitally signed message using the private key, and transmit the digitally signed message via an interface of the card.