Multiple microprocessor architecture for cold storage

A system comprising:

• a mobile device connected to a network, wherein the network includes access to a blockchain corresponding to a digital currency;
• and
• a hardware wallet comprising
• a first microprocessor;
• a first non-transitory memory containing instructions, that when executed by the first microprocessor, causes the first microprocessor to perform operations comprising:
• establishing a secure wireless connection with the mobile device,
• communicating transaction data for the blockchain via the secure wireless connection with the mobile device;
• a second microprocessor;
• and
• a second non-transitory memory containing instructions, that when executed by the second microprocessor, causes the second microprocessor to perform operations comprising:
• generating a private key and a public key;
• encrypting transaction data using a hash function and the private key;
• producing a digital signature independent from the first microprocessor;
• transmitting the produced digital signature and the generated public key to the first microprocessor;
• encrypting the private key;
• and
• storing the encrypted private key securely within a storage unit such that the private key is readable only by the second microprocessor.

A method comprising:

• establishing, by a first microprocessor from a hardware wallet, a secure wireless connection with a mobile device, wherein the mobile device is connected to a network having access to a blockchain corresponding to a digital currency;
• generating, by a second microprocessor from the hardware wallet, a private key and a public key;
• encrypting transaction data using a hash function and the private key;
• producing a digital signature independent from the first microprocessor;
• transmitting the produced digital signature and the generated public key to the first microprocessor;
• storing the encrypted private key securely within a storage unit such that the private key is readable only by the second microprocessor;
• and
• communicating, by the first microprocessor, the transaction data, the digital signature, and the public key to the blockchain corresponding to the digital currency.