Method and system for offline data transfer via machine-readable code

A system for offline transmission of blockchain details, comprising:

• a memory of a computing device storing at least a first private key of a first cryptographic key pair, a currency amount, and program code;
• and
• a processor of the computing device executing the program code stored in the memory of the computing device, the program code causing the computing device to:
• receive, by a receiving device of the computing device, at least a first destination address associated with a blockchain network and a transaction amount;
• generate, by a generation module of the computing device,
• a second destination address associated with the blockchain network based on a second cryptographic key pair;
• and
• a blockchain transaction including at least the first destination address, the transaction amount, the second destination address, and a remainder amount based on at least a difference of the currency amount and the transaction amount;
• store, in the memory of the computing device, a second private key of the second cryptographic key pair in place of the first private key, which is deleted from the computing device;
• transmit, by a transmitting device of the computing device, the generated blockchain transaction.