How it might work
It depends on public-key cryptography and digital signatures
Banks and customers have public-key encryption keys
They use their keys to encrypt (for security) and sign (for identification) blocks of digital data that represent money orders
A bank ÅgsignsÅh money orders using its private key
Customers and merchants verify signed money orders with the bank's widely published public key
Customers sign deposits and withdraws using their private key and the bank uses the customer's public key to verify the signed withdraws and deposits
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