There are two varieties of each type of e-money
Online emoney requires interaction with a bank via modem or network to conduct a transaction with a third party
Offline emoney means you can conduct a transaction without having to directly involve a bank
This type of e-money (true digital cash) is the most complex form of e-money because of the double- spending problem
Once I give it to you, I should not be able to spend it again
How can we prevent this?
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