Properties:
1. Monetary Value: Monetary value must be backed by either cash, bank - authorized credit cards or bank certified cashier's cheque.
2. Interoperability: E-cash must be interoperable i.e. exchangeable for other e-cash, paper cash, goods or services etc.
3. Retrievability : E-cash must be storable and retrievable.
4. Security : E-cash should not be simple to copy or tamper.