#25unit 2e commerce payment system
Digital cash
Electronic currency that behaves like cash.
Bitcoin mining and transfer
Powerful computers solve cryptographic problems to 'mine' Bitcoins. A user can then send Bitcoin to another user's 34-character address anonymously, without a bank as intermediary.
Bitcoin, Litecoin, and other cryptocurrencies are real-world examples of digital cash.
Linden Dollars (virtual currency)
Linden Dollars circulate only inside Second Life and are used to purchase virtual goods — illustrating how virtual currencies differ from real-world digital cash.