Bitcoins, Ether, Monero - cryptocurrencies can be loaded onto your smartphone in exchange for hard currency - and then used to buy almost anything online. What are the advantages and disadvantages of virtual currencies? An explanation.
In January, one Bitcoin cost about $700 (€589). Now it's reached $11,000. We look at what Bitcoin is, why it's inflating, and whether it's likely to become a common way for people to pay for stuff.
If you were a wannabe hacker, here's how you'd use bitcoin to hold internet users to ransom. But be warned: You'd probably get caught - especially if you made mistakes like the WannaCry hackers.
The darknet is a playground for illegal activities: weapons and drug trade, child pornography and fraud. It also offers a safe space for activists living under repressive governments. How does the darknet work?
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