In order for the Bitcoin system to work, people can make their computer process transactions for everybody.

The computers are made to work out incredibly difficult sums. Occasionally they are rewarded with a Bitcoin for the owner to keep.

People set up powerful computers just to try and get Bitcoins. This is called mining.

But the sums are becoming more and more difficult to stop too many Bitcoins being generated.

If you started mining now it could be years before you got a single Bitcoin.

You could end up spending more money on electricity for your computer than the Bitcoin would be worth.
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