What Bitcoin Is, and Why It Matters | MIT Technology Review:
The nature of the mathematics ensures that it is computationally easy to verify a transaction but practically impossible to generate fake transactions and spend bitcoins you don’t own. The existence of a public log of all transactions also provides a deterrent to money laundering, says Garzik. “You’re looking at a global public transaction register,” he says. “You can trace the history of every single Bitcoin through that log, from its creation through every transaction.”
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