The ever‐growing number of security breaches that happen to computer networks and email servers across the world on a daily basis have occurred to systems which offer the attackers not much more than data or opportunities to score political points. Bitcoin, on the other hand, contains billions of dollars of value, but continues to operate safely and reliably because it was built, from day one, to operate in a highly adversarial setting, subject to relentless attack. Programmers and hackers worldwide have tried to tear it apart using all sorts of techniques, and yet it has continued to operate
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