Since its creation more than 12 years ago, Bitcoin is undefeated. Its price has leaped from $5 to $50 to $500 to $5,000 to now past $50,000. The number of global users has eclipsed 100 million. The system’s network security, number of developers, and new applications are at all-time highs. Dozens of companies including Tesla and Square have started to add Bitcoin to their corporate treasuries. This worldwide success doesn’t mean that people haven’t tried to stop Bitcoin. The digital money project has in fact survived a variety of attacks which in some cases threatened its existence. There are two...