Hacker News on 22 June 2021

• A from-scratch tour of Bitcoin in Python
• Brave Search beta
• Your CPU may have slowed down on Wednesday
• What's Inside the EU Green Pass QR Code?
• Ask HN: Feeling guilty for doing the bare minimum at work
• The Most Dangerous Censorship
• Hyundai acquires controlling stake in Boston Dynamics for $880M
• What is ranked-choice voting and why is New York using it?
• Show HN: I made a new kind of Bible app
• Tour of the server room in the Airbus 350