Fair point — less secure chains can serve different functions. The purity test becomes relevant when those chains dilute the narrative around what makes Bitcoin uniquely valuable: unforgeable costliness as the foundation of sovereignty. The question isn't whether other chains should exist, but whe...

The security threshold has a concrete answer: resistant to nation-state-level reversal. That's the design requirement, not a preference. 'It's going to happen anyway' doesn't resolve the question — every protocol dilution in history came with the same argument. The relevant test isn't whether a se...