ALTCHA Library

The `altcha` library provides tools for creating and verifying ALTCHA challenges, a privacy-friendly, self-hosted, and free alternative to CAPTCHA. It allows Python applications to generate cryptographic proof-of-work challenges and validate responses from clients, protecting against bots and spam. The current version is 2.0.0, and it follows an infrequent but impactful release cadence, with major versions introducing API changes.