[BIP proposal] Pay to Schnorr Key Hash (P2SKH)

In a recent exchange on the Bitcoin Development Mailing List, there was a discussion highlighting some of the potential drawbacks associated with certain cryptographic optimizations. The conversation pointed out that by removing features such as scriptability and OP-code upgradeability to save on data space—specifically, 12 bytes—a system might inadvertently confine itself to a cryptographic path that is not quantum secure. This limitation applies unless the keys involved are never actually used for transactions, which raises concerns about the practicality and future-proofing of these optimizations in the face of advancing quantum computing capabilities.

The critique underscores the importance of balancing efficiency with security, especially in the context of developing technologies that are resistant to quantum computing threats. The mention of locking into a "non-quantum-secure key spend path" serves as a reminder of the need for forward-thinking in cryptographic design, to ensure both the integrity and longevity of digital assets in an evolving technological landscape. This dialogue reflects the ongoing debate within the community about how best to optimize blockchain technology while maintaining robust security measures against emerging computational threats.