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

In a detailed discussion on Bitcoin scriptability and OP code upgradeability, the focus was placed on the differences between P2SKH (Pay to Script Hash) and P2TR (Pay to Taproot) in terms of their utility and functionality within the Bitcoin network. P2SKH is identified as serving the same purpose as P2WPKH (Pay to Witness Public Key Hash), catering primarily to straightforward, high-volume payment transactions that involve a single key without any script conditions. This specificity towards simplicity is contrasted with P2TR's capability for Tapscript or OP-code upgradeability, which is not inherent in P2SKH or P2TR key-path spending.

The conversation also addressed concerns regarding quantum security across Bitcoin's output types. It acknowledged the legitimate worry over quantum resistance but noted that this issue affects all current Bitcoin output types equally. The discourse underscored that a comprehensive solution to quantum threats would necessitate the development, peer review, and network-wide adoption of a post-quantum signature scheme, a process anticipated to span several years. Meanwhile, it was argued that maintaining the familiar 20-byte hashed address format provides an interim benefit. This approach allows the ecosystem to leverage Schnorr signatures' efficiency while awaiting a more permanent resolution to the quantum security challenge.