PQC - What is our Goal, Even?

The ongoing discussion on the Bitcoin Development Mailing List highlights significant concerns regarding address reuse in the context of Bitcoin's P2MR specifications as outlined in BIP360. Over five years have passed since the activation of Taproot, a development that promised several enhancements including making outputs indistinguishable between Script and non-Script paths, concealing the presence of a Script path when a keypath is used, and encouraging the correct use of keypaths. These advancements are at risk if the current proposals concerning CRQC (Collision Resistant Quantum Computing) mitigation proceed without considering alternative solutions.

Furthermore, Matt Corallo emphasizes the importance of maximizing the number of users and unspent transaction outputs (UTxos) that can be securely transitioned to newer standards, rather than focusing solely on the share of supply. This perspective is supported by data from the Milton-Shikhelman report published in July 2025, which estimated over 60% of existing UTxOs reuse an address. This statistic underscores the widespread prevalence of address reuse and highlights the critical need for strategies that do not compromise the foundational benefits introduced by Taproot.