Aligning privacy incentives in P2MR

The recent discussions in the Bitcoin Development Mailing List have brought up proposals for enhancing the efficiency of transactions by modifying the witness discount policies. A key suggestion put forth involves increasing the witness discount for transactions using EC Schnorr within the P2MR (Segwit v2) framework. This potential adjustment would effectively double the current witness discount, resulting in an overall eightfold reduction for these specific transaction types. Such a change would align the costs of P2MR EC-spend transactions closely with those of the P2TRv2 key-spend path, potentially easing financial barriers and encouraging wider adoption of newer technologies.

Another aspect of the ongoing debate focuses on the integration of post-quantum (PQ) signatures into the Bitcoin network. There is a consideration to provide additional discounts for transactions that utilize EC Schnorr leaves, particularly if the higher costs associated with larger transactions are hindering migration to more secure cryptographic methods. These discussions underscore a critical need for a balanced approach in policy updates to support both technological advancement and economic feasibility for users across the Bitcoin network.