Re: [BIP Proposal] Mempool Validation and Relay Policies via User-Defined Scripts]

The discussion revolves around the topic of transaction fees and mempool management in the Bitcoin network, highlighting the inefficiency of the current default mempool minfree rate of 1 satoshi per byte. Observations indicate that despite this rate, blocks are being filled with transactions that cost below this threshold, demonstrating a clear bypass of default mempool filters. The monetary advantage gained from executing transactions at sub-1sat/vbyte outweighs the cost incurred to circumvent these filters, which is estimated to be less than 0.3 satoshi per byte. This situation suggests an initial investment made to bypass the filters, which over time becomes more cost-effective.

There's an open endorsement for reducing the default minimum free rate, with a suggestion to possibly eliminate it entirely, relying instead on the maximum size of the mempool to manage transactions. This approach could streamline the process, making it more efficient. Additionally, there's an acknowledgment of the importance of filtering mechanisms within the Bitcoin network, especially concerning their role in blocking third-party malleable transactions or their non-standard forms. These types of transactions pose a significant risk as they may never be included in blocks, underlining the necessity for effective filtering to maintain network integrity and functionality.