Fee Selection for CTV-Based Mining Pool Fanouts

The development of a qbit pool, which is notably deployed using Scaling Noncustodial Mining Payouts with CTV, involves integrating post-quantum signatures and OP_CTV on a UTXO chain. This model leverages a TIDES-style share accounting system and manages payouts via direct coinbase outputs, carry-forward balances, or precommitted CTV fanouts. The primary implementation of this system is accessible at Prism Pool while the comprehensive source code can be found on GitHub.

In this setup, direct coinbase outputs are limited due to the need for compatibility with existing miner firmware, which requires keeping the coinbase size manageable. Consequently, most payouts occur through CTV fanouts where the fee structure is determined at the time of template creation, approximately 17 hours before they can be executed. The fanout mechanism avoids the need for a funded relayer, allowing anyone with the artifact to broadcast it upon maturity without requiring additional resources. Furthermore, this approach mitigates risks associated with dust transactions by ensuring each payout covers its fee and meets a minimum economic threshold.

The decision-making process for setting transaction fees in this context poses significant challenges. Currently, the fee is estimated using the node's predicted rate increased by 20%. However, the appropriateness of this method is under review, considering potential volatility in fee rates. Alternatives proposed include using a fixed premium method, averaging over several days to buffer against spikes, or simply opting for a higher fixed premium. These strategies aim to balance predictability and economic viability of mining payouts in an environment influenced heavily by the operational specifics of the qbit platform, which inherits certain policies from Bitcoin Core regarding dust transactions. This scenario underscores the unique considerations required when managing blockchain operations that integrate advanced cryptographic features and the complexities of transaction fee management in such innovative contexts.