In December 2025, Josh Doman developed a performance-oriented feature for the bitcoin/bitcoin repository, focusing on optimizing Taproot script verification. He introduced a PrecomputedTransactionData structure in C++ that enables transaction data to be reused across multiple inputs, reducing redundant computation during script validation. By exposing this structure through the script validity API, Josh improved throughput and decreased CPU usage for Taproot transactions. His work demonstrates depth in blockchain development, C++ programming, and cryptography, addressing a core efficiency challenge in transaction verification. The contribution reflects a targeted, kernel-level enhancement that streamlines validation processes without introducing new bugs or regressions.