libbitcoinkernel is an experimental, stateful C++ library project within Bitcoin Core aimed at extracting and modularizing the consensus engine—the core logic that validates blocks and transactions. Unlike the deprecated libbitcoinconsensus, which was stateless and limited to script validation, libbitcoinkernel is designed to manage state, support caching (e.g., for script and signature verification), spawn threads, perform I/O, and eventually manage dynamic components like the mempool.