Taproot Denial of Service Bug

TL;DR: Taproot’s sighash implementation could cause blocks to take 60s or more to validate with specially crafted standard transactions. The patch adds a new cache during validation. patch: https://github.com/bitcoin/bitcoin/pull/24105 Patched: 24.x, 23.x. Unpatched: 22.x I discovered this vulnerability while addressing feedback on BIP-119 (CTV) regarding its denial of service risk mitigations.…