What did happen in the last decade: - 2017 UASF/SegWit: Eco…

What did happen in the last decade:
- 2017 UASF/SegWit: Economic nodes signaled a credible veto; miners aligned before/at activation, so there wasn’t a notable wave of invalid-block orphaning on mainnet.
- 2018 inflation bug (CVE‑2018‑17144): Critical, but not exploited on mainnet before patching.
- 2022–2023 LND/btcd parsing bugs: Affected Lightning/alt implementations, not Bitcoin Core consensus. No invalid mainnet blocks accepted.
- Routine stale/orphan blocks: Due to propagation races, not because they were invalid.