Anchor the header to a trusted view of the chain (checkpoints, multi-source
tip cross-check, header sync...). Throw to reject. When omitted the caller
accepts embedded-PoW-only anchoring (NOT recommended for adversarial
settings: a single header's work is cheap relative to valuable content).
Anchor the header to a trusted view of the chain (checkpoints, multi-source tip cross-check, header sync...). Throw to reject. When omitted the caller accepts embedded-PoW-only anchoring (NOT recommended for adversarial settings: a single header's work is cheap relative to valuable content).