Blocks above the newest checkpoint cannot be anchored, so the header from
the primary server is now compared with the one from a second server taken
from the hardcoded bootstrap list. A disagreement at 3+ blocks of depth
aborts the sync; a shallower one leaves the proof unverified until the next
sync; with no reachable witness behaviour is unchanged. A bounded
proof-of-work check was evaluated and rejected. See ADR 0042.
davide
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