davide
9010ebce59
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.