Helps work around defects in the bitcoin protocol by checking whether the returned hashes actually extend a chain tip.
Controls how many times we will retry each block download.
Controls how long we wait for a block download request to complete.
Controls the number of peers used for each ObtainTips and ExtendTips request.
A lower bound on the user-specified lookahead limit, set to two checkpoint intervals so that we're sure that the lookahead limit always contains at least one complete checkpoint interval.
Controls how long we wait to restart syncing after finishing a sync run.
Controls how long we wait for a tips response to return.