private String votesToString() {
    return pivotBlockVotes.entrySet().stream()
        .map(e -> e.getKey().getHash() + " (" + e.getValue().get() + ")")
        .collect(Collectors.joining(","));
  }
This task will query {@code numberOfPeersToQuery} peers for a particular block number. If any
peers disagree on the block at this number, the task fails with a {@code
ContestedPivotBlockException}. The task will succeed only if {@code numberOfPeersToQuery}
distinct peers all return matching block headers for the specified block number.
ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/sync/fastsync/PivotBlockConfirmer.java