Why the rules for valid timestamps are so strange? (The timestamp must be higher then the average of I don't know how many blocks and must be no earlier than two hours of some strange time determined by peers you are connected to, or something similar). If the rules are simply "no earlier than the previous block timestamp and no later than the local time" how would that not be enough? Computers are now (and were in the time of satoshi) synchronized pretty well via ntp. And a 1 minute or less tollerance for accepting blocks in the future will be enough to address any clock desync issues.