why time of block 77128 early than time of block 77127?
Block Height: 77127 Block Time: July 22, 2013, 07:29:38
Block Height: 77128 Block Time: July 22, 2013, 07:24:46 <---------------
Block Height: 77129 Block Time: July 22, 2013, 07:30:55
http://primecoin.21stcenturymoneytalk.orgThis is normal. The block timestamp is written by miners, and miner nodes may have inaccurate clock. Bitcoin protocol allows a timestamp up to 2 hours in the future of the local clock when accepting blocks, and it also must be greater than the median of past 11 blocks. The constant 2 hours and the median of 11 previous blocks were chosen so that bitcoin network would not be too dependent on ntp or in general problems in the software clocks.
In primecoin these constants are set at 2 hours and median of 99 previous blocks.