allow max drift to 12m
allow max drift to 12m

syscoin's blocks are 10x faster so absolute amount of blocks to work is 10x less, to account for it a miner cannot mine ahead as much as bitcoin as there would be less equivalent work. IE: 10 blocks of bitcoin is equivalent to work of 100 blocks in syscoin, thus reduce max drift by 10 times to account for this especially in light client verification schemes

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