update checkpoints at 44750
update checkpoints at 44750

coinkeeper/2015-04-19_21-08_bitmark,coinkeeper/2015-04-19_21-08_bitmark,coinkeeper/2015-04-19_21-08_bitmark,coinkeeper/2015-04-19_21-08_bitmark,coinkeeper/2015-04-19_21-08_bitmark