At first, I also suspect that case-sensitivity is the cause, but when I check "1
abc", both FirstBits.com and blockchain.info return 1
AbcTuRqKkr7RsPMKchdSd2kV6dd1THWru, this implies that FirstBits.com is NOT case-sensitive.
Any other ideas?
Case sensitive comes to mind, but not sure is that's the cause.
~Bruno~
EDIT: 21 seconds to late.