what is result in  "txs" field?
i was thinking that it is amount, but then I got confused: even you submit a list of addresses, blockchain gives you info grouped by tx, so if you happen to have two of your addresses in one tx, the result doesn't make sense.
It will correspond to one of the submitted addresses, right?
quite complicated...
as opposed to that blockr would not group info by tx but rather by addresses
example: http://btc.blockr.io/api/v1/address/txs/184vxW7JgzbixCN2ZGvyKLxvEXDevT6gaj,15ByNz4AR2uPEJGDrBAgSQgnrx54mReK11
common tx 7b2228e40906096eefb91724452c7209ffc2b939f941a3311ac940466f1de4b3 appears twice in the output