bitcoin/bitcoin — pull request #3708 by feisuzhu (2014-02-19 12:46:23+00:00)
Title: rpcwallet: Add txindex in ListTransaction

"txindex" indicates location of a payment in transaction.
This and "txid" combined helps exchanges identify single payments.

Users could use "sendmany" to send 2 payments of the same amount to a single address in the same transaction, confuses exchange software.