Bank statements. One sort of financial record is a bank statement. Your bank will regularly send a statement containing information showing income (credits) and outgoings (debits) on your bank account.
They're synonyms. Gain is the most general. Attain usually means to reach a goal or milestone (he attained the rank of captain). Obtain usually implies careful planning or some effort to get to the thing or goal. But they have probably something like 80% overlap in meaning.
A bill of attainder is an act of a legislature declaring a person or group of persons guilty of some crime and punishing them, often without a trial. As with attainder resulting from the normal judicial process, the effect of such a bill is to nullify the targeted person's civil rights, most notably the right to own property, the right to a title of nobility, and, in at least the original usage, the right to life itself. Bills of attainder passed in Parliament by Henry Vlll on 29 January 1542 re