Banks were unwilling to lend money to people without credit histories or proof of permanent residence.

ECONOMIST: India's cheap housing boom

Be sure to have your receipt or credit-card information as proof of purchase.

WSJ: Dollars for HD Losers

Ms. Coultman lost on the child care credit because she had no proof of her expenditures not even remembering how much they were.

FORBES: Brooklyn Grandmother Wins On Dependency Exemption

Taxpayers taking the credit will also have to furnish proof of purchase.

WSJ: Home Buyer's Tax Credits -- What You Need to Know

We were credit-checked and had to provide proof of income for ourselves.

BBC: 'Steep rise' in tenant evictions

It was a miserable scorecard in what is supposed to be a recession-proof industry that escaped the credit and liquidity problems plaguing other financial institutions.

FORBES

One proof of this companys marketing savvy is this credit card that was given to yours truly.

FORBES: Fact and Comment

For instance, the IRS currently can't deny a tax credit for adopting a child to someone who has not provided adequate proof of the adoption, according to Russell George, Treasury Inspector General for Tax Administration.

WSJ: Lawmakers Consider Expanding IRS Power to Flag Errors Before Audits

The CARD Act also requires that students under age 21 show proof of sufficient income or get a co-signer to obtain credit.

WSJ: Cards Return to Campus

The strong credit-rating implied by its low interest rate, claims the Malaysian government, is proof of what it has been saying all along: ill-informed westerners have got things wrong.

ECONOMIST: Asian sovereign borrowing