Proof of funds refers to a document that demonstrates the ability of a person or entity to pay for a particular transaction.
A bank statement, certificate of security or certificate of custody is usually considered proof of funds.
Proof of funds is usually required for a major transaction such as buying a house.
Basic information such as the name and address of the bank, bank statement, total balance, signature of the bank officer is required in the proof of funds.
When applying for a mortgage loan, both proof of funds and proof of deposit are often required.