What does strict proof mean?

Answer 1

This is a term usually used in civil law cases and, basically it means this. If the Claimant says the Defendant owes him a sum of money and, the Defendant says he doesn't owe any money and, he puts the Claimant to "Strict Proof". That means the Claimant will have to prove beyond all doubt the money is owed. He will have to show all the documentation associated with the dealings between them that the money is owed and that no money has been received.