A more thorough explanation:

Common assurance refers to documentary evidence of ownership of a property, such as a deed or a judgment. It is also known as muniment of title.

For example, if a person wants to prove their ownership of a property, they can provide a deed as common assurance. This document serves as evidence of their legal right to the property.

Another example is a judgment that confirms ownership of a property. This judgment can also serve as common assurance and can be used to prove ownership.

Overall, common assurance is important in establishing ownership of a property and providing legal evidence of ownership.