[kitteh]

There can be legitimate use cases why a network maybe have a very few amount of prefixes not signed or even invalid: canaries and beacons.

For example, running tests to a signed, unsigned and invalid prefix can provide insight into how other networks are routing to them.

One example is a beacon to probe to determine if a network has enabled origin validation. Failure to connect, or a change in the routing path can provide insight into which networks on the internet have enabled origin validation.