When animals are abandoned, such as the case with these sheep, proving ownership is difficult.

We have a land registry document proving ownership of three acres.

The main purpose is in proving ownership of lost or stolen animals.

The Torrens title system is an alternative way of proving ownership.

So it has to be the email account that was used, which they need to prove continuing ownership of.

And second, I'd have no problem proving ownership.

"Then there is no solid provenance to prove ownership?"

You will be asked to prove ownership by producing a title certificate.

And anyone who can prove ownership of an item shown online gets it back free.

A related application is the hardware dongle required by some computer programs to prove ownership of the software.