The evidence of their own pages will prove their authenticity.

If this young person should produce her letters for blackmailing or other purposes, how is she to prove their authenticity?

He did not have to spell out what everyone now realized: the fact that their source had been executed proved her authenticity.

To further prove his authenticity, Eminem is really the only subject of his art.

Let's just say there's a reason this guy wants to pay a million dollars to prove their authenticity.

Any party intending to adduce a private document in evidence should be prepared to prove its authenticity.

But she did not complain, since she had profited by the need to prove her authenticity every step of the way.

The ball, which was marked with a serial number to prove its authenticity, bounced all the way back to center field.

I must come up with something that proves my authenticity, no?

It was certified by a notary; there would be no trouble proving its authenticity.