Proof of Jesus' divinity?
If they did, that would mean they knowingly suffered and died for a lie! No one suffers and dies for a lie! The September 11th suicide hijackers believed in what they died for, but they weren't in a position to know whether or not what they believed was true; they put their faith in traditions passed down to them over many generations. They didn't KNOWINGLY die for a lie. The New Testament's martyrs,however, either saw what they claimed to see or they didn't.
Nevertheless, these men clung to their testimonies, even to their brutal deaths at the hands of their persecutors, and despite being given every chance to recant, knowing full well whether their testimony was true of false.
Why would so many men knowingly die for a lie? They had nothing to gain for lying and obviously everything to lose.