Internet Party leader Laila Harre says she has no doubt Kim Dotcom is telling the truth about an email purporting to show John Key was involved in a plan to get him extradited to the US.

Last night Dotcom showed up empty handed to the Moment of Truth event he had organised, after claiming for three years he could prove John Key had lied in relation to his copyright case.

Renegade former US intelligence analyst Edward Snowden claimed his former employer spy agency National Security Agency has a facility in Auckland. Snowden, who is sheltering in Moscow from US attempts to extradite him on espionage charges, appeared by video link before a capacity crowd at the Kim Dotcom organised Moment of Truth event at Auckland Town Hall. Footage The Moment of Truth/YouTube

And when asked about the failure to produce his promised evidence, the tycoon turned angry and told the media they were failing at their jobs.

The Moment of Truth was the event at which Dotcom claimed he would "absolutely" prove the Prime Minister knew the tycoon was in the country before 2012. The issue is a key factor in Dotcom's theory that Mr Key, US President Barack Obama and Hollywood were in a conspiracy to have him extradited.

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The email, dated October 27, 2010, purports to be from Warner Brothers chairman and chief executive Kevin Tsujihara to a senior executive at the Motion Picture Association of America - the lobby group for the Hollywood studios.

The Kim Dotcom "big reveal" is out - and has almost immediately been dismissed as a fake. The "reveal" is an email which purports to show Prime Minister John Key involved in a plan to get the internet entrepreneur into New Zealand so he could be extradited to the United States. Mr Key said this afternoon he had absolutely no recollection or record of any such conversation. "I do not believe that to be correct. I have no recollection of the conversation alluded to in that email, there are no records there and the meetings I had were with other people around me. So in the end we'll try go and get to the bottom of it, but we don't have any record of it."

However, Warner Bros told the Herald yesterday the email was a fake. Paul McGuire, the movie studio's senior vice president for worldwide communications, told the Herald: "Kevin Tsujihara did not write or send the alleged email, and he never had any such conversation with Prime Minister Key."

The evening saw the audience transfixed by a series of disclosures from journalist Glenn Greenwald, his source Edward Snowden and WikiLeaks founder Julian Assange.

But the international guests could not paper over the absence of Dotcom's promised evidence.

Prime Minister John Key has challenged Edward Snowden and Glenn Greenwald to front up with evidence of their claims of mass surveillance and NSA bases in New Zealand. Mr Key responded this morning to Snowden's claims that New Zealanders' metadata was included in the XKeyscore data harvesting programme used by the US and that there were two NSA bases in New Zealand. Mr Key said neither had provided any actual evidence of their claims and said it was simply rhetoric.

Towards the end, there was a passing reference by Dotcom's international lawyer Robert Amsterdam to an email which purported to prove the conspiracy.

Ms Harre told TV3's Firstline programme this morning the email "provides very clear evidence that the Prime Minister did know about the existence of Kim Dotcom and more than that, that he was involved very intimately with the process of this case."

"I have no doubt that Kim is absolutely truthful about that email.

"There needs to be a proper process now to investigate that."

Asked why Dotcom declined to comment on the email last night, Ms Harre said he'd received legal advice not to do so.

"The strong advice to him was to make sure that this evidence was put before a proper judicial process. That is what Parliament's privileges committee is.

"He followed the advice, rather than his gut instinct to share everything yesterday.

Labour leader David Cunliffe wants the last TV election debate extended so he and John Key can debate the spying accusations from Kim Dotcom. Cunliffe would investigate the entire process if he was Prime Minister on monday. He also wants to win all seven Maori seats, even if that means a loss for Mana.

In a press conference after last night's event, Dotcom stood by the email. "I believe it to be 100 per cent true."

Told it had been labelled fake, he asked: "What alternative do they have? The Government lies all the time."

But it didn't stop more questions from journalists, leaving Dotcom trying to point the media to the issue of mass surveillance.

"[The public] don't care about my case tonight. They care about being subjected to this evil mass surveillance."

Finally, he appeared to lose his cool and angrily lectured the media: "You have an obligation after what you have learned tonight to take the information you have learned from Glenn Greenwald.

"You have failed New Zealanders in the past -- look at Dirty Politics," he said, referring to the book about the alleged National Party attack politics campaign. "You need to wake up and do your jobs.

"My case only affects me. It doesn't matter tonight. That's why we didn't make a big deal out of it. You need to get your priorities right. We have focused on the much bigger lie, which is every single New Zealander subjected to mass surveillance."