As Kim Dotcom gets ready for his wedding today, the entrepreneur's lawyers are apparently serving "a multi-billion dollar damages claim" against the New Zealand Government.

On the sixth anniversary of the raid on the Coatesville mansion where he lived, Dotcom took to Twitter to castigate the Government.

"Today, 6 years ago, the NZ Govt enabled the unlawful destruction of Megaupload and seizure of my global assets. I was arrested for the alleged online piracy of my users. Not even a crime in NZ. My lawyers have served a multi-billion dollar damages claim against the Govt today," he tweeted.

Dotcom, however, says by getting married on the anniversary of the raid, he is turning January 20 into a "day of joy".

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Dotcom's and fiancee Elizabeth Donnelly's wedding was originally planned for November but he has marked most anniversaries of the raid with a special event.

On its first anniversary, he launched the Mega business, for instance.

In the 2012 raid Dotcom and three others were arrested in New Zealand on behalf of the FBI, which was carrying out a worldwide operation targeting his file-sharing business Megaupload, at the time consuming 4 per cent of the globe's internet traffic.

Even though Dotcom was facing claims of criminal copyright violation - later found to not be a crime here - the police used the anti-terrorist Special Tactics Group in a helicopter assault on the Coatesville mansion.

He and others arrested face decades in jail if successfully extradited to the United States and convicted on copyright, money laundering and other charges.

Dotcom has always denied any illegality.

Dotcom's American-based lawyer Ira Rothken confirmed the damages claim in a tweet this afternoon saying: "We confirm that our legal team filed a Statement of Claim for monetary damages on December 22, 2017 on behalf of @KimDotcom against the United States and NZ governmental entities alleging that defendants pursued with malice and material non disclosure an erroneous arrest warrant".

Rothken told the Herald the complaint was against both New Zealand and US governments for "pursuing and maintaining and erroneous arrest warrant and making material non-disclosures to the court about it".

The complaint alleges the New Zealand court that granted an arrest warrant for Dotcom was misled when important information was omitted, Rothken said.

"We're alleging amongst other things that the Government knew or should have known that the copyright allegations did not support a crime in New Zealand, and did not support the arrest warrant.

"Even when they were reminded of that they still maintained the erroneous arrest warrant and so we're alleging that the Government acted with malice."

He said the complaint alleges millions of dollars in damages.

Rothken said he was confident Dotcom had a strong case.

"Not only are the criminal claims erroneous but we also believe the procedures that were followed by the Government, in the end demonstrate Government abuse in a case that is highly political, and for Kim Dotcom not to prevail here politics would have to get involved somewhere."

Rothken earlier would not say where Dotcom was getting married today other than to confirm it was somewhere in New Zealand.

"Out of a very stressful and turbulent time for him, with all that's going on in the legal front in New Zealand, we want to have extra caution in giving him and his new wife their privacy on this very important day."

A spokeswoman for the Minister on duty, Stuart Nash, who is also the Minister of Police, and for the Attorney-General David Parker, said they had no comment.