Kim Dotcom is offering a $5m (£3m) "bounty" to whistleblowers for information to help fight an online piracy case brought by the US.

The Megaupload founder, who is resisting extradition from New Zealand, said he had to resort to offering the money because the deck was stacked against him in one of the largest copyright infringement cases ever brought.

"My case is unfair," the German national tweeted. "I was declined discovery, I didn't get my own data back, I need whistleblowers I am offering USD $5M."

Dotcom, whose Megaupload empire was shut down in January 2012, has long argued that US authorities, aided by close ally New Zealand, illegally targeted him at the behest of Hollywood studios.

He told technology news website TorrentFreak.com that the multimillion dollar offer was aimed at helping him prove that allegation.

"We are asking for information that proves unlawful or corrupt conduct by the US government, the New Zealand government, spy agencies, law enforcement and Hollywood," he said.