Millions of internal records have leaked from Britain's offshore financial industry, exposing for the first time the identities of thousands of holders of anonymous wealth from around the world, from presidents to plutocrats, the daughter of a notorious dictator and a British millionaire accused of concealing assets from his ex-wife.

The leak of 2m emails and other documents, mainly from the offshore haven of the British Virgin Islands (BVI), has the potential to cause a seismic shock worldwide to the booming offshore trade, with a former chief economist at McKinsey estimating that wealthy individuals may have as much as $32tn (£21tn) stashed in overseas havens.

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The names have been unearthed in a novel project by the Washington-based International Consortium of Investigative Journalists [ICIJ], in collaboration with the Guardian and other international media, who are jointly publishing their research results this week.

The naming project may be extremely damaging for confidence among the world's wealthiest people, no longer certain that the size of their fortunes remains hidden from governments and from their neighbours.

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As well as Britons hiding wealth offshore, an extraordinary array of government officials and rich families across the world are identified, from Canada, the US, India, Pakistan, Indonesia, Iran, China, Thailand and former communist states.
The data seen by the Guardian shows that their secret companies are based mainly in the British Virgin Islands.

Sample offshore owners named in the leaked files include:

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• US: Offshore clients include Denise Rich, ex-wife of notorious oil trader Marc Rich, who was controversially pardoned by President Clinton on tax evasion charges. She put $144m into the Dry Trust, set up in the Cook Islands.

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The whistleblowing group WikiLeaks caused a storm of controversy in 2010 when it was able to download almost two gigabytes of leaked US military and diplomatic files.

The new BVI data, by contrast, contains more than 200 gigabytes, covering more than a decade of financial information about the global transactions of BVI private incorporation agencies. It also includes data on their offshoots in Singapore, Hong Kong and the Cook Islands in the Pacific.