A huge leak of confidential documents has revealed how the rich and powerful use tax havens to hide their wealth.
In a 1,800-word statement, "John Doe" reveals he has never worked for a spy agency or a government.
He starts the statement by citing "income equality" as a motive.
The Panama Papers have shown how some wealthy people use offshore firms to evade tax and avoid sanctions.
The papers belonged to the Mossack Fonseca law firm. It denies any wrongdoing and says it is the victim of a hack.
The papers were investigated by hundreds of investigative journalists, including from the BBC, who worked in secret with the International Consortium of Investigative Journalists (ICIJ) for months.
They list more than 200,000 shell companies, foundations and trusts set up in tax havens around the world.
The John Doe statement came shortly before US President Barack Obama delivered an address on the economy, in which he cited the Panama Papers as highlighting the problem of corruption and tax evasion.
He said the US would require banks to identify those behind shell corporations. Mr Obama said his administration's actions would allow it to do a better job of making sure people paid taxes.
'Immunity'Although the name John Doe is used, the gender of the source has not been revealed.
In the statement, The Revolution will be Digitized, John Doe starts by saying: "Income equality is one of the defining issues of our time."
He adds: "Banks, financial regulators and tax authorities have failed. Decisions have been made that have spared the wealthy while focusing instead on reining in middle- and low-income citizens."
Anthony Bryan joined MI5 in the early 70s and operated in the UK, Ireland, and the Middle East, before being seconded to MI6 to work with the CIA in the USA during the War on Drugs. He now lives between homes in London, Paris and Manila and runs a successful Private Detective & Corporate Intelligence Agency, Anthony Bryan Corporate Intelligence and Investigations..