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They did have a third party "verify" the data, Acxiom. https://fortune.com/2023/04/11/synthetic-data-millennial-founder-charlie-javice-frank-jpmorgan-fake-cust

• noisy_boy 2y ago
  Thanks for the link: > At JPMorgan’s insistence, Javice said, she completed the task “over a couple of days and nights.” The professor uploaded Frank’s “customer list”—which now contained the synthetic data—to Acxiom on the morning of Aug. 5, the bank said. Acxiom analyzed the data and provided its report to JPMorgan later that evening. Acxiom destroyed the underlying data as its contract required, Javice said. Three days later, on Aug. 8, JPMorgan agreed to buy Frank for $175 million. Acxiom declined comment. Analyzed the data and gave report the same evening? What the hell? How on earth Acxiom is not on the hook? Is incompetence a defence? And how can they avoid going bankrupt if they choose that defence because nobody will give any work to a company that admits it? I'm now more intrigued about the Acxiom side of story.