New York — A failed Swiss entrepreneur revealed to a New York jury the secret methods he used to earn $70m in illegal profit from a global insider-trading network — including a safe full of cash to pay off corrupt tipsters and phony invoices for artwork sales to mask some payments.

Marc Demane Debih, testifying for US prosecutors in an insider-trading case against a New York man, described how he stole information from a banker girlfriend, planted stories with journalists and disguised illegal trades by using other people to make share purchases...

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