Welcome to The Fintech Files, your weekly roundup from FN's fintech correspondent Yolanda Bobeldijk, keeping you up-to-date with the latest developments in financial tech and innovation.

"Fraud" was it, Jamie?
Last year, JPMorgan CEO Jamie Dimon made the headlines saying he would fire any staff member he caught trading bitcoin. But after softening his tone in recent months, the bank has now appointed a dedicated executive to explore cryptocurrencies and blockchain, my colleague Paul Clarke revealed last week. Today, the Fintech Files can reveal that the bank has also taken Michael Elanjian from rival Goldman Sachs to become head of digital strategies. Elanjian will take over Oliver Harris’s job of managing the bank’s fintech programme.