PARIS: When Matt Danzico began seeing cryptocurrency logos in the packaging of grocery store items, he knew he had a problem. Danzico had been swept up in the global craze for trading digital currencies during the pandemic, and very quickly it had grown into an obsession. “I would have these sleepless nights where I’d be tossing and turning, trying to get these charts out of my head,” said the Barcelona-based designer and visual journalist. “I thought I was losing my mind.” Cryptocurrencies like bitcoin and ethereum are notorious for their volatility, and the 39-year-old saw “years worth of mo…

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