Sift knew, for example, that I’d used my iPhone to order chicken tikka masala, vegetable samosas and garlic naan on a Saturday night in April 3 years ago. It knew I used my Apple laptop to sign into Coinbase in January 2017 to change my password. Sift knew about a nightmare Thanksgiving I had in California’s wine country, as captured in my messages to the Airbnb host of a rental called “Cloud 9.”

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