This is part of “,” a series looking at the impact of blockchain, bitcoin and cryptocurrency on our lives.
Alexander Busarov used to buy a popular brand of pet food for Gulchatai, his Siamese cat, from Taobao, China’s sprawling eBay-like auction site. That changed when the kitty landed at the vet’s after eating from a shipment that looked strikingly different from store-bought tins.
Gulchatai eventually recovered — she had acute gastroenteritis — but the episode worried Shanghai-based Busarov. How could he ever know, he wondered, if what he was buying online was real?
So in April 2015, Busarov,…