Cryptocurrencies don’t spend easily, and it’s hard to tell whether their owners want to use them, rather than trade or hold. Acceptance from merchants has also been tepid. TNC IT Solutions staked out a claim to solve the spending problem as it announced an October launch for shopping app Buyaladdin at a July 16 event in New York’s Rainbow Room. The app promises to let mobile users spend their Bitcoin and other cryptos at a surprising number of big-name retailers, including eBay, Amazon and Walmart.