Blockchains are going private. The only question left is what kind of privacy the industry will build, argues Schiller. Blockchains were built as public networks in the best tradition of open-source technology. But their future is private. And that future is arriving faster than most people realize. This month, Tempo — the Stripe-backed payment blockchain that raised $500 million at a $5 billion valuation , with Visa, Mastercard, Paradigm, and UBS among its backers — published a detailed archit…
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