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So how will Denmark s Covid-19 passport work? At least four ready-made solutions exist based broadly on two types of technology. One relies on remote cloud servers where information is stored in bulk. The other uses blockchain, a more complicated system that could be better at protecting privacy. Since personal medical data is so sensitive, it s a tricky decision. That s why many European nations covered by stringent EU privacy laws appear desperate for someone else to go first. Digital toolbox Ida Marie Odgaard/Ritzau Scanpix/AFP/Getty Images The high level of investment in developing Covid passport systems indicates high private sector optimism that they will become a common way to open borders. ....