The efficiency problem becomes obvious when you consider a user who accesses a website site many times. For example, imagine using an anonymous credential to replace Google’s session cookies. For most users, this require obtaining and delivering thousands of single-use credentials every single day. You might mitigate this problem by using credentials only for the first registration to a website, after which you can trade your credential for a pseudonym (such as a random username or a normal session cookie) for later accesses. But the downside of this is that all of your subsequent site accesses would be linkable, which is a bit of a privacy tradeoff.
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The first race of the season is next week in Australia (March 6-8). Practice begins Friday with qualifying on Saturday and the grand prix on Sunday. Or if you live in the US, that will be Thursday night through Saturday night (race begins at 11PM ET).
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