When we create a new Piwik release, right after the Piwik core packages .zip and .tar.gz have been created, the Piwik release manager signs the packages using his PGP key. This creates a cryptographic signature which gives you the possibility to check that the release package you have downloaded is the same as the one that was provided by Piwik team. Learn how to verify the signature in this blog post with instructions for Windows, Mac OS X and Linux.

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