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For dyndns it's fairly easy to replace the machine behind a domain name: either if the subscription runs out or if the IP changes and the dyndns service hasn't been updated. In that case one can trivially request a new valid certificate with letsencrypt.

I have so far used HPKP to avoid this situation. Since HPKP is now a persona non grata, which alternatives exist?

Wikipedia mentions Expect-CT but that also doesn't help in this case.

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