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It’s currently standard for CAs to host multiple verifiers in multiple jurisdictions, to reduce the chances of this happening, afaik.

Let's Encrypt is developing this feature but it might be a little premature to call it "standard"—it's not specified in the Baseline Requirements and I'm not sure whether there's any CA that has announced it as a part of all certificate issuance.

Most CAs aren't automated :) I believe any that do ensure that DNS requests are tried from multiple different locations to prevent this happening. Though you're right, the standards haven't caught up yet.

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