I think perhaps we need to take a step back and explain something that might not be well-known outside the community of CDN’s and their customers. It is not uncommon for (admittedly larger) origins to use multiple CDN’s, and to switch among them. This can be done on a per-request basis, because of things like contractual arrangements that make one preferable, or it can be done globally but switched in a matter of seconds because of a short TTL on the www.example.com<http://www.example.com> entry.
The issues that Mike discusses impact on this, somewhat negatively. A quick hack thought is to allow multiple entries in the TXT record, forcing a wee bit more work on the CDN.
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