Reading this thread and the GitHub issue that spawned it, it is clear that even 
the co-authors of draft-ietf-dnsop-domain-verification-techniques do not agree 
on how to handle persistence of validation, much less agreement among WG 
participants. This may be due to lack of real-world experience with persistent 
validation, even though we have plenty of experience with single shared secret 
validation for one instant.

draft-sheth-identifiers-dns is a good start at thinking about the differences 
between persistent validation and single shared secret validation. It seems 
safe to limit draft-ietf-dnsop-domain-verification-techniques to just the 
latter, and hopefully the WG adopts draft-sheth-identifiers-dns and has more 
discussion about what might become best practices there.

I'm posting here because just last week I thought that 
draft-sheth-identifiers-dns should be part of 
draft-ietf-dnsop-domain-verification-techniques because there was general 
agreement on what were best practices. I was wrong, and the more that I thought 
about what I would say were best practices for persistence validation, the more 
I realize that I hadn't thought enough about the operational and security 
considerations.

Given that, I propose that draft-ietf-dnsop-domain-verification-techniques be 
narrowed to only cover the best current practices for shared secret validation, 
and get that published sooner rather than later. I further propose that 
draft-sheth-identifiers-dns be adopted by the WG, on the assumption that it 
starts with the same naming scheme from 
draft-ietf-dnsop-domain-verification-techniques.

--Paul Hoffman

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