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Subject: Re: [bitcoin-dev] Proposal: extend bip70 with OpenAlias
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> If your email account is hacked and someone else gets a certificate in
> your name, you'd be unable to *know* about it, because they would use a
> different CA.

Maybe I am confused but I thought you are using DNSSEC to sign the zones 
so only the domain owner could issue certificates for a zone (or 
corresponding email address).  If you have "example.com" the domain 
owner of the domain would sign zone "joe.example.com" which can 
correspond to the "joe@example.com" email address.  Under this scenario 
you would only have one CA per domain.

Russ