2016-08-14 UTC
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cmal so this is where public-key cryptography can come in handy: when sending a webmention to someone who doesn't trust you yet, you could sign with your key a vouch request to a mutual friend and attach it to the webmention, then the receiver of the webmention could query the mutual friend with the signed vouching request, and if it matches your key and a request to your h-card url, then it would return a valid vouch