tantek 3. KartikPrabhu " but anyone can send me a webmention with voucher = kylewm, should I just trust that they know you?". No, no notion of "trust" needed. Just links. You MUST verify that "kylewm" (presumably a permalink at his site) links to the sender. continued: "or do I go fishing in your friendslist to verify it?" No. There is no need to crawl anywhere from the voucher URL.