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+NIP-XX
+======
+
+Delegated aggregate signature verification
+------------------------------------------
+
+`draft` `optional`
+
+Relays MAY choose to strip signatures from events. If they do so, they MUST provide a proof to clients that the relay has validated signatures for all events returned for a given REQ, using the `REQ-PROOF` verb with the request ID as the first argument, and the proof string as the second argument. This proof MUST be provided after the given `EVENT`s are sent, and applies to all previous events returned for the request since the last proof.
+
+```
+-> ["REQ", "<req-id>", <filter>]
+<- ["EVENT", "<req-id>", <event1>]
+<- ["EVENT", "<req-id>", <event2>]
+<- ["EOSE", "<req-id>"]
+<- ["REQ-PROOF", "<req-id>", "<proof>"] // This proof applies to the previous two events
+<- ["EVENT", "<req-id>", <event3>]
+<- ["REQ-PROOF", "<req-id>", "<proof>"] // This proof applies to the most recent event only
+-> ["CLOSE", "<req-id>"]
+```