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openid/sharedsignals event <br>
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Issue Comment created on issue 257 <br>
Issue Title: Preventing replay attacks in PUSH streams <br>
https://github.com/openid/sharedsignals/issues/257 <br>
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Comment: Also, when setting up push delivery, the receiver can set the `authorization_header` that the transmitter must include in every push. https://openid.github.io/sharedsignals/openid-sharedsignals-framework-1_0.html#name-push-delivery-using-http
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