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openid/sharedsignals event <br>
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Issue Comment created on issue 211 <br>
Issue Title: Permanence of streams <br>
https://github.com/openid/sharedsignals/issues/211 <br>
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Comment: +1 on Yair's comments. It can be expensive for a transmitter to continue to transmit indefinitely to defunct receivers. It is potentially insecure to allow streams to exist indefinitely. An optional "time remaining" or "expiration timedate" property
on a Stream Configuration communicates a finite lifecycle to the Receiver. The property could be updated by the Transmitter after successful verification event, or via PATCH request from receiver.
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