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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: > Thanks Atul! After thinking about this more, a similar concept will be useful for PULL streams too - except expiring the stream it's for expiring the events themselves, so that the Tx doesn't have to keep them for too long. (more an optimization

 instead of a security use-case) FYI SSF spec discourages [exp claim](https://openid.net/specs/openid-sharedsignals-framework-1_0.html#name-the-exp-claim)

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