> vast amount of effort that went into the Signal protocol If it requires protocol development, I'd agree. I expect - knowing no more than Signal's blog posts

> vast amount of effort that went into the Signal protocol If it requires protocol development, I'd agree. I expect - knowing no more than Signal's blog posts - that it has two components: * Local database: These records need a retention period column, somehow - however they implement it with text messages. That seems straightforward. * 'Distributed retention' - implementing the retention period setting on the remote devices of other call participants. I expect they would do it the same way they do with text messages, and I would guess it's just a field in a packet somewhere; e.g., establish a secure connection and then in the call's initial packet, time = 2025-05-21T22:13:11Z call.from = lblume call.to = mmooss retention.period = 1440 minutes