On Tue, Jan 10, 2023 at 8:22 AM Nick Mathewson <ni...@torproject.org> wrote:
> ``` > Filename: 342-decouple-hs-interval.md > Title: Decoupling hs_interval and SRV lifetime > Author: Nick Mathewson > Created: 9 January 2023 > Status: Draft > ``` > > # Motivation and introduction > > I think there's another issue to address here too: the offset from the Unix Epoch at which the first Time Period begins. According to rend-spec-v3, "we want our time periods to start at 12:00UTC every day, so we subtract a "rotation time offset" of 12*60 minutes from the number of minutes since the epoch, before dividing by the time period (effectively making "our" epoch start at Jan 1, 1970 12:00UTC)." But this isn't exactly what the C Tor implementation does. In `hs_get_time_period_num(),` it defines the offset as `sr_state_get_phase_duration()`, which is tied to the voting interval and the constant SHARED_RANDOM_N_ROUNDS (which is 12). David, do you have any thoughts on the right solution here? Some options are: * We could document the current behavior. * We could add a consensus parameter for the time period offset. * We could define the time period offset as exactly 12 hours in all cases. (I guess this would break test networks though?) * Something else? best wishes, -- Nick
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