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Add Offline Duration Measurement section content

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Cofson
2025-12-23 18:43:09 +01:00
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@@ -410,9 +410,20 @@ The following example explains why $T_\text{offline}$ should not be set too long
### Offline Duration Measurement
> **TODO**: This section is referenced in the source document
> but not yet defined.
> Content to be added describing recommended ways to measure offline duration.
As defined in [Setting the Fork Choice Rule](#setting-the-fork-choice-rule),
when a node is restarted,
it should be able to choose a proper fork choice rule
depending on how long it has been offline since it last used the Online rule.
It is considered unsafe to rely on any external information
(e.g. the slot or height of peer's tip) to check how long the node has been offline,
since such information could be manipulated as an attack vector.
Instead, it is recommended to employ a local method to measure the offline duration.
While the specific implementation is left to the discretion of implementers,
one approach is for the node to periodically record the current time to a local file
while it is running with the **Online** fork choice rule.
Upon restart, it can use this timestamp to calculate how long it has been offline.
### Checkpoint Provider HTTP API