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Further clarify light client slot checks

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Michael Sproul 2022-11-11 22:09:33 +11:00 committed by GitHub
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specs/altair/light-client/p2p-interface.md
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@ -59,7 +59,7 @@ New global topics are added to provide light clients with the latest updates.
This topic is used to propagate the latest `LightClientFinalityUpdate` to light clients, allowing them to keep track of the latest `finalized_header`.
The following validations MUST pass before forwarding the `finality_update` on the network.
- _[IGNORE]_ The `finalized_header.slot` is greater than the `slot` of all previously forwarded finality updates
- _[IGNORE]_ The `finalized_header.slot` is greater than that of all previously forwarded `finality_update`s
- _[IGNORE]_ The `finality_update` is received after the block at `signature_slot` was given enough time to propagate through the network -- i.e. validate that one-third of `finality_update.signature_slot` has transpired (`SECONDS_PER_SLOT / INTERVALS_PER_SLOT` seconds after the start of the slot, with a `MAXIMUM_GOSSIP_CLOCK_DISPARITY` allowance)
For full nodes, the following validations MUST additionally pass before forwarding the `finality_update` on the network.
@ -87,7 +87,7 @@ Per `context = compute_fork_digest(fork_version, genesis_validators_root)`:
This topic is used to propagate the latest `LightClientOptimisticUpdate` to light clients, allowing them to keep track of the latest `optimistic_header`.
The following validations MUST pass before forwarding the `optimistic_update` on the network.
- _[IGNORE]_ The `attested_header.slot` is greater than the `slot` of all previously forwarded optimistic updates
- _[IGNORE]_ The `attested_header.slot` is greater than that of all previously forwarded `optimistic_update`s
- _[IGNORE]_ The `optimistic_update` is received after the block at `signature_slot` was given enough time to propagate through the network -- i.e. validate that one-third of `optimistic_update.signature_slot` has transpired (`SECONDS_PER_SLOT / INTERVALS_PER_SLOT` seconds after the start of the slot, with a `MAXIMUM_GOSSIP_CLOCK_DISPARITY` allowance)
For full nodes, the following validations MUST additionally pass before forwarding the `optimistic_update` on the network.