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Document how to derive fork context for LC gossip 

For LC gossip, the documentation did not specify what slot number to use
for deriving the gossip objects. This missing documentation is now added
to document using `attested_header.slot`.
This commit is contained in:
Etan Kissling 2022-10-27 21:23:09 +02:00
parent aac851f860
commit c399e11aa7
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specs/altair/light-client/p2p-interface.md
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@ -71,6 +71,17 @@ For light clients, the following validations MUST additionally pass before forwa
Light clients SHOULD call `process_light_client_finality_update` even if the message is ignored.
The gossip `ForkDigest`-context is determined based on `compute_fork_version(compute_epoch_at_slot(finality_update.attested_header.slot))`.
Per `context = compute_fork_digest(fork_version, genesis_validators_root)`:
[0]: # (eth2spec: skip)
| `fork_version` | Message SSZ type |
| ------------------------------- | ------------------------------------ |
| `GENESIS_FORK_VERSION` | n/a |
| `ALTAIR_FORK_VERSION` and later | `altair.LightClientFinalityUpdate` |
###### `light_client_optimistic_update`
This topic is used to propagate the latest `LightClientOptimisticUpdate` to light clients, allowing them to keep track of the latest `optimistic_header`.
@ -88,6 +99,17 @@ For light clients, the following validations MUST additionally pass before forwa
Light clients SHOULD call `process_light_client_optimistic_update` even if the message is ignored.
The gossip `ForkDigest`-context is determined based on `compute_fork_version(compute_epoch_at_slot(optimistic_update.attested_header.slot))`.
Per `context = compute_fork_digest(fork_version, genesis_validators_root)`:
[0]: # (eth2spec: skip)
| `fork_version` | Message SSZ type |
| ------------------------------- | ------------------------------------ |
| `GENESIS_FORK_VERSION` | n/a |
| `ALTAIR_FORK_VERSION` and later | `altair.LightClientOptimisticUpdate` |
### The Req/Resp domain
#### Messages