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Merge pull request #3063 from etan-status/lc-gossipdigests 

Document how to derive fork context for LC gossip
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Hsiao-Wei Wang 2022-11-02 13:12:23 +08:00 committed by GitHub
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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