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Merge pull request #2509 from terencechain/patch-124 

Rename a few instances of `signature` to `message`
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Danny Ryan 2021-07-08 10:09:12 -06:00 committed by GitHub
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18
specs/altair/p2p-interface.md
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@ -105,7 +105,7 @@ Note that the `ForkDigestValue` path segment of the topic separates the old and
#### Global topics
Altair changes the type of the global beacon block topic and adds one global topic to propagate partially aggregated sync committee signatures to all potential proposers of beacon blocks.
Altair changes the type of the global beacon block topic and adds one global topic to propagate partially aggregated sync committee messages to all potential proposers of beacon blocks.
##### `beacon_block`
@ -117,7 +117,7 @@ See the [state transition document](./beacon-chain.md#beaconblockbody) for Altai
##### `sync_committee_contribution_and_proof`
This topic is used to propagate partially aggregated sync committee signatures to be included in future blocks.
This topic is used to propagate partially aggregated sync committee messages to be included in future blocks.
The following validations MUST pass before forwarding the `signed_contribution_and_proof` on the network; define `contribution_and_proof = signed_contribution_and_proof.message`, `contribution = contribution_and_proof.contribution`, and the following function `get_sync_subcommittee_pubkeys` for convenience:
@ -151,18 +151,18 @@ def get_sync_subcommittee_pubkeys(state: BeaconState, subcommittee_index: uint64
#### Sync committee subnets
Sync committee subnets are used to propagate unaggregated sync committee signatures to subsections of the network.
Sync committee subnets are used to propagate unaggregated sync committee messages to subsections of the network.
##### `sync_committee_{subnet_id}`
The `sync_committee_{subnet_id}` topics are used to propagate unaggregated sync committee signatures to the subnet `subnet_id` to be aggregated before being gossiped to the global `sync_committee_contribution_and_proof` topic.
The `sync_committee_{subnet_id}` topics are used to propagate unaggregated sync committee messages to the subnet `subnet_id` to be aggregated before being gossiped to the global `sync_committee_contribution_and_proof` topic.
The following validations MUST pass before forwarding the `sync_committee_message` on the network:
- _[IGNORE]_ The signature's slot is for the current slot (with a `MAXIMUM_GOSSIP_CLOCK_DISPARITY` allowance), i.e. `sync_committee_message.slot == current_slot`.
- _[IGNORE]_ The message's slot is for the current slot (with a `MAXIMUM_GOSSIP_CLOCK_DISPARITY` allowance), i.e. `sync_committee_message.slot == current_slot`.
- _[REJECT]_ The `subnet_id` is valid for the given validator, i.e. `subnet_id in compute_subnets_for_sync_committee(state, sync_committee_message.validator_index)`.
Note this validation implies the validator is part of the broader current sync committee along with the correct subcommittee.
- _[IGNORE]_ There has been no other valid sync committee signature for the declared `slot` for the validator referenced by `sync_committee_message.validator_index`
- _[IGNORE]_ There has been no other valid sync committee message for the declared `slot` for the validator referenced by `sync_committee_message.validator_index`
(this requires maintaining a cache of size `SYNC_COMMITTEE_SIZE // SYNC_COMMITTEE_SUBNET_COUNT` for each subnet that can be flushed after each slot).
Note this validation is _per topic_ so that for a given `slot`, multiple messages could be forwarded with the same `validator_index` as long as the `subnet_id`s are distinct.
- _[REJECT]_ The `signature` is valid for the message `beacon_block_root` for the validator referenced by `validator_index`.
@ -170,14 +170,14 @@ The following validations MUST pass before forwarding the `sync_committee_messag
#### Sync committees and aggregation
The aggregation scheme closely follows the design of the attestation aggregation scheme.
Sync committee signatures are broadcast into "subnets" defined by a topic.
Sync committee messages are broadcast into "subnets" defined by a topic.
The number of subnets is defined by `SYNC_COMMITTEE_SUBNET_COUNT` in the [Altair validator guide](./validator.md#constants).
Sync committee members are divided into "subcommittees" which are then assigned to a subnet for the duration of tenure in the sync committee.
Individual validators can be duplicated in the broader sync committee such that they are included multiple times in a given subcommittee or across multiple subcommittees.
Unaggregated signatures (along with metadata) are sent as `SyncCommitteeMessage`s on the `sync_committee_{subnet_id}` topics.
Unaggregated messages (along with metadata) are sent as `SyncCommitteeMessage`s on the `sync_committee_{subnet_id}` topics.
Aggregated sync committee signatures are packaged into (signed) `SyncCommitteeContribution` along with proofs and gossiped to the `sync_committee_contribution_and_proof` topic.
Aggregated sync committee messages are packaged into (signed) `SyncCommitteeContribution` along with proofs and gossiped to the `sync_committee_contribution_and_proof` topic.
### Transitioning the gossip