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Merge pull request #2279 from ethereum/ralexstokes-patch-2 

Fix aggregation bits example in Altair validator guide
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Danny Ryan 2021-03-29 12:37:47 -06:00 committed by GitHub
parent 6f07448883 a51c5ee4c2
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specs/altair/validator.md
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@ -355,7 +355,7 @@ Set `contribution.subcommittee_index` to the index for the subcommittee index co
Let `contribution.aggregation_bits` be a `Bitvector[SYNC_COMMITTEE_SIZE // SYNC_COMMITTEE_SUBNET_COUNT]`, where the `index`th bit is set in the `Bitvector` for each corresponding validator included in this aggregate from the corresponding subcommittee.
An aggregator needs to find the index in the sync committee (as returned by `get_sync_committee_indices`) for a given validator referenced by `sync_committee_signature.validator_index` and map the sync committee index to an index in the subcommittee (along with the prior `subcommittee_index`). This index within the subcommittee is the one set in the `Bitvector`.
For example, a validator with index `2044` could be at index `15` in the current sync committee. This sync committee index maps to `subcommittee_index` `1` with position `7` in the `Bitvector` for the contribution.
For example, if a validator with index `2044` is pseudo-randomly sampled to sync committee index `135`. This sync committee index maps to `subcommittee_index` `1` with position `7` in the `Bitvector` for the contribution.
Also note that a validator **could be included multiple times** in a given subcommittee such that multiple bits are set for a single `SyncCommitteeSignature`.
###### Signature