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Merge pull request #341 from ethereum/target-committee-size 

change TARGET_COMMITTEE_SIZE to 128
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Danny Ryan 2018-12-22 07:12:21 -06:00 committed by GitHub
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specs/core/0_beacon-chain.md
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@ -159,7 +159,7 @@ Unless otherwise indicated, code appearing in `this style` is to be interpreted
| Name | Value | Unit |
| - | - | :-: |
| `SHARD_COUNT` | `2**10` (= 1,024) | shards |
| `TARGET_COMMITTEE_SIZE` | `2**8` (= 256) | [validators](#dfn-validator) |
| `TARGET_COMMITTEE_SIZE` | `2**7` (= 128) | [validators](#dfn-validator) |
| `EJECTION_BALANCE` | `2**4` (= 16) | ETH |
| `MAX_BALANCE_CHURN_QUOTIENT` | `2**5` (= 32) | - |
| `GWEI_PER_ETH` | `10**9` | Gwei/ETH |
@ -170,7 +170,7 @@ Unless otherwise indicated, code appearing in `this style` is to be interpreted
| `LATEST_RANDAO_MIXES_LENGTH` | `2**13` (= 8,192) | randao mixes |
| `EMPTY_SIGNATURE` | `[bytes48(0), bytes48(0)]` | - |
* For the safety of crosslinks a minimum committee size of 111 is [recommended](https://vitalik.ca/files/Ithaca201807_Sharding.pdf). (Unbiasable randomness with a Verifiable Delay Function (VDF) will improve committee robustness and lower the safe minimum committee size.) The shuffling algorithm generally ensures (assuming sufficient validators) committee sizes at least `TARGET_COMMITTEE_SIZE // 2`.
* For the safety of crosslinks `TARGET_COMMITTEE_SIZE` exceeds [the recommended minimum committee size of 111](https://vitalik.ca/files/Ithaca201807_Sharding.pdf); with sufficient active validators (at least `EPOCH_LENGTH * TARGET_COMMITTEE_SIZE`), the shuffling algorithm ensures committee sizes at least `TARGET_COMMITTEE_SIZE`. (Unbiasable randomness with a Verifiable Delay Function (VDF) will improve committee robustness and lower the safe minimum committee size.)
### Deposit contract