From 55ac9ac313c9abb494adb6dc33e57b00388a6260 Mon Sep 17 00:00:00 2001 From: Danny Ryan Date: Wed, 19 Dec 2018 15:09:17 -0600 Subject: [PATCH 1/2] change TARGET_COMMITTEE_SIZE to 128 --- specs/core/0_beacon-chain.md | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/specs/core/0_beacon-chain.md b/specs/core/0_beacon-chain.md index 4e105eb0f..1a316cc1c 100644 --- a/specs/core/0_beacon-chain.md +++ b/specs/core/0_beacon-chain.md @@ -158,7 +158,7 @@ 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 | @@ -169,7 +169,7 @@ 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 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`. ### Deposit contract From a60ab53647452689c6eea3811e99f5a455072bf0 Mon Sep 17 00:00:00 2001 From: Danny Ryan Date: Sat, 22 Dec 2018 07:11:58 -0600 Subject: [PATCH 2/2] PR feedback --- specs/core/0_beacon-chain.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/specs/core/0_beacon-chain.md b/specs/core/0_beacon-chain.md index 1a316cc1c..f01809208 100644 --- a/specs/core/0_beacon-chain.md +++ b/specs/core/0_beacon-chain.md @@ -169,7 +169,7 @@ 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`. +* 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