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Merge branch 'dev' into mypy

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Hsiao-Wei Wang 2019-06-18 08:24:23 -06:00
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5 changed files with 29 additions and 35 deletions
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6
configs/constant_presets/mainnet.yaml
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@ -15,8 +15,6 @@ MAX_INDICES_PER_ATTESTATION: 4096
MIN_PER_EPOCH_CHURN_LIMIT: 4
# 2**16 (= 65,536)
CHURN_LIMIT_QUOTIENT: 65536
# Normalizes base rewards
BASE_REWARDS_PER_EPOCH: 5
# See issue 563
SHUFFLE_ROUND_COUNT: 90
@ -25,8 +23,6 @@ SHUFFLE_ROUND_COUNT: 90
# ---------------------------------------------------------------
# **TBD**
DEPOSIT_CONTRACT_ADDRESS: 0x1234567890123456789012345678901234567890
# 2**5 (= 32)
DEPOSIT_CONTRACT_TREE_DEPTH: 32
# Gwei values
@ -46,8 +42,6 @@ EFFECTIVE_BALANCE_INCREMENT: 1000000000
GENESIS_FORK_VERSION: 0x00000000
# 0, GENESIS_EPOCH is derived from this constant
GENESIS_SLOT: 0
# 2**64 - 1
FAR_FUTURE_EPOCH: 18446744073709551615
BLS_WITHDRAWAL_PREFIX: 0

6
configs/constant_presets/minimal.yaml
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@ -14,8 +14,6 @@ MAX_INDICES_PER_ATTESTATION: 4096
MIN_PER_EPOCH_CHURN_LIMIT: 4
# 2**16 (= 65,536)
CHURN_LIMIT_QUOTIENT: 65536
# Normalizes base rewards
BASE_REWARDS_PER_EPOCH: 5
# [customized] Faster, but unsecure.
SHUFFLE_ROUND_COUNT: 10
@ -24,8 +22,6 @@ SHUFFLE_ROUND_COUNT: 10
# ---------------------------------------------------------------
# **TBD**
DEPOSIT_CONTRACT_ADDRESS: 0x1234567890123456789012345678901234567890
# 2**5 (= 32)
DEPOSIT_CONTRACT_TREE_DEPTH: 32
# Gwei values
@ -45,8 +41,6 @@ EFFECTIVE_BALANCE_INCREMENT: 1000000000
GENESIS_FORK_VERSION: 0x00000000
# 0, GENESIS_EPOCH is derived from this constant
GENESIS_SLOT: 0
# 2**64 - 1
FAR_FUTURE_EPOCH: 18446744073709551615
BLS_WITHDRAWAL_PREFIX: 0

39
specs/core/0_beacon-chain.md
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@ -12,8 +12,8 @@
- [Terminology](#terminology)
- [Custom types](#custom-types)
- [Constants](#constants)
- [Configuration](#configuration)
- [Misc](#misc)
- [Deposit contract](#deposit-contract)
- [Gwei values](#gwei-values)
- [Initial values](#initial-values)
- [Time parameters](#time-parameters)
@ -169,7 +169,18 @@ We define the following Python custom types for type hinting and readability:
## Constants
*Note*: The default mainnet values for the constants are included here for spec-design purposes.
The following values are (non-configurable) constants used throughout the specification.
| Name | Value |
| - | - |
| `FAR_FUTURE_EPOCH` | `Epoch(2**64 - 1)` |
| `ZERO_HASH` | `Hash(b'\x00' * 32)` |
| `BASE_REWARDS_PER_EPOCH` | `5` |
| `DEPOSIT_CONTRACT_TREE_DEPTH` | `2**5` (= 32) |
## Configuration
*Note*: The default mainnet configuration values are included here for spec-design purposes.
The different configurations for mainnet, testnets, and YAML-based testing can be found in the `configs/constant_presets/` directory.
These configurations are updated for releases, but may be out of sync during `dev` changes.
@ -182,17 +193,10 @@ These configurations are updated for releases, but may be out of sync during `de
| `MAX_INDICES_PER_ATTESTATION` | `2**12` (= 4,096) |
| `MIN_PER_EPOCH_CHURN_LIMIT` | `2**2` (= 4) |
| `CHURN_LIMIT_QUOTIENT` | `2**16` (= 65,536) |
| `BASE_REWARDS_PER_EPOCH` | `5` |
| `SHUFFLE_ROUND_COUNT` | `90` |
* 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 `SLOTS_PER_EPOCH * TARGET_COMMITTEE_SIZE`), the shuffling algorithm ensures committee sizes of 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
| Name | Value |
| - | - |
| `DEPOSIT_CONTRACT_TREE_DEPTH` | `2**5` (= 32) |
### Gwei values
| Name | Value |
@ -208,15 +212,13 @@ These configurations are updated for releases, but may be out of sync during `de
| - | - |
| `GENESIS_SLOT` | `Slot(0)` |
| `GENESIS_EPOCH` | `Epoch(0)` |
| `FAR_FUTURE_EPOCH` | `Epoch(2**64 - 1)` |
| `ZERO_HASH` | `b'\x00' * 32` |
| `BLS_WITHDRAWAL_PREFIX` | `0` |
### Time parameters
| Name | Value | Unit | Duration |
| - | - | :-: | :-: |
| `MIN_ATTESTATION_INCLUSION_DELAY` | `2**2` (= 4) | slots | 24 seconds |
| `MIN_ATTESTATION_INCLUSION_DELAY` | `2**0` (= 1) | slots | 6 seconds |
| `SLOTS_PER_EPOCH` | `2**6` (= 64) | slots | 6.4 minutes |
| `MIN_SEED_LOOKAHEAD` | `2**0` (= 1) | epochs | 6.4 minutes |
| `ACTIVATION_EXIT_DELAY` | `2**2` (= 4) | epochs | 25.6 minutes |
@ -241,14 +243,13 @@ These configurations are updated for releases, but may be out of sync during `de
| Name | Value |
| - | - |
| `BASE_REWARD_FACTOR` | `2**5` (= 32) |
| `BASE_REWARD_FACTOR` | `2**6` (= 64) |
| `WHISTLEBLOWING_REWARD_QUOTIENT` | `2**9` (= 512) |
| `PROPOSER_REWARD_QUOTIENT` | `2**3` (= 8) |
| `INACTIVITY_PENALTY_QUOTIENT` | `2**25` (= 33,554,432) |
| `MIN_SLASHING_PENALTY_QUOTIENT` | `2**5` (= 32) |
* **The `BASE_REWARD_FACTOR` is NOT final. Once all other protocol details are finalized, it will be adjusted to target a theoretical maximum total issuance of `2**21` ETH per year if `2**27` ETH is validating (and therefore `2**20` per year if `2**25` ETH is validating, etc.)**
* The `INACTIVITY_PENALTY_QUOTIENT` equals `INVERSE_SQRT_E_DROP_TIME**2` where `INVERSE_SQRT_E_DROP_TIME := 2**12 epochs` (~18 days) is the time it takes the inactivity penalty to reduce the balance of non-participating [validators](#dfn-validator) to about `1/sqrt(e) ~= 60.6%`. Indeed, the balance retained by offline [validators](#dfn-validator) after `n` epochs is about `(1 - 1/INACTIVITY_PENALTY_QUOTIENT)**(n**2/2)` so after `INVERSE_SQRT_E_DROP_TIME` epochs it is roughly `(1 - 1/INACTIVITY_PENALTY_QUOTIENT)**(INACTIVITY_PENALTY_QUOTIENT/2) ~= 1/sqrt(e)`.
* The `INACTIVITY_PENALTY_QUOTIENT` equals `INVERSE_SQRT_E_DROP_TIME**2` where `INVERSE_SQRT_E_DROP_TIME := 2**12 epochs` (about 18 days) is the time it takes the inactivity penalty to reduce the balance of non-participating [validators](#dfn-validator) to about `1/sqrt(e) ~= 60.6%`. Indeed, the balance retained by offline [validators](#dfn-validator) after `n` epochs is about `(1 - 1/INACTIVITY_PENALTY_QUOTIENT)**(n**2/2)` so after `INVERSE_SQRT_E_DROP_TIME` epochs it is roughly `(1 - 1/INACTIVITY_PENALTY_QUOTIENT)**(INACTIVITY_PENALTY_QUOTIENT/2) ~= 1/sqrt(e)`.
### Max operations per block
@ -1422,10 +1423,10 @@ def get_attestation_deltas(state: BeaconState) -> Tuple[List[Gwei], List[Gwei]]:
a for a in matching_source_attestations
if index in get_attesting_indices(state, a.data, a.aggregation_bitfield)
], key=lambda a: a.inclusion_delay)
rewards[attestation.proposer_index] += Gwei(get_base_reward(state, index) // PROPOSER_REWARD_QUOTIENT)
rewards[index] += Gwei(
get_base_reward(state, index) * MIN_ATTESTATION_INCLUSION_DELAY // attestation.inclusion_delay
)
proposer_reward = Gwei(get_base_reward(state, index) // PROPOSER_REWARD_QUOTIENT)
rewards[attestation.proposer_index] += proposer_reward
max_attester_reward = get_base_reward(state, index) - proposer_reward
rewards[index] += Gwei(max_attester_reward * MIN_ATTESTATION_INCLUSION_DELAY // attestation.inclusion_delay)
# Inactivity penalty
finality_delay = previous_epoch - state.finalized_epoch

4
specs/core/0_fork-choice.md
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@ -9,7 +9,7 @@
- [Table of contents](#table-of-contents)
- [Introduction](#introduction)
- [Prerequisites](#prerequisites)
- [Constants](#constants)
- [Configuration](#configuration)
- [Time parameters](#time-parameters)
- [Beacon chain processing](#beacon-chain-processing)
- [Beacon chain fork choice rule](#beacon-chain-fork-choice-rule)
@ -26,7 +26,7 @@ This document represents the specification for the beacon chain fork choice rule
All terminology, constants, functions, and protocol mechanics defined in the [Phase 0 -- The Beacon Chain](./0_beacon-chain.md) doc are requisite for this document and used throughout. Please see the Phase 0 doc before continuing and use as a reference throughout.
## Constants
## Configuration
### Time parameters

9
specs/core/1_shard-data-chains.md
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@ -9,8 +9,9 @@
- [Ethereum 2.0 Phase 1 -- Shard Data Chains](#ethereum-20-phase-1----shard-data-chains)
- [Table of contents](#table-of-contents)
- [Introduction](#introduction)
- [Constants](#constants)
- [Configuration](#configuration)
- [Misc](#misc)
- [Initial values](#initial-values)
- [Time parameters](#time-parameters)
- [Signature domains](#signature-domains)
- [Data structures](#data-structures)
@ -38,7 +39,7 @@
This document describes the shard data layer and the shard fork choice rule in Phase 1 of Ethereum 2.0.
## Constants
## Configuration
### Misc
@ -46,6 +47,10 @@ This document describes the shard data layer and the shard fork choice rule in P
| - | - |
| `BYTES_PER_SHARD_BLOCK_BODY` | `2**14` (= 16,384) |
| `MAX_SHARD_ATTESTIONS` | `2**4` (= 16) |
### Initial values
| Name | Value |
| `PHASE_1_FORK_EPOCH` | **TBD** |
| `PHASE_1_FORK_SLOT` | **TBD** |
| `GENESIS_SHARD_SLOT` | 0 |