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phase0: enable a tunable genesis time

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Raw Pong Ghmoa 2020-06-01 13:59:03 +02:00 committed by Danny Ryan
parent bdf9f0226d
commit 34412130c5
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1 changed files with 3 additions and 3 deletions
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specs/phase0/beacon-chain.md
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@ -218,7 +218,7 @@ The following values are (non-configurable) constants used throughout the specif
| Name | Value | Unit | Duration | | Name | Value | Unit | Duration |
| - | - | :-: | :-: | | - | - | :-: | :-: |
| `MIN_GENESIS_DELAY` | `86400` | seconds | 1 day | | `GENESIS_DELAY` | `172800` | seconds | 2 days |
| `SECONDS_PER_SLOT` | `12` | seconds | 12 seconds | | `SECONDS_PER_SLOT` | `12` | seconds | 12 seconds |
| `SECONDS_PER_ETH1_BLOCK` | `14` | seconds | 14 seconds | | `SECONDS_PER_ETH1_BLOCK` | `14` | seconds | 14 seconds |
| `MIN_ATTESTATION_INCLUSION_DELAY` | `2**0` (= 1) | slots | 12 seconds | | `MIN_ATTESTATION_INCLUSION_DELAY` | `2**0` (= 1) | slots | 12 seconds |
@ -1137,7 +1137,7 @@ Before the Ethereum 2.0 genesis has been triggered, and for every Ethereum 1.0 b
- `eth1_timestamp` is the Unix timestamp corresponding to `eth1_block_hash` - `eth1_timestamp` is the Unix timestamp corresponding to `eth1_block_hash`
- `deposits` is the sequence of all deposits, ordered chronologically, up to (and including) the block with hash `eth1_block_hash` - `deposits` is the sequence of all deposits, ordered chronologically, up to (and including) the block with hash `eth1_block_hash`
Eth1 blocks must only be considered once they are at least `SECONDS_PER_ETH1_BLOCK * ETH1_FOLLOW_DISTANCE` seconds old (i.e. `eth1_timestamp + SECONDS_PER_ETH1_BLOCK * ETH1_FOLLOW_DISTANCE <= current_unix_time`). Due to this constraint, if `MIN_GENESIS_DELAY < SECONDS_PER_ETH1_BLOCK * ETH1_FOLLOW_DISTANCE`, then the `genesis_time` can happen before the time/state is first known. Values should be configured to avoid this case. Eth1 blocks must only be considered once they are at least `SECONDS_PER_ETH1_BLOCK * ETH1_FOLLOW_DISTANCE` seconds old (i.e. `eth1_timestamp + SECONDS_PER_ETH1_BLOCK * ETH1_FOLLOW_DISTANCE <= current_unix_time`). Due to this constraint, if `GENESIS_DELAY < SECONDS_PER_ETH1_BLOCK * ETH1_FOLLOW_DISTANCE`, then the `genesis_time` can happen before the time/state is first known. Values should be configured to avoid this case.
```python ```python
def initialize_beacon_state_from_eth1(eth1_block_hash: Bytes32, def initialize_beacon_state_from_eth1(eth1_block_hash: Bytes32,
@ -1149,7 +1149,7 @@ def initialize_beacon_state_from_eth1(eth1_block_hash: Bytes32,
epoch=GENESIS_EPOCH, epoch=GENESIS_EPOCH,
) )
state = BeaconState( state = BeaconState(
genesis_time=eth1_timestamp - eth1_timestamp % MIN_GENESIS_DELAY + 2 * MIN_GENESIS_DELAY, genesis_time=eth1_timestamp + GENESIS_DELAY,
fork=fork, fork=fork,
eth1_data=Eth1Data(block_hash=eth1_block_hash, deposit_count=len(deposits)), eth1_data=Eth1Data(block_hash=eth1_block_hash, deposit_count=len(deposits)),
latest_block_header=BeaconBlockHeader(body_root=hash_tree_root(BeaconBlockBody())), latest_block_header=BeaconBlockHeader(body_root=hash_tree_root(BeaconBlockBody())),