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eth2.0-specs
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implement (unpolished) solution for #1446, based on suggested use of eth1 hash

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protolambda 2019-10-25 13:22:59 +02:00
parent f1bf0bf85b
commit 2186c45f84
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2 changed files with 10 additions and 1 deletions
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3
specs/core/0_beacon-chain.md
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@ -1113,6 +1113,9 @@ def initialize_beacon_state_from_eth1(eth1_block_hash: Hash,
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())),
) )
# Set the initial RANDAO mixes to hashes seeded by the Eth1 hash, to limit deposit ordering committee bias.
for i in range(MIN_SEED_LOOKAHEAD + 1):
state.randao_mixes[EPOCHS_PER_HISTORICAL_VECTOR - i - 1] = hash(eth1_block_hash + int_to_bytes(i, 8))
# Process deposits # Process deposits
leaves = list(map(lambda deposit: deposit.data, deposits)) leaves = list(map(lambda deposit: deposit.data, deposits))

8
test_libs/pyspec/eth2spec/test/helpers/genesis.py
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@ -19,17 +19,23 @@ def build_mock_validator(spec, i: int, balance: int):
def create_genesis_state(spec, num_validators): def create_genesis_state(spec, num_validators):
deposit_root = b'\x42' * 32 deposit_root = b'\x42' * 32
eth1_block_hash = b'\xda' * 32
state = spec.BeaconState( state = spec.BeaconState(
genesis_time=0, genesis_time=0,
eth1_deposit_index=num_validators, eth1_deposit_index=num_validators,
eth1_data=spec.Eth1Data( eth1_data=spec.Eth1Data(
deposit_root=deposit_root, deposit_root=deposit_root,
deposit_count=num_validators, deposit_count=num_validators,
block_hash=spec.Hash(), block_hash=eth1_block_hash,
), ),
latest_block_header=spec.BeaconBlockHeader(body_root=spec.hash_tree_root(spec.BeaconBlockBody())), latest_block_header=spec.BeaconBlockHeader(body_root=spec.hash_tree_root(spec.BeaconBlockBody())),
) )
# Set the initial RANDAO mixes to hashes seeded by the Eth1 hash, to limit deposit ordering committee bias.
for i in range(spec.MIN_SEED_LOOKAHEAD + 1):
state.randao_mixes[spec.EPOCHS_PER_HISTORICAL_VECTOR - i - 1] = \
spec.hash(eth1_block_hash + spec.int_to_bytes(i, 8))
# We "hack" in the initial validators, # We "hack" in the initial validators,
# as it is much faster than creating and processing genesis deposits for every single test case. # as it is much faster than creating and processing genesis deposits for every single test case.
state.balances = [spec.MAX_EFFECTIVE_BALANCE] * num_validators state.balances = [spec.MAX_EFFECTIVE_BALANCE] * num_validators