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One more new_deposit_root, and chainStarted as public bool

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vbuterin 2019-01-29 19:00:39 -06:00 committed by GitHub
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1 changed files with 3 additions and 1 deletions
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specs/core/0_beacon-chain.md
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@ -660,6 +660,7 @@ zerohashes: bytes32[32]
branch: bytes32[32]
deposit_count: uint256
full_deposit_count: uint256
chainStarted: public(bool)
@public
def __init__():
@ -716,7 +717,8 @@ def deposit(deposit_input: bytes[512]):
if self.full_deposit_count == CHAIN_START_FULL_DEPOSIT_THRESHOLD:
timestamp_day_boundary: uint256 = as_unitless_number(block.timestamp) - as_unitless_number(block.timestamp) % SECONDS_PER_DAY + SECONDS_PER_DAY
chainstart_time: bytes[8] = slice(concat("", convert(timestamp_day_boundary, bytes32)), start=24, len=8)
log.ChainStart(self.get_deposit_root(), chainstart_time)
log.ChainStart(new_deposit_root, chainstart_time)
self.chainStarted = True
```
Note: to save ~10x on gas this contract uses a somewhat unintuitive progressive Merkle root calculation algo that requires only O(log(n)) storage. See https://github.com/ethereum/research/blob/master/beacon_chain_impl/progressive_merkle_tree.py for an implementation of the same algo in python tested for correctness.