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Add getter to Vyper contract for Merkle branches

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Returns the Merkle branch for the leaf at index `index`. This getter provides
an alternative way for beacon chain proposers to access the Merkle tree of
deposits rather than being Ethereum 1.0 light clients. The method can be
called on a trusted Ethereum 1.0 archive node at specific past block numbers
to retrieve the Merkle branch needed to register a validator.
This commit is contained in:
Ben Edgington 2019-01-08 19:47:14 +00:00
parent 9dfc459849
commit 994a42e6b1
1 changed files with 12 additions and 0 deletions
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specs/core/0_beacon-chain.md
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@ -692,6 +692,18 @@ def deposit(deposit_input: bytes[2048]):
def get_deposit_root() -> bytes32:
return self.deposit_tree[1]
@public
@constant
def get_merkle_branch(index: uint256) -> bytes32[32]: # size is DEPOSIT_CONTRACT_TREE_DEPTH (symbolic const not supported)
idx: uint256 = index + TWO_TO_POWER_OF_TREE_DEPTH
ret: bytes32[32] # size is DEPOSIT_CONTRACT_TREE_DEPTH
for i in range(DEPOSIT_CONTRACT_TREE_DEPTH):
if idx % 2 == 1:
ret[i] = self.deposit_tree[idx - 1]
else:
ret[i] = self.deposit_tree[idx + 1]
idx /= 2
return ret
```
## Beacon chain processing