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Merge pull request #2719 from paulhauner/patch-33 

Genesis execution block handling
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Danny Ryan 2021-11-11 08:54:14 -07:00 committed by GitHub
parent b963f7ce96 61207c5b61
commit fb34e162ef
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specs/merge/validator.md
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@ -44,8 +44,11 @@ Please see related Beacon Chain doc before continuing and use them as a referenc
def get_pow_block_at_terminal_total_difficulty(pow_chain: Dict[Hash32, PowBlock]) -> Optional[PowBlock]: def get_pow_block_at_terminal_total_difficulty(pow_chain: Dict[Hash32, PowBlock]) -> Optional[PowBlock]:
# `pow_chain` abstractly represents all blocks in the PoW chain # `pow_chain` abstractly represents all blocks in the PoW chain
for block in pow_chain: for block in pow_chain:
parent = pow_chain[block.parent_hash]
block_reached_ttd = block.total_difficulty >= TERMINAL_TOTAL_DIFFICULTY block_reached_ttd = block.total_difficulty >= TERMINAL_TOTAL_DIFFICULTY
# If genesis block, no parent exists so reaching TTD alone qualifies as valid terminal block
if block_reached_ttd and block.parent_hash == Hash32():
return block
parent = pow_chain[block.parent_hash]
parent_reached_ttd = parent.total_difficulty >= TERMINAL_TOTAL_DIFFICULTY parent_reached_ttd = parent.total_difficulty >= TERMINAL_TOTAL_DIFFICULTY
if block_reached_ttd and not parent_reached_ttd: if block_reached_ttd and not parent_reached_ttd:
return block return block