AaronFiore/electrum
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Add pow_hash_header abstraction (#7592)

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There is no reason why the hash function for identifying a block and the
hash function used to instantiate Hashcash must be the same; it's only a
coincidence that Bitcoin happens to use the same hash for both use
cases.  Reflecting this fact by adding this abstraction makes the code
more flexible.

Co-authored-by: Jeremy Rand <jeremyrand@danwin1210.de>
This commit is contained in:
JeremyRand
2023-10-31 14:02:20 +00:00
committed by GitHub
parent a3d7df48db
commit a7f0c90c8a
1 changed files with 7 additions and 3 deletions
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electrum/blockchain.py
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@@ -86,6 +86,9 @@ def hash_raw_header(header: str) -> str:
return hash_encode(sha256d(bfh(header))) return hash_encode(sha256d(bfh(header)))
pow_hash_header = hash_header
# key: blockhash hex at forkpoint # key: blockhash hex at forkpoint
# the chain at some key is the best chain that includes the given hash # the chain at some key is the best chain that includes the given hash
blockchains = {} # type: Dict[str, Blockchain] blockchains = {} # type: Dict[str, Blockchain]
@@ -305,9 +308,10 @@ class Blockchain(Logger):
bits = cls.target_to_bits(target) bits = cls.target_to_bits(target)
if bits != header.get('bits'): if bits != header.get('bits'):
raise InvalidHeader("bits mismatch: %s vs %s" % (bits, header.get('bits'))) raise InvalidHeader("bits mismatch: %s vs %s" % (bits, header.get('bits')))
block_hash_as_num = int.from_bytes(bfh(_hash), byteorder='big') _pow_hash = pow_hash_header(header)
if block_hash_as_num > target: pow_hash_as_num = int.from_bytes(bfh(_pow_hash), byteorder='big')
raise InvalidHeader(f"insufficient proof of work: {block_hash_as_num} vs target {target}") if pow_hash_as_num > target:
raise InvalidHeader(f"insufficient proof of work: {pow_hash_as_num} vs target {target}")
def verify_chunk(self, index: int, data: bytes) -> None: def verify_chunk(self, index: int, data: bytes) -> None:
num = len(data) // HEADER_SIZE num = len(data) // HEADER_SIZE