2020-02-14 18:19:55 +01:00
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import struct
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from lbry.crypto.hash import double_sha256
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from lbry.wallet.transaction import Transaction
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from lbry.wallet.bcd_data_stream import BCDataStream
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ZERO_BLOCK = bytes((0,)*32)
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class Block:
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__slots__ = (
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'version', 'block_hash', 'prev_block_hash',
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'merkle_root', 'claim_trie_root', 'timestamp',
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'bits', 'nonce', 'txs'
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)
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2020-02-28 05:52:18 +01:00
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def __init__(self, stream: BCDataStream):
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2020-02-14 18:19:55 +01:00
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header = stream.data.read(112)
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version, = struct.unpack('<I', header[:4])
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timestamp, bits, nonce = struct.unpack('<III', header[100:112])
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self.version = version
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self.block_hash = double_sha256(header)
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self.prev_block_hash = header[4:36]
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self.merkle_root = header[36:68]
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self.claim_trie_root = header[68:100][::-1]
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self.timestamp = timestamp
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self.bits = bits
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self.nonce = nonce
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tx_count = stream.read_compact_size()
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self.txs = [
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Transaction(position=i)._deserialize(stream)
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for i in range(tx_count)
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]
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@property
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def is_first_block(self):
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return self.prev_block_hash == ZERO_BLOCK
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