def locked_blocks_iterator(blockfile,
start_info=(0, 0),
cached_headers=50,
batch_size=50):
"""
This method loads blocks from disk, skipping any orphan blocks.
"""
f = blockfile
current_state = []
def change_state(bc, ops):
for op, bh, work in ops:
if op == 'add':
current_state.append(bh)
pass
else:
current_state.pop()
bc = BlockChain()
bc.add_change_callback(change_state)
bhs = []
index = 0
info_offset = start_info
while 1:
v = blockfile.next_offset(info_offset)
if v is None:
break
block_offset, info_offset = v
f.jump_to(block_offset)
bh = Block.parse_as_header(f)
bh.info = block_offset
bhs.append(bh)
if len(bhs) > batch_size:
bc.add_headers(bhs)
bhs = []
if len(current_state) > cached_headers:
for bh in current_state[:cached_headers]:
bh.index = index
yield bh
index += 1
bc.lock_to_index(index)
current_state = current_state[cached_headers:]
def main():
""" Method to retrieve Bitcoin blocks from downloaded files """
b = BlockChain()
print(str(b.last_block_hash()))
bf = Blockfiles(base_dir="E:\\Masterarbeit\\btc_node")
print(bf._path_for_file_index())
block = Block.parse_as_header(bf)
i = -1
for block in locked_blocks_iterator(start_info=(0, 0),
base_dir="E:\\Masterarbeit\\btc_node"):
i = i + 1
#if i == 100000:
print("Block")
print(block.version)
print(block.previous_block_hash)
print(block.merkle_root)
print(block.timestamp)
print(block.difficulty)
print(block.nonce)
for tx in block.txs:
#mytx = Tx(tx)
#print(mytx.txs_in)
print("Tx")
print(tx.version)
print(tx.lock_time)
print(tx.unspents)
for tx_in in tx.txs_in:
print(tx_in.address())
print("Input")
#print(str(tx_in.address))
print(str(tx_in.previous_hash))
print(str(tx_in.previous_index))
print(str(tx_in.script))
print(str(tx_in.sequence))
print(str(tx_in.witness))
for tx_out in tx.txs_out:
print("Output")
print(tx_out.address())
print(str(tx_out.coin_value))
print(str(tx_out.script))
def blockheader_for_offset_info(offset_info, base_dir=None):
f = Blockfiles(base_dir, offset_info)
block = Block.parse_as_header(f)
f.close()
return block
#!/usr/bin/env python
# -*- coding: utf-8 -*-
from pycoin.block import Block
import io, struct
import x13bcd_hash
def uint256_from_str(s):
r = 0L
t = struct.unpack("<IIIIIIII", s[:32])
for i in xrange(8):
r += t[i] << (i * 32)
return r
rawblock = '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'
b = Block.parse_as_header(io.BytesIO(rawblock.decode('hex')))
hash_bin = x13bcd_hash.getPoWHash(b.as_bin())
print uint256_from_str(hash_bin)
