def createPyBlock(prevBlkHeader, txlist):
print 'Creating block (%d tx): Computing nonce...' % len(txlist),
extraNonce = random.randrange(2**32)
txlist[0].inputs[0].binScript = int_to_binary(extraNonce, widthBytes=4)
aGoodNonce = 0
numTries = 0
# Instead of changing the txin script as a nonce, we slightly modify
# the timestamp
newbh = CppBlockHeader()
while aGoodNonce == 0:
blk = PyBlock(prevBlkHeader, txlist)
newbh = CppBlockHeader()
newbh.unserialize_1_(blk.blockHeader.serialize())
tstamp = newbh.getTimestamp()
newbh.setTimestamp(tstamp+numTries)
aGoodNonce = newbh.findNonce()
numTries += 1
blk.blockHeader.nonce = aGoodNonce
blk.blockHeader.timestamp = newbh.getTimestamp()
print 'Done!'
return blk
def createPyBlock(prevBlkHeader, txlist, useMinDiff=True):
print 'Creating block (%d tx): Computing nonce...' % len(txlist)
extraNonce = random.randrange(2**32)
txlist[0].inputs[0].binScript = int_to_binary(extraNonce, widthBytes=4)
aGoodNonce = False
numTries = 0
newbh = CppBlockHeader()
# Keep searching for a good nonce 'til we find one. See
# http://bitcoin.stackexchange.com/questions/5048/what-is-the-extranonce for
# more info on why we mod the timestamp instead of the coinbase script
# (extraNonce).
nonceVal = -1
while not aGoodNonce:
blk = PyBlock(prevBlkHeader, txlist)
blk.blockHeader.timestamp += numTries
# Set up the difficulty-related vars. Assume min diff (0x1d00ffff) unless
# indicated otherwise, then use values for next-highest diff (0x1d00fffe).
diffHex = 'FFFF0000000000000000000000000000000000000000000000000000h'
if not useMinDiff:
blk.blockHeader.diffBits = hex_to_binary('1d00fffe', BIGENDIAN)
diffHex = 'FFFE0000000000000000000000000000000000000000000000000000h'
newbh = CppBlockHeader()
newbh.unserialize_1_(blk.blockHeader.serialize())
if fakeBlocks:
nonceVal = 1414
aGoodNonce = True
else:
# C++ returns -1 if a nonce isn't found.
nonceVal = newbh.findNonce(diffHex)
if nonceVal != -1:
aGoodNonce = True
numTries += 1
blk.blockHeader.nonce = nonceVal
blk.blockHeader.timestamp = newbh.getTimestamp()
print 'Done!'
return blk
def createPyBlock(prevBlkHeader, txlist, useMinDiff=True):
print 'Creating block (%d tx): Computing nonce...' % len(txlist)
extraNonce = random.randrange(2**32)
txlist[0].inputs[0].binScript = int_to_binary(extraNonce, widthBytes=4)
aGoodNonce = False
numTries = 0
newbh = CppBlockHeader()
# Keep searching for a good nonce 'til we find one. See
# http://bitcoin.stackexchange.com/questions/5048/what-is-the-extranonce for
# more info on why we mod the timestamp instead of the coinbase script
# (extraNonce).
nonceVal = -1
while not aGoodNonce:
blk = PyBlock(prevBlkHeader, txlist)
blk.blockHeader.timestamp += numTries
# Set up the difficulty-related vars. Assume min diff (0x1d00ffff) unless
# indicated otherwise, then use values for next-highest diff (0x1d00fffe).
diffHex = 'FFFF0000000000000000000000000000000000000000000000000000h'
if not useMinDiff:
blk.blockHeader.diffBits = hex_to_binary('1d00fffe', BIGENDIAN)
diffHex = 'FFFE0000000000000000000000000000000000000000000000000000h'
newbh = CppBlockHeader()
newbh.unserialize_1_(blk.blockHeader.serialize())
if fakeBlocks:
nonceVal = 1414
aGoodNonce = True
else:
# C++ returns -1 if a nonce isn't found.
nonceVal = newbh.findNonce(diffHex)
if nonceVal != -1:
aGoodNonce = True
numTries += 1
blk.blockHeader.nonce = nonceVal
blk.blockHeader.timestamp = newbh.getTimestamp()
print 'Done!'
return blk
