Bitcoin

Anonymous (anonymous@undisclosed.example.com) — 2018-05-04T08:00:39+00:00

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	===== MtGox YubiKey =====		===== MtGox YubiKey =====

-	[[http://bitcointalk.org/index.php?topic=26385.0\|YubiKey II]] is and USB device provided and used by MtGox as an OTP device to login into their webpage.	+	[[http://bitcointalk.org/index.php?topic=26385.0\|YubiKey II]] is an USB device provided and used by MtGox as an OTP device to login into their webpage.

	{{https://yubikey.mtgox.com/img/yubikey_clean_small.png}}		{{https://yubikey.mtgox.com/img/yubikey_clean_small.png}}
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	==== YubiKey serial num ====		==== YubiKey serial num ====

-	* It is not an QR code. It is [[wp>Data_Matrix]] in ASCII encoding containing 6digits number printed under. You can generate your own [[http://www.racoindustries.com/barcodegenerator/2d/datamatrix.aspx\|here]].	+	* It is not a QR code. It is [[wp>Data_Matrix]] in ASCII encoding containing 6digits number printed under. You can generate your own [[http://www.racoindustries.com/barcodegenerator/2d/datamatrix.aspx\|here]].

	==== One Time Password ====		==== One Time Password ====

project:bitcoin:who_stole_my_btc.py

Anonymous (anonymous@undisclosed.example.com) — 2015-06-04T18:38:53+00:00

	current
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	+	<code python who_stole_my_btc.py>
	+	#!/usr/bin/env python

	+	import sys
	+	# needs pybitcointools
	+	from bitcoin import *
	+
	+	if len(sys.argv) < 2:
	+	print "Enter transaction id in hex as first argument"
	+	sys.exit(1)
	+
	+	txid = sys.argv[1]
	+
	+	tx = fetchtx(txid)
	+
	+	inScript = deserialize(tx)['ins'][0]['script']
	+	inDeserialized = deserialize_script(inScript)
	+
	+	if inDeserialized[0] is not None:
	+	print "This does not seem like multisig spending transaction, input script is expected to start with OP_FALSE, but proceeding anyway"
	+
	+	sigs = inDeserialized[1:-1]
	+	mscript = inDeserialized[-1]
	+
	+	mDeserialized = deserialize_script(mscript)
	+
	+	if mDeserialized[-1] != 0xae:
	+	print "Last instruction of redeem script is not 0xAE, but proceeding anyway"
	+
	+	sigCount = mDeserialized[0]
	+	pubCount = mDeserialized[-2]
	+	pubKeys = mDeserialized[1:-2]
	+
	+	assert isinstance(sigCount, int)
	+	assert isinstance(pubCount, int)
	+
	+	print "We have %d-out-ouf-%d scheme" % (sigCount, pubCount)
	+
	+	assert len(sigs) == sigCount, "Signature count does not match reedem script sig count"
	+	assert len(pubKeys) == pubCount, "Pubkey count does not match count of pubkeys in redeem script"
	+
	+	#let's bruteforce each sig against each pubkey even though in reality there must be certain order
	+	for sig in sigs:
	+	for pub in pubKeys:
	+	#print "Testing sig %s against pub %s" % (sig, pub)
	+	if verify_tx_input(tx, 0, mscript, sig, pub):
	+	print "Match: pubkey %s matched signature %s" % (pub, sig)
	+	</code>