def check_sign(self, blinded_tx: CTransaction, signed_tx: CTransaction,
bundle: Dict[str, Any]) -> None:
tx_to_sign = blinded_tx.to_mutable()
for n, vin in enumerate(tx_to_sign.vin):
utxo = bundle['vin_utxo'][n]
amount = -1 if utxo['amount'] == -1 else coins_to_satoshi(
utxo['amount'])
scriptPubKey = CScript(x(utxo['scriptPubKey']))
a = CCoinAddress(utxo['address'])
if 'privkey' in utxo:
privkey = CCoinKey(utxo['privkey'])
assert isinstance(a, P2PKHCoinAddress),\
"only P2PKH is supported for single-sig"
assert a == P2PKHElementsAddress.from_pubkey(privkey.pub)
assert scriptPubKey == a.to_scriptPubKey()
sighash = SignatureHash(scriptPubKey,
tx_to_sign,
n,
SIGHASH_ALL,
amount=amount,
sigversion=SIGVERSION_BASE)
sig = privkey.sign(sighash) + bytes([SIGHASH_ALL])
tx_to_sign.vin[n].scriptSig = CScript(
[CScript(sig), CScript(privkey.pub)])
else:
pk_list = [CCoinKey(pk) for pk in utxo['privkey_list']]
redeem_script_data = [utxo['num_p2sh_participants']]
redeem_script_data.extend([pk.pub for pk in pk_list])
redeem_script_data.extend([len(pk_list), OP_CHECKMULTISIG])
redeem_script = CScript(redeem_script_data)
assert isinstance(a, P2SHCoinAddress),\
"only P2SH is supported for multi-sig."
assert scriptPubKey == redeem_script.to_p2sh_scriptPubKey()
assert a == P2SHElementsAddress.from_scriptPubKey(
redeem_script.to_p2sh_scriptPubKey())
sighash = SignatureHash(redeem_script,
tx_to_sign,
n,
SIGHASH_ALL,
amount=amount,
sigversion=SIGVERSION_BASE)
sigs = [
pk.sign(sighash) + bytes([SIGHASH_ALL]) for pk in pk_list
]
tx_to_sign.vin[n].scriptSig = CScript([b''] + sigs +
[redeem_script])
VerifyScript(tx_to_sign.vin[n].scriptSig,
scriptPubKey,
tx_to_sign,
n,
amount=amount)
self.assertEqual(tx_to_sign.serialize(), signed_tx.serialize())
def find_utxo_for_fee(say, die, rpc):
"""Find suitable utxo to pay the fee.
Retrieve thekey to spend this utxo and add it to
the returned dict."""
# Find utxo to use for fee. In our simple example, only Alice pays the fee.
# To be on a safe side, include only transactions
# that are confirmed (1 as 'minconf' argument of listunspent)
# and safe to spend (False as 'include_unsafe' # argument of listunspent)
say('Searching for utxo for fee asset')
utxo_list = rpc.listunspent(1, 9999999, [], False,
{'asset': fee_asset.to_hex()})
utxo_list.sort(key=lambda u: u['amount'])
for utxo in utxo_list:
# To not deal with possibility of dust outputs,
# just require fee utxo to be big enough
if coins_to_satoshi(utxo['amount']) >= FIXED_FEE_SATOSHI * 2:
utxo['key'] = CCoinKey(rpc.dumpprivkey(utxo['address']))
if 'assetcommitment' not in utxo:
# If UTXO is not blinded, Elements daemon will not
# give us assetcommitment, so we need to generate it ourselves.
asset = CAsset(lx(utxo['asset']))
utxo['assetcommitment'] = b2x(asset.to_commitment())
return utxo
else:
die('Cannot find utxo for fee that is >= {} satoshi'.format(
FIXED_FEE_SATOSHI * 2))
def issue_asset(say, asset_amount, rpc):
"""Issue asset and return CAsset instance and utxo to spend"""
say('Issuing my own new asset, amount: {}'.format(asset_amount))
# No reissuance, so we specify tokenamount as 0
issue = rpc.issueasset(asset_amount, 0)
asset_str = issue['asset']
say('The asset is {}'.format(asset_str))
say('Getting unspent utxo for asset {}'.format(asset_str))
# There should be only one utxo for newly-issued asset, we can use
# destructuring assignment to get the first element of resulting list.
# Utxo should be unconfirmed yet, so we specify 0 for minconf and maxconf.
(asset_utxo, ) = rpc.listunspent(0, 0, [], False, {'asset': asset_str})
say('Unspent utxo for asset {} is {}:{}'.format(asset_str,
asset_utxo['txid'],
asset_utxo['vout']))
say("Retrieving private key to spend UTXO (source address {})".format(
asset_utxo['address']))
# Retrieve key to spend the UTXO and add it to asset_utxo dict
asset_utxo['key'] = CCoinKey(rpc.dumpprivkey(asset_utxo['address']))
return asset_str, asset_utxo
def print_verbose(signature, key, msg):
secret = CCoinKey(key)
address = P2PKHCoinAddress.from_pubkey(secret.pub)
message = BitcoinMessage(msg)
print('Address: %s' % address)
print('Message: %s' % msg)
print('Signature: %s' % signature)
print('Verified: %s' % VerifyMessage(address, message, signature))
print('\nTo verify using bitcoin core:')
print('\n`bitcoin-cli verifymessage %s \'%s\' \'%s\'`\n' %
(address, signature.decode('ascii'), msg))
def get_dst_addr(say, rpc):
"""Generate an address and retrieve blinding key for it"""
# Note that we could generate our own keys, and make
# addresses from them, and then derive the blinding keys,
# but then we would have to decide how to store the keys
# for the user to be able to do own exploration
# after example finishes working. We choose the easiest path.
#
# Note that if we have master blinding key
# (Elements will include master blinding key in wallet dump
# in future versions), we could derive the blinding key
# from the master key and the address, with this code:
# addr.to_scriptPubKey().derive_blinding_key(blinding_derivation_key)
# derive_blinding_key() follows the logic of blinding key
# derivation in Elements Core source.
if say:
say('Generating new address and retrieving blinding key for it')
addr_str = rpc.getnewaddress()
# Retrieve the blinding key
blinding_key = CCoinKey.from_secret_bytes(x(rpc.dumpblindingkey(addr_str)))
return CCoinAddress(addr_str), blinding_key
def test(self) -> None:
xpriv1 = CCoinExtKey(
'xprv9s21ZrQH143K4TFwadu5VoGfAChTWXUw49YyTWE8SRqC9ZC9AQpHspzgbAcScTmC4MURiMT7pmCbci5oKbWijJmARiUeRiLXYehCtsoVdYf'
)
xpriv2 = CCoinExtKey(
'xprv9uZ4jKNZFfGEQTTunEuy2cLQMckzuy5saCmiKuxYJgHX5pGFCx3KQ8mTkSfuLNaWGNQ9LKCg5YzUihxoQv493ErnkcaS3q1udx9X8WZbwZc'
)
priv1 = CCoinKey(
'L27zAtDgjDC34sG5ZSey1wvdZ9JyZsNnvZEwbbZYWUYXXQtgri5R')
xpub1 = CCoinExtPubKey(
'xpub69b6hm71WMe1PGpgUmaDPkbxYoTzpmswX8KGeinv7SPRcKT22RdMM4416kqtEUuXqXCAi7oGx7tHwCRTd3JHatE3WX1Zms6Lgj5mrbFyuro'
)
xpub1.assign_derivation_info(
KeyDerivationInfo(xpub1.parent_fp, BIP32Path('m/0')))
pub1 = CPubKey(
x('03b0fe9cfc88fed9fcecf9dcb7bb5c90dd1a4500f4cfc5c854ffc8e54d639d6bc5'
))
kstore = KeyStore(
external_privkey_lookup=(lambda key_id, dinfo: priv1
if key_id == priv1.pub.key_id else None),
external_pubkey_lookup=(lambda key_id, dinfo: pub1
if key_id == pub1.key_id else None))
self.assertEqual(kstore.get_privkey(priv1.pub.key_id), priv1)
self.assertEqual(kstore.get_pubkey(pub1.key_id), pub1)
self.assertEqual(kstore.get_pubkey(priv1.pub.key_id), priv1.pub)
kstore = KeyStore(xpriv1,
priv1,
xpub1,
pub1,
require_path_templates=False)
self.assertEqual(kstore.get_privkey(priv1.pub.key_id), priv1)
self.assertEqual(kstore.get_pubkey(priv1.pub.key_id), priv1.pub)
self.assertEqual(kstore.get_pubkey(pub1.key_id), pub1)
# check that no-derivation lookup for (priv, pub) of extended keys
# does not return anything if derivation is not supplied,
# but returns pubkey when empty path is supplied
self.assertEqual(kstore.get_privkey(xpriv1.pub.key_id), None)
self.assertEqual(
kstore.get_privkey(
xpriv1.pub.key_id,
KeyDerivationInfo(xpriv1.fingerprint, BIP32Path("m"))),
xpriv1.priv)
self.assertEqual(kstore.get_pubkey(xpriv1.pub.key_id), None)
self.assertEqual(
kstore.get_pubkey(
xpriv1.pub.key_id,
KeyDerivationInfo(xpriv1.fingerprint, BIP32Path("m"))),
xpriv1.pub)
# can't find xpub1's pub without derivation
self.assertEqual(kstore.get_pubkey(xpub1.pub.key_id), None)
# can find with correct derivation info supplied
self.assertEqual(
kstore.get_pubkey(
xpub1.pub.key_id,
KeyDerivationInfo(xpub1.parent_fp, BIP32Path("m/0"))),
xpub1.pub)
# but not with incorrect derivation info
self.assertEqual(
kstore.get_pubkey(
xpub1.pub.key_id,
KeyDerivationInfo(xpub1.parent_fp, BIP32Path("m"))), None)
# check longer derivations
self.assertEqual(
kstore.get_privkey(xpriv1.derive_path("0'/1'/2'").pub.key_id),
None)
self.assertEqual(
kstore.get_privkey(
xpriv1.derive_path("0'/1'/2'").pub.key_id,
KeyDerivationInfo(xpriv1.fingerprint,
BIP32Path("m/0'/1'/2'"))),
xpriv1.derive_path("0'/1'/2'").priv)
self.assertEqual(
kstore.get_pubkey(
xpriv1.derive_path("0'/1'/2'").pub.key_id,
KeyDerivationInfo(xpriv1.fingerprint,
BIP32Path("m/0'/1'/2'"))),
xpriv1.derive_path("0'/1'/2'").pub)
self.assertEqual(
kstore.get_pubkey(
xpub1.derive_path("0/1/2").pub.key_id,
KeyDerivationInfo(xpub1.parent_fp, BIP32Path('m/0/0/1/2'))),
xpub1.derive_path("0/1/2").pub)
path = BIP32Path("0'/1'/2'")
derived_xpub = xpriv2.derive_path(path).neuter()
derived_pub = derived_xpub.derive_path('3/4/5').pub
self.assertEqual(kstore.get_pubkey(derived_pub.key_id), None)
kstore.add_key(derived_xpub)
self.assertEqual(
kstore.get_pubkey(
derived_pub.key_id,
KeyDerivationInfo(xpriv2.parent_fp,
BIP32Path("m/0/0'/1'/2'/3/4/5"))),
derived_pub)
kstore.add_key(xpriv2)
derived_pub = xpriv2.derive_path('3h/4h/5h').pub
self.assertEqual(
kstore.get_pubkey(
derived_pub.key_id,
KeyDerivationInfo(xpriv2.parent_fp,
BIP32Path("m/0/3'/4'/5'"))), derived_pub)
derived_priv = xpriv2.derive_path('3h/4h/5h').priv
self.assertEqual(
kstore.get_privkey(
derived_priv.pub.key_id,
KeyDerivationInfo(xpriv2.parent_fp,
BIP32Path("m/0/3'/4'/5'"))), derived_priv)
# check that .remove_key() works
kstore.remove_key(xpriv1)
kstore.remove_key(xpub1)
kstore.remove_key(priv1)
kstore.remove_key(pub1)
self.assertEqual(kstore.get_privkey(priv1.pub.key_id), None)
self.assertEqual(kstore.get_pubkey(pub1.key_id), None)
self.assertEqual(
kstore.get_privkey(
xpriv1.derive_path("0'/1'/2'").pub.key_id,
KeyDerivationInfo(xpriv1.fingerprint,
BIP32Path("m/0'/1'/2'"))), None)
self.assertEqual(
kstore.get_pubkey(xpub1.derive_path("0/1/2").pub.key_id), None)
def test_path_template_enforcement(self) -> None:
xpriv1 = CCoinExtKey(
'xprv9s21ZrQH143K4TFwadu5VoGfAChTWXUw49YyTWE8SRqC9ZC9AQpHspzgbAcScTmC4MURiMT7pmCbci5oKbWijJmARiUeRiLXYehCtsoVdYf'
)
xpriv2 = CCoinExtKey(
'xprv9s21ZrQH143K3QgBvK4tkeHuvuWc6KETTTcgGQ4NmW7g16AtCPV4hZpujiimpLM9ivFPgsMdNNVuVUnDwChutxczNKYHzP1Mo5HuqG7CNYv'
)
assert xpriv2.derivation_info
assert len(xpriv2.derivation_info.path) == 0
priv1 = CCoinKey(
'L27zAtDgjDC34sG5ZSey1wvdZ9JyZsNnvZEwbbZYWUYXXQtgri5R')
xpub1 = CCoinExtPubKey(
'xpub69b6hm71WMe1PGpgUmaDPkbxYoTzpmswX8KGeinv7SPRcKT22RdMM4416kqtEUuXqXCAi7oGx7tHwCRTd3JHatE3WX1Zms6Lgj5mrbFyuro'
)
xpub2 = xpriv2.derive(333).neuter()
xpub1.assign_derivation_info(
KeyDerivationInfo(xpub1.parent_fp, BIP32Path('m/0')))
pub1 = CPubKey(
x('03b0fe9cfc88fed9fcecf9dcb7bb5c90dd1a4500f4cfc5c854ffc8e54d639d6bc5'
))
xpub3 = xpub1.derive(0)
xpub3.assign_derivation_info(
KeyDerivationInfo(x('abcdef10'), BIP32Path('m/0/0')))
# No error when require_path_templates is not set
KeyStore(xpriv1,
xpriv2,
priv1,
xpub1,
pub1,
require_path_templates=False)
with self.assertRaisesRegex(ValueError,
'only make sense for extended keys'):
KeyStore((priv1, BIP32PathTemplate(''))) # type: ignore
with self.assertRaisesRegex(ValueError,
'only make sense for extended keys'):
KeyStore((pub1, [BIP32PathTemplate('')])) # type: ignore
with self.assertRaisesRegex(ValueError,
'path templates must be specified'):
KeyStore(xpriv1)
with self.assertRaisesRegex(ValueError,
'path templates must be specified'):
KeyStore(xpub1)
# same but via add_key
ks = KeyStore()
with self.assertRaisesRegex(ValueError,
'only make sense for extended keys'):
ks.add_key((priv1, BIP32PathTemplate(''))) # type: ignore
with self.assertRaisesRegex(ValueError,
'only make sense for extended keys'):
ks.add_key((pub1, [BIP32PathTemplate('')])) # type: ignore
with self.assertRaisesRegex(ValueError,
'path templates list is empty'):
ks.add_key((pub1, [])) # type: ignore
with self.assertRaisesRegex(ValueError,
'only make sense for extended keys'):
ks.add_key((pub1, '')) # type: ignore
with self.assertRaisesRegex(ValueError,
'index template format is not valid'):
ks.add_key((xpub1, 'abc')) # type: ignore
with self.assertRaisesRegex(TypeError,
'is expected to be an instance of '):
ks.add_key((xpub1, [10])) # type: ignore
with self.assertRaisesRegex(ValueError,
'path templates must be specified'):
ks.add_key(xpriv1)
with self.assertRaisesRegex(ValueError,
'path templates must be specified'):
ks.add_key(xpub1)
# No error when path templates are specified for extended keys
ks = KeyStore(
(xpriv1, BIP32PathTemplate('m')),
(xpriv2, 'm/[44,49,84]h/0h/0h/[0-1]/*'),
(xpub1, ''), # '' same as BIP32PathTemplate('')
(xpub2, ['0/1', 'm/333/3/33']),
(xpub3, BIP32PathTemplate('m/0/0/1')),
priv1,
pub1)
self.assertEqual(ks.get_privkey(priv1.pub.key_id), priv1)
self.assertEqual(ks.get_pubkey(pub1.key_id), pub1)
# still can find non-extended priv even if derivation info is
# specified, because there's exact match.
self.assertEqual(
ks.get_privkey(priv1.pub.key_id,
KeyDerivationInfo(xpriv1.parent_fp,
BIP32Path("m"))), priv1)
self.assertEqual(ks.get_pubkey(pub1.key_id), pub1)
# can't find without derivation specified
self.assertEqual(ks.get_privkey(xpriv1.pub.key_id), None)
# but can find with derivation specified
self.assertEqual(
ks.get_privkey(
xpriv1.pub.key_id,
KeyDerivationInfo(xpriv1.fingerprint, BIP32Path('m'))),
xpriv1.priv)
# can't find without derivation specified
self.assertEqual(ks.get_pubkey(xpub1.pub.key_id), None)
# can find with derivation specified
self.assertEqual(
ks.get_pubkey(xpub1.pub.key_id,
KeyDerivationInfo(xpub1.parent_fp,
BIP32Path('m/0'))), xpub1.pub)
# exception when derivation goes beyond template
with self.assertRaises(BIP32PathTemplateViolation):
ks.get_pubkey(
xpub1.derive(1).pub.key_id,
KeyDerivationInfo(xpub1.parent_fp, BIP32Path('m/0/1')))
# success when template allows
self.assertEqual(
ks.get_pubkey(
xpub3.derive(1).pub.key_id,
KeyDerivationInfo(x('abcdef10'), BIP32Path('m/0/0/1'))),
xpub3.derive(1).pub)
# fails when template not allows
with self.assertRaises(BIP32PathTemplateViolation):
ks.get_pubkey(
xpub3.derive(2).pub.key_id,
KeyDerivationInfo(x('abcdef10'), BIP32Path('m/0/0/2')))
long_path = BIP32Path(
"m/43435/646/5677/5892/58885/2774/9943/75532/8888")
with self.assertRaises(BIP32PathTemplateViolation):
ks.get_privkey(
xpriv2.derive_path(long_path).pub.key_id,
KeyDerivationInfo(xpriv2.fingerprint, long_path))
with self.assertRaises(BIP32PathTemplateViolation):
ks.get_privkey(
xpriv2.derive_path("44'/0'/0'/3/25").pub.key_id,
KeyDerivationInfo(xpriv2.fingerprint,
BIP32Path('m/44h/0h/0h/3/25')))
with self.assertRaises(BIP32PathTemplateViolation):
ks.get_privkey(
xpriv2.derive_path("44'/0'/0'/0/1'").pub.key_id,
KeyDerivationInfo(xpriv2.fingerprint,
BIP32Path('m/44h/0h/0h/0/1h')))
self.assertEqual(
ks.get_privkey(
xpriv2.derive_path("44'/0'/0'/1/25").pub.key_id,
KeyDerivationInfo(xpriv2.fingerprint,
BIP32Path('m/44h/0h/0h/1/25'))),
xpriv2.derive_path("44'/0'/0'/1/25").priv)
with self.assertRaises(BIP32PathTemplateViolation):
ks.get_pubkey(
xpub2.derive_path('0').pub.key_id,
KeyDerivationInfo(xpub2.parent_fp, BIP32Path('m/333/0')))
with self.assertRaises(BIP32PathTemplateViolation):
ks.get_pubkey(
xpub2.derive_path('3/34').pub.key_id,
KeyDerivationInfo(xpub2.parent_fp, BIP32Path('m/333/3/34')))
self.assertEqual(
ks.get_pubkey(
xpub2.derive_path('3/33').pub.key_id,
KeyDerivationInfo(xpub2.parent_fp, BIP32Path('m/333/3/33'))),
xpub2.derive_path('3/33').pub)
xpub49 = xpriv2.derive_path("m/49'/0'/0'/0").neuter()
with self.assertRaisesRegex(ValueError, 'must specify full path'):
ks = KeyStore(
xpriv2,
xpub49,
default_path_template='[44,49,84]h/0h/0h/[0-1]/[0-50000]')
ks = KeyStore(
xpriv2,
xpub49,
default_path_template='m/[44,49,84]h/0h/0h/[0-1]/[0-50000]')
with self.assertRaises(BIP32PathTemplateViolation):
ks.get_privkey(
xpriv2.derive_path(long_path).pub.key_id,
KeyDerivationInfo(xpriv2.fingerprint, long_path))
with self.assertRaises(BIP32PathTemplateViolation):
ks.get_privkey(
xpriv2.derive_path("44'/0'/0'/1/50001").pub.key_id,
KeyDerivationInfo(xpriv2.fingerprint,
BIP32Path('m/44h/0h/0h/1/50001')))
self.assertEqual(
ks.get_privkey(
xpriv2.derive_path("44'/0'/0'/1/25").pub.key_id,
KeyDerivationInfo(xpriv2.fingerprint,
BIP32Path('m/44h/0h/0h/1/25'))),
xpriv2.derive_path("44'/0'/0'/1/25").priv)
with self.assertRaises(BIP32PathTemplateViolation):
ks.get_pubkey(
xpub49.derive_path('50001').pub.key_id,
KeyDerivationInfo(xpriv2.fingerprint,
BIP32Path('m/49h/0h/0h/0/50001')))
with self.assertRaises(BIP32PathTemplateViolation):
ks.get_pubkey(
xpub49.derive_path('50000/3').pub.key_id,
KeyDerivationInfo(xpriv2.fingerprint,
BIP32Path('m/49h/0h/0h/0/50000/3')))
self.assertEqual(
ks.get_pubkey(
xpub49.derive_path('50000').pub.key_id,
KeyDerivationInfo(xpriv2.fingerprint,
BIP32Path('m/49h/0h/0h/0/50000'))),
xpub49.derive_path('50000').pub)
f = sys.argv[1]
#with open(sys.argv[1]) as f:
# We could use CTransaction here, but if we want to
# use mypy to do static checking, we need to use the elements-specific
# classes. mypy does cannot know about dynamic class dispatch.
#tx = CElementsTransaction.deserialize(x(f.readline().rstrip())) [16/1870]
tx = CElementsTransaction.deserialize(x(f))
# Read in the blinding key, expected to be in WIF format.
f = sys.argv[2]
#with open(sys.argv[2]) as f:
#bkey = CCoinKey.from_secret_bytes(x(f.readline().rstrip()))
bkey = CCoinKey.from_secret_bytes(x(f))
# Iterate through transaction ouptputs, and unblind what we can.
print("")
for n, vout in enumerate(tx.vout):
# Note that nValue of vout in Elements is not a simple int,
# but CConfidentialValue, which can either be explicit, and can be
# converted to satoshis with to_amount(), or it can be blinded, in
# which case you need to unblind the output to know its value.
if vout.nValue.is_explicit():
# The output is not blinded, we can access the values right away
assert vout.nAsset.is_explicit(), "unblinding just the asset is not supported"
if vout.is_fee():
print("vout {}: fee".format(n))
else:
path_template = None
require_path_templates = True
if args.path_template is not None:
if args.without_path_template_checks:
print('--without-path-template-checks conflicts with '
'--path-template argument')
sys.exit(-1)
path_template = BIP32PathTemplate(args.path_template)
elif args.without_path_template_checks:
require_path_templates = False
keys = []
for key_index, key_data in enumerate(args.key or []):
k: Optional[Union[CCoinKey, CCoinExtKey]] = None
try:
k = CCoinKey(key_data)
except (ValueError, Base58Error):
pass
try:
k = CCoinExtKey(key_data)
except (ValueError, Base58Error):
pass
if k is None:
print(f'key at position {key_index} is not in recognized format')
sys.exit(-1)
keys.append(k)
psbt = PartiallySignedTransaction.from_base64_or_binary(psbt_data)
sign_result = psbt.sign(KeyStore.from_iterable(
sys.exit(-1)
# Switch the chain parameters to Elements
select_chain_params('elements')
# Read in and decode the blinded transaction.
# expected to be hex-encoded as one line.
with open(sys.argv[1]) as f:
# We could use CTransaction here, but if we want to
# use mypy to do static checking, we need to use the elements-specific
# classes. mypy does cannot know about dynamic class dispatch.
input_tx = CElementsTransaction.deserialize(x(f.readline().rstrip()))
# Read in the key, expected to be in WIF format.
with open(sys.argv[2]) as f:
key = CCoinKey(f.readline().rstrip())
# Read in the unblinding key, expected to be in HEX format.
with open(sys.argv[3]) as f:
bkey = CCoinKey.from_secret_bytes(x(f.readline().rstrip()))
dst_addr = CElementsAddress(sys.argv[4])
# Construct P2SH_P2WPKH address from the loaded key
spk = CScript([0, Hash160(key.pub)]).to_p2sh_scriptPubKey()
src_addr = P2SHCoinAddress.from_scriptPubKey(spk)
sys.stderr.write(
'\nSearching for ouptut with address {}\n'.format(src_addr))
utxo = None
def sign_message(key, msg):
secret = CCoinKey(key)
message = BitcoinMessage(msg)
return SignMessage(secret, message)
def sign_message(key: str, msg: str) -> bytes:
secret = CCoinKey(key)
message = BitcoinMessage(msg)
return SignMessage(secret, message)
sys.exit(-1)
# Switch the chain parameters to Elements
select_chain_params('elements')
# Read in and decode the blinded transaction.
# expected to be hex-encoded as one line.
with open(sys.argv[1]) as f:
# We could use CTransaction here, but if we want to
# use mypy to do static checking, we need to use the elements-specific
# classes. mypy does cannot know about dynamic class dispatch.
tx = CElementsTransaction.deserialize(x(f.readline().rstrip()))
# Read in the blinding key, expected to be in WIF format.
with open(sys.argv[2]) as f:
bkey = CCoinKey.from_secret_bytes(x(f.readline().rstrip()))
# Iterate through transaction ouptputs, and unblind what we can.
print("")
for n, vout in enumerate(tx.vout):
# Note that nValue of vout in Elements is not a simple int,
# but CConfidentialValue, which can either be explicit, and can be
# converted to satoshis with to_amount(), or it can be blinded, in
# which case you need to unblind the output to know its value.
if vout.nValue.is_explicit():
# The output is not blinded, we can access the values right away
assert vout.nAsset.is_explicit(
), "unblinding just the asset is not supported"
if vout.is_fee():
print("vout {}: fee".format(n))
else:
elif args.verbosity >= 1:
logging.root.setLevel(logging.DEBUG)
elif args.verbosity == -1:
logging.root.setLevel(logging.WARNING)
elif args.verbosity <= -2:
logging.root.setLevel(logging.ERROR)
if args.testnet:
bitcointx.select_chain_params('bitcoin/testnet')
elif args.regtest:
bitcointx.select_chain_params('bitcoin/regtest')
rpc = bitcointx.rpc.RPCCaller(allow_default_conf=True)
if args.privkey is None:
args.privkey = CCoinKey.from_secret_bytes(os.urandom(32))
else:
args.privkey = CCoinKey(args.privkey)
logging.info('Using keypair %s %s' % (b2x(args.privkey.pub), args.privkey))
# Turn the text file into padded lines
if args.fd is sys.stdin:
# work around a bug where even though we specified binary encoding we get
# the sys.stdin instead.
args.fd = sys.stdin.buffer
raw_padded_lines = [
b'\x00' + line.rstrip().ljust(args.min_len) + b'\x00'
for line in args.fd.readlines()
]