def hashX_from_script(cls, script):
'''Returns a hashX from a script, or None if the script is provably
unspendable so the output can be dropped.
'''
if script and script[0] == OpCodes.OP_RETURN:
return None
# BTN: make p2pk and p2pkh the same hashX
if len(script) == 35 and script[0] == 0x21 and script[-1] == OpCodes.OP_CHECKSIG:
pubkey = script[1:-1]
script = ScriptPubKey.P2PKH_script(hash160(pubkey))
return sha256(script).digest()[:HASHX_LEN]
def pay_to_address_script(cls, address):
'''Return a pubkey script that pays to a pubkey hash.
Pass the address (either P2PKH or P2SH) in base58 form.
'''
raw = Base58.decode_check(address)
# Require version byte plus hash160.
verbyte = -1
if len(raw) == 21:
verbyte, hash_bytes = raw[0], raw[1:]
if verbyte == cls.P2PKH_VERBYTE:
return ScriptPubKey.P2PKH_script(hash_bytes)
if verbyte == cls.P2SH_VERBYTE:
return ScriptPubKey.P2SH_script(hash_bytes)
raise CoinError('invalid address: {}'.format(address))
def pay_to_address_script(cls, address):
'''Return a pubkey script that pays to a pubkey hash.
Pass the address (either P2PKH or P2SH) in base58 form.
'''
raw = cls.DECODE_CHECK(address)
# Require version byte(s) plus hash160.
verbyte = -1
verlen = len(raw) - 20
if verlen > 0:
verbyte, hash_bytes = raw[:verlen], raw[verlen:]
if verbyte == cls.P2PKH_VERBYTE:
return ScriptPubKey.P2PKH_script(hash_bytes)
if verbyte in cls.P2SH_VERBYTES:
return ScriptPubKey.P2SH_script(hash_bytes)
raise CoinError('invalid address: {}'.format(address))
def pay_to_address_script(cls, address):
'''Return a pubkey script that pays to a pubkey hash.
Pass the address (either P2PKH or P2SH) in base58 form.
'''
#比特币地址格式为base58(version(1byte)+hash(20bytes)+checksum(4bytes))
#这里decode_check会对比特币地址解码后，校验最后四字节，然后去掉四字节，返回21字节的地址数据
raw = Base58.decode_check(address)
# Require version byte(s) plus hash160.
verbyte = -1
verlen = len(raw) - 20
if verlen > 0:
verbyte, hash_bytes = raw[:verlen], raw[verlen:]
if verbyte == cls.P2PKH_VERBYTE:
return ScriptPubKey.P2PKH_script(hash_bytes)
if verbyte in cls.P2SH_VERBYTES:
return ScriptPubKey.P2SH_script(hash_bytes)
raise CoinError('invalid address: {}'.format(address))
