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taproot_output_script: first returned byte should be OP_1 (0x51)

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If we look at

  def IsPayToTaproot(script):
      return len(script) == 35 and script[0] == OP_1 and script[1] == 33 and script[2] >= 0 and script[2] <= 1

First byte is is checked for OP_1. OP_1 is 0x51

But the example code in this BIP returns  

`bytes([0x01, 0x21, output_pubkey[0] & 1]) + output_pubkey[1:]`

First byte 0x01, but it should be 0x51
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Dmitry Petukhov 2019-05-10 03:09:54 +05:00 • committed by GitHub
parent 27e61d61e6
commit 0c49346c87
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bip-taproot.mediawiki
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@ -203,7 +203,7 @@ def taproot_output_script(internal_pubkey, script_tree):
t = tagged_hash("TapTweak", internal_pubkey.get_bytes() + h)
assert int.from_bytes(t, 'big') < SECP256K1_ORDER
output_pubkey = internal_pubkey.tweak_add(t).get_bytes()
return bytes([0x01, 0x21, output_pubkey[0] & 1]) + output_pubkey[1:]
return bytes([0x51, 0x21, output_pubkey[0] & 1]) + output_pubkey[1:]
</source>
The function <code>taproot_output_script</code> returns a byte array with the scriptPubKey. It can be P2SH wrapped if desired (see BIP141).