# Correction 1

John White, has discovered a flaw in the descriptions above.
This flaw is caused by the `extensions` attribute:

>     tx = {'ref_block_num': 36029,
>           'ref_block_prefix': 1164960351,
>           'expiration': '2016-08-08T12:24:17',
>           'operations': [['vote',
>                           {'author': 'xeroc',
>                            'permlink': 'piston',
>                            'voter': 'xeroc',
>                            'weight': 10000}]],
>           'extensions': [],
>           'signatures': [],
>           }

In the OP, we did **not** serialize this extensions such that our
serialized sequence was too short. Since we do not make use of
extensions here, and the serialization is a length-prefixed array,
we can fix the flaw by simply appending `0x00` to the serialization

        buf += (varint(len([]))

Everything else should stay the same.