he hw signer's public blinding key also.

Parameters
----------
script : bytes
    The script for which the blinding nonce is required.

their_pubkey : 33-bytes
    The counterparty public key.

include_pubkey : bool, optional
    Whether to also return the wallet's public blinding key.
    Defaults to False.

multisig_name : str, optional
    The name of any registered multisig wallet for which to fetch the blinding nonce.
    Defaults to None

Returns
-------
1. include_pubkey is False
33-bytes
    Public blinding nonce for the passed script and counterparty public key.

2. include_pubkey is True
dict
    Contains keys:
    shared_nonce - 32-bytes, public blinding nonce for the passed script as above.
    blinding_key - 33-bytes, public blinding key for the passed script.
)