def METHOD_NAME(vk: str):
    assert vk is not None, 'No VK provided.'
    assert type(vk) == str, 'VK not a string.'
    assert len(vk) == 64, 'VK is not 64 characters.'
    # assert vk == ctx.signer, 'Signer has to be the one voting to remove themselves.'
    int(vk, 16)