pub fn create_chan_between_nodes<'a, 'b, 'c, 'd>(
    node_a: &'a Node<'b, 'c, 'd>,
    node_b: &'a Node<'b, 'c, 'd>,
) -> (ChannelAnnouncement, ChannelUpdate, ChannelUpdate, ChannelId, Transaction)
where 'c: 'd,