+/// The unblinded node in a [`BlindedPath`].
+#[derive(Clone, Debug, Hash, PartialEq, Eq)]
+pub enum IntroductionNode {
+ /// The node id of the introduction node.
+ NodeId(PublicKey),
+ /// The short channel id of the channel leading to the introduction node. The [`Direction`]
+ /// identifies which side of the channel is the introduction node.
+ DirectedShortChannelId(Direction, u64),
+}
+
+/// The side of a channel that is the [`IntroductionNode`] in a [`BlindedPath`]. [BOLT 7] defines
+/// which nodes is which in the [`ChannelAnnouncement`] message.
+///
+/// [BOLT 7]: https://github.com/lightning/bolts/blob/master/07-routing-gossip.md#the-channel_announcement-message
+/// [`ChannelAnnouncement`]: crate::ln::msgs::ChannelAnnouncement
+#[derive(Clone, Debug, Hash, PartialEq, Eq)]
+pub enum Direction {
+ /// The lesser node id when compared lexicographically in ascending order.
+ NodeOne,
+ /// The greater node id when compared lexicographically in ascending order.
+ NodeTwo,
+}
+