+ /// The key tweak corresponding to the number of the commitment transaction in which the HTLC
+ /// output lives. This tweak is applied to all the basepoints for both parties in the channel to
+ /// arrive at unique keys per commitment.
+ ///
+ /// See <https://github.com/lightning/bolts/blob/master/03-transactions.md#keys> for more info.
+ pub per_commitment_point: PublicKey,