X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=lightning%2Fsrc%2Fsign%2Fmod.rs;h=9b5efee4b9695cc10a3df1cef99e4d4328dc05b1;hb=cd4cc203a2bbb716c8747bd45ac84e42b8f53b84;hp=1459151de1c043964d80d77ca4403fa92f6211aa;hpb=d8021c7891ca039751b250511fbcc06da32e9e7e;p=rust-lightning

diff --git a/lightning/src/sign/mod.rs b/lightning/src/sign/mod.rs
index 1459151d..9b5efee4 100644
--- a/lightning/src/sign/mod.rs
+++ b/lightning/src/sign/mod.rs
@@ -904,6 +904,17 @@ pub trait SignerProvider {
 	fn get_shutdown_scriptpubkey(&self) -> Result<ShutdownScript, ()>;
 }
 
+/// A helper trait that describes an on-chain wallet capable of returning a (change) destination
+/// script.
+pub trait ChangeDestinationSource {
+	/// Returns a script pubkey which can be used as a change destination for
+	/// [`OutputSpender::spend_spendable_outputs`].
+	///
+	/// This method should return a different value each time it is called, to avoid linking
+	/// on-chain funds controlled to the same user.
+	fn get_change_destination_script(&self) -> Result<ScriptBuf, ()>;
+}
+
 /// A simple implementation of [`WriteableEcdsaChannelSigner`] that just keeps the private keys in memory.
 ///
 /// This implementation performs no policy checks and is insufficient by itself as