Use my own fork of rust-miniscript

It supports multipath descriptors. We'll need to find a solution for the release

Cargo.lock

@@ -256,8 +256,7 @@ dependencies = [
 [[package]]
 name = "miniscript"
 version = "8.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7f4975078076f0b7b914a3044ad7432d2a7fcec38edb855afdc672e24ca35b69"
+source = "git+https://github.com/darosior/rust-miniscript?branch=multipath_descriptors_on_8.0#7d756f2ab066d85d299f711f953ebda15f14e832"
 dependencies = [
  "bitcoin",
  "serde",

Cargo.toml

@@ -25,7 +25,8 @@ jsonrpc_server = []
 
 [dependencies]
 # For managing transactions (it re-exports the bitcoin crate)
-miniscript = { version = "8.0", features = ["serde"] }
+# TODO: don't use my fork for a real release..
+miniscript = { git = "https://github.com/darosior/rust-miniscript", branch = "multipath_descriptors_on_8.0", features = ["serde"] }
 
 # Don't reinvent the wheel
 dirs = "3.0"

src/descriptors.rs

@@ -125,6 +125,10 @@ impl MiniscriptKey for DerivedPublicKey {
     fn is_x_only_key(&self) -> bool {
         false
     }
+
+    fn num_der_paths(&self) -> usize {
+        0
+    }
 }
 
 impl ToPublicKey for DerivedPublicKey {
@@ -164,7 +168,8 @@ fn csv_check(csv_value: u32) -> Result<(), DescCreationError> {
 
 fn is_unhardened_deriv(key: &descriptor::DescriptorPublicKey) -> bool {
     match *key {
-        descriptor::DescriptorPublicKey::Single(..) => false,
+        descriptor::DescriptorPublicKey::Single(..)
+        | descriptor::DescriptorPublicKey::MultiXPub(..) => false,
         descriptor::DescriptorPublicKey::XPub(ref xpub) => {
             xpub.wildcard == descriptor::Wildcard::Unhardened
         }
@@ -342,10 +347,15 @@ impl InheritanceDescriptor {
                 &mut self,
                 pk: &descriptor::DescriptorPublicKey,
             ) -> Result<DerivedPublicKey, descriptor::ConversionError> {
-                let definite_key = pk.clone().at_derivation_index(self.0);
+                let definite_key = pk
+                    .clone()
+                    .at_derivation_index(self.0)
+                    .expect("We disallow multipath keys.");
                 let origin = (
                     definite_key.master_fingerprint(),
-                    definite_key.full_derivation_path(),
+                    definite_key
+                        .full_derivation_path()
+                        .expect("We disallow multipath keys."),
                 );
                 let key = definite_key.derive_public_key(self.1)?;
                 Ok(DerivedPublicKey { origin, key })