Add BatchSignerTask

Uses a wrapper around AlgorithmMachine Schnorrkel to let the message be &[].

Cargo.lock

@@ -8724,10 +8724,13 @@ dependencies = [
  "async-trait",
  "borsh",
  "ciphersuite",
+ "frost-schnorrkel",
  "log",
  "modular-frost",
  "parity-scale-codec",
+ "rand_core",
  "serai-db",
+ "serai-in-instructions-primitives",
  "serai-processor-frost-attempt-manager",
  "serai-processor-messages",
  "serai-processor-primitives",

processor/scanner/src/db.rs

@@ -548,36 +548,36 @@ mod _public_db {
 
   db_channel! {
     ScannerPublic {
-      BatchToSign: (key: &[u8]) -> Batch,
-      AcknowledgedBatch: (key: &[u8]) -> u32,
+      BatchesToSign: (key: &[u8]) -> Batch,
+      AcknowledgedBatches: (key: &[u8]) -> u32,
       CompletedEventualities: (key: &[u8]) -> [u8; 32],
     }
   }
 }
 
 /// The batches to sign and publish.
-pub struct BatchToSign<K: GroupEncoding>(PhantomData<K>);
-impl<K: GroupEncoding> BatchToSign<K> {
+pub struct BatchesToSign<K: GroupEncoding>(PhantomData<K>);
+impl<K: GroupEncoding> BatchesToSign<K> {
   pub(crate) fn send(txn: &mut impl DbTxn, key: &K, batch: &Batch) {
-    _public_db::BatchToSign::send(txn, key.to_bytes().as_ref(), batch);
+    _public_db::BatchesToSign::send(txn, key.to_bytes().as_ref(), batch);
   }
 
   /// Receive a batch to sign and publish.
   pub fn try_recv(txn: &mut impl DbTxn, key: &K) -> Option<Batch> {
-    _public_db::BatchToSign::try_recv(txn, key.to_bytes().as_ref())
+    _public_db::BatchesToSign::try_recv(txn, key.to_bytes().as_ref())
   }
 }
 
 /// The batches which were acknowledged on-chain.
-pub struct AcknowledgedBatch<K: GroupEncoding>(PhantomData<K>);
-impl<K: GroupEncoding> AcknowledgedBatch<K> {
+pub struct AcknowledgedBatches<K: GroupEncoding>(PhantomData<K>);
+impl<K: GroupEncoding> AcknowledgedBatches<K> {
   pub(crate) fn send(txn: &mut impl DbTxn, key: &K, batch: u32) {
-    _public_db::AcknowledgedBatch::send(txn, key.to_bytes().as_ref(), &batch);
+    _public_db::AcknowledgedBatches::send(txn, key.to_bytes().as_ref(), &batch);
   }
 
   /// Receive the ID of a batch which was acknowledged.
   pub fn try_recv(txn: &mut impl DbTxn, key: &K) -> Option<u32> {
-    _public_db::AcknowledgedBatch::try_recv(txn, key.to_bytes().as_ref())
+    _public_db::AcknowledgedBatches::try_recv(txn, key.to_bytes().as_ref())
   }
 }
 

processor/scanner/src/lib.rs

@@ -21,7 +21,7 @@ pub use lifetime::LifetimeStage;
 // Database schema definition and associated functions.
 mod db;
 use db::ScannerGlobalDb;
-pub use db::{BatchToSign, AcknowledgedBatch, CompletedEventualities};
+pub use db::{BatchesToSign, AcknowledgedBatches, CompletedEventualities};
 // Task to index the blockchain, ensuring we don't reorganize finalized blocks.
 mod index;
 // Scans blocks for received coins.

processor/scanner/src/report/mod.rs

@@ -8,7 +8,7 @@ use serai_in_instructions_primitives::{MAX_BATCH_SIZE, Batch};
 
 use primitives::task::ContinuallyRan;
 use crate::{
-  db::{Returnable, ScannerGlobalDb, InInstructionData, ScanToReportDb, BatchToSign},
+  db::{Returnable, ScannerGlobalDb, InInstructionData, ScanToReportDb, BatchesToSign},
   index,
   scan::next_to_scan_for_outputs_block,
   ScannerFeed, KeyFor,
@@ -160,7 +160,7 @@ impl<D: Db, S: ScannerFeed> ContinuallyRan for ReportTask<D, S> {
         }
 
         for batch in batches {
-          BatchToSign::send(&mut txn, &external_key_for_session_to_sign_batch, &batch);
+          BatchesToSign::send(&mut txn, &external_key_for_session_to_sign_batch, &batch);
         }
       }
 

processor/scanner/src/substrate/mod.rs

@@ -6,7 +6,7 @@ use serai_coins_primitives::{OutInstruction, OutInstructionWithBalance};
 
 use primitives::task::ContinuallyRan;
 use crate::{
-  db::{ScannerGlobalDb, SubstrateToEventualityDb, AcknowledgedBatch},
+  db::{ScannerGlobalDb, SubstrateToEventualityDb, AcknowledgedBatches},
   report, ScannerFeed, KeyFor,
 };
 
@@ -82,7 +82,7 @@ impl<D: Db, S: ScannerFeed> ContinuallyRan for SubstrateTask<D, S> {
           {
             let external_key_for_session_to_sign_batch =
               report::take_external_key_for_session_to_sign_batch::<S>(&mut txn, batch_id).unwrap();
-            AcknowledgedBatch::send(&mut txn, &external_key_for_session_to_sign_batch, batch_id);
+            AcknowledgedBatches::send(&mut txn, &external_key_for_session_to_sign_batch, batch_id);
           }
 
           // Mark we made progress and handle this

processor/signers/Cargo.toml

@@ -21,15 +21,18 @@ workspace = true
 
 [dependencies]
 async-trait = { version = "0.1", default-features = false }
+rand_core = { version = "0.6", default-features = false }
 zeroize = { version = "1", default-features = false, features = ["std"] }
 
 ciphersuite = { path = "../../crypto/ciphersuite", default-features = false, features = ["std"] }
 frost = { package = "modular-frost", path = "../../crypto/frost", default-features = false }
+frost-schnorrkel = { path = "../../crypto/schnorrkel", default-features = false }
 
 scale = { package = "parity-scale-codec", version = "3", default-features = false, features = ["std"] }
 borsh = { version = "1", default-features = false, features = ["std", "derive", "de_strict_order"] }
 
 serai-validator-sets-primitives = { path = "../../substrate/validator-sets/primitives", default-features = false, features = ["std"] }
+serai-in-instructions-primitives = { path = "../../substrate/in-instructions/primitives", default-features = false, features = ["std"] }
 
 serai-db = { path = "../../common/db" }
 log = { version = "0.4", default-features = false, features = ["std"] }

processor/signers/src/batch/db.rs

@@ -0,0 +1,13 @@
+use serai_validator_sets_primitives::Session;
+use serai_in_instructions_primitives::{Batch, SignedBatch};
+
+use serai_db::{Get, DbTxn, create_db};
+
+create_db! {
+  BatchSigner {
+    ActiveSigningProtocols: (session: Session) -> Vec<u32>,
+    Batches: (id: u32) -> Batch,
+    SignedBatches: (id: u32) -> SignedBatch,
+    LastAcknowledgedBatch: () -> u32,
+  }
+}

processor/signers/src/batch/mod.rs

@@ -0,0 +1,180 @@
+use std::collections::HashSet;
+
+use ciphersuite::{group::GroupEncoding, Ristretto};
+use frost::dkg::ThresholdKeys;
+
+use serai_validator_sets_primitives::Session;
+use serai_in_instructions_primitives::{SignedBatch, batch_message};
+
+use serai_db::{DbTxn, Db};
+
+use messages::sign::VariantSignId;
+
+use primitives::task::ContinuallyRan;
+use scanner::{BatchesToSign, AcknowledgedBatches};
+
+use frost_attempt_manager::*;
+
+use crate::{
+  db::{CoordinatorToBatchSignerMessages, BatchSignerToCoordinatorMessages},
+  WrappedSchnorrkelMachine,
+};
+
+mod db;
+use db::*;
+
+// Fetches batches to sign and signs them.
+pub(crate) struct BatchSignerTask<D: Db, E: GroupEncoding> {
+  db: D,
+
+  session: Session,
+  external_key: E,
+  keys: Vec<ThresholdKeys<Ristretto>>,
+
+  active_signing_protocols: HashSet<u32>,
+  attempt_manager: AttemptManager<D, WrappedSchnorrkelMachine>,
+}
+
+impl<D: Db, E: GroupEncoding> BatchSignerTask<D, E> {
+  pub(crate) fn new(
+    db: D,
+    session: Session,
+    external_key: E,
+    keys: Vec<ThresholdKeys<Ristretto>>,
+  ) -> Self {
+    let mut active_signing_protocols = HashSet::new();
+    let mut attempt_manager = AttemptManager::new(
+      db.clone(),
+      session,
+      keys.first().expect("creating a batch signer with 0 keys").params().i(),
+    );
+
+    // Re-register all active signing protocols
+    for id in ActiveSigningProtocols::get(&db, session).unwrap_or(vec![]) {
+      active_signing_protocols.insert(id);
+
+      let batch = Batches::get(&db, id).unwrap();
+      assert_eq!(batch.id, id);
+
+      let mut machines = Vec::with_capacity(keys.len());
+      for keys in &keys {
+        machines.push(WrappedSchnorrkelMachine::new(keys.clone(), batch_message(&batch)));
+      }
+      attempt_manager.register(VariantSignId::Batch(id), machines);
+    }
+
+    Self { db, session, external_key, keys, active_signing_protocols, attempt_manager }
+  }
+}
+
+#[async_trait::async_trait]
+impl<D: Db, E: Send + GroupEncoding> ContinuallyRan for BatchSignerTask<D, E> {
+  async fn run_iteration(&mut self) -> Result<bool, String> {
+    let mut iterated = false;
+
+    // Check for new batches to sign
+    loop {
+      let mut txn = self.db.txn();
+      let Some(batch) = BatchesToSign::try_recv(&mut txn, &self.external_key) else {
+        break;
+      };
+      iterated = true;
+
+      // Save this to the database as a transaction to sign
+      self.active_signing_protocols.insert(batch.id);
+      ActiveSigningProtocols::set(
+        &mut txn,
+        self.session,
+        &self.active_signing_protocols.iter().copied().collect(),
+      );
+      Batches::set(&mut txn, batch.id, &batch);
+
+      let mut machines = Vec::with_capacity(self.keys.len());
+      for keys in &self.keys {
+        machines.push(WrappedSchnorrkelMachine::new(keys.clone(), batch_message(&batch)));
+      }
+      for msg in self.attempt_manager.register(VariantSignId::Batch(batch.id), machines) {
+        BatchSignerToCoordinatorMessages::send(&mut txn, self.session, &msg);
+      }
+
+      txn.commit();
+    }
+
+    // Check for acknowledged Batches (meaning we should no longer sign for these Batches)
+    loop {
+      let mut txn = self.db.txn();
+      let Some(id) = AcknowledgedBatches::try_recv(&mut txn, &self.external_key) else {
+        break;
+      };
+
+      {
+        let last_acknowledged = LastAcknowledgedBatch::get(&txn);
+        if Some(id) > last_acknowledged {
+          LastAcknowledgedBatch::set(&mut txn, &id);
+        }
+      }
+
+      /*
+        We may have yet to register this signing protocol.
+
+        While `BatchesToSign` is populated before `AcknowledgedBatches`, we could theoretically have
+        `BatchesToSign` populated with a new batch _while iterating over `AcknowledgedBatches`_, and
+        then have `AcknowledgedBatched` populated. In that edge case, we will see the
+        acknowledgement notification before we see the transaction.
+
+        In such a case, we break (dropping the txn, re-queueing the acknowledgement notification).
+        On the task's next iteration, we'll process the Batch from `BatchesToSign` and be
+        able to make progress.
+      */
+      if !self.active_signing_protocols.remove(&id) {
+        break;
+      }
+      iterated = true;
+
+      // Since it was, remove this as an active signing protocol
+      ActiveSigningProtocols::set(
+        &mut txn,
+        self.session,
+        &self.active_signing_protocols.iter().copied().collect(),
+      );
+      // Clean up the database
+      Batches::del(&mut txn, id);
+      SignedBatches::del(&mut txn, id);
+
+      // We retire with a txn so we either successfully flag this Batch as acknowledged, and
+      // won't re-register it (making this retire safe), or we don't flag it, meaning we will
+      // re-register it, yet that's safe as we have yet to retire it
+      self.attempt_manager.retire(&mut txn, VariantSignId::Batch(id));
+
+      txn.commit();
+    }
+
+    // Handle any messages sent to us
+    loop {
+      let mut txn = self.db.txn();
+      let Some(msg) = CoordinatorToBatchSignerMessages::try_recv(&mut txn, self.session) else {
+        break;
+      };
+      iterated = true;
+
+      match self.attempt_manager.handle(msg) {
+        Response::Messages(msgs) => {
+          for msg in msgs {
+            BatchSignerToCoordinatorMessages::send(&mut txn, self.session, &msg);
+          }
+        }
+        Response::Signature { id, signature } => {
+          let VariantSignId::Batch(id) = id else { panic!("BatchSignerTask signed a non-Batch") };
+          let batch =
+            Batches::get(&txn, id).expect("signed a Batch we didn't save to the database");
+          let signed_batch = SignedBatch { batch, signature: signature.into() };
+          SignedBatches::set(&mut txn, signed_batch.batch.id, &signed_batch);
+        }
+      }
+
+      txn.commit();
+    }
+
+    Ok(iterated)
+  }
+}

processor/signers/src/coordinator.rs

@@ -93,6 +93,8 @@ impl<D: Db, C: Coordinator> ContinuallyRan for CoordinatorTask<D, C> {
       }
     }
 
+    // TODO: For max(last acknowledged batch, last published batch) onwards, publish every batch
+
     Ok(iterated)
   }
 }

processor/signers/src/lib.rs

@@ -11,6 +11,7 @@ use ciphersuite::{group::GroupEncoding, Ciphersuite, Ristretto};
 use frost::dkg::{ThresholdCore, ThresholdKeys};
 
 use serai_validator_sets_primitives::Session;
+use serai_in_instructions_primitives::SignedBatch;
 
 use serai_db::{DbTxn, Db};
 
@@ -19,25 +20,34 @@ use messages::sign::{VariantSignId, ProcessorMessage, CoordinatorMessage};
 use primitives::task::{Task, TaskHandle, ContinuallyRan};
 use scheduler::{Transaction, SignableTransaction, TransactionFor};
 
+mod wrapped_schnorrkel;
+pub(crate) use wrapped_schnorrkel::WrappedSchnorrkelMachine;
+
 pub(crate) mod db;
 
 mod coordinator;
 use coordinator::CoordinatorTask;
 
+mod batch;
+use batch::BatchSignerTask;
+
 mod transaction;
-use transaction::TransactionTask;
+use transaction::TransactionSignerTask;
 
 /// A connection to the Coordinator which messages can be published with.
 #[async_trait::async_trait]
 pub trait Coordinator: 'static + Send + Sync {
-  /// An error encountered when sending a message.
+  /// An error encountered when interacting with a coordinator.
   ///
-  /// This MUST be an ephemeral error. Retrying sending a message MUST eventually resolve without
+  /// This MUST be an ephemeral error. Retrying an interaction MUST eventually resolve without
   /// manual intervention/changing the arguments.
   type EphemeralError: Debug;
 
   /// Send a `messages::sign::ProcessorMessage`.
   async fn send(&mut self, message: ProcessorMessage) -> Result<(), Self::EphemeralError>;
+
+  /// Publish a `SignedBatch`.
+  async fn publish_batch(&mut self, batch: SignedBatch) -> Result<(), Self::EphemeralError>;
 }
 
 /// An object capable of publishing a transaction.
@@ -111,13 +121,18 @@ impl<ST: SignableTransaction> Signers<ST> {
           <ST::Ciphersuite as Ciphersuite>::read_G(&mut external_key_bytes).unwrap();
         assert!(external_key_bytes.is_empty());
 
+        // Drain the Batches to sign
+        // This will be fully populated by the scanner before retiry occurs, making this perfect
+        // in not leaving any pending blobs behind
+        while scanner::BatchesToSign::try_recv(&mut txn, &external_key).is_some() {}
+        // Drain the acknowledged batches to no longer sign
+        while scanner::AcknowledgedBatches::try_recv(&mut txn, &external_key).is_some() {}
+
         // Drain the transactions to sign
-        // TransactionsToSign will be fully populated by the scheduler before retiry occurs, making
-        // this perfect in not leaving any pending blobs behind
+        // This will be fully populated by the scheduler before retiry
         while scheduler::TransactionsToSign::<ST>::try_recv(&mut txn, &external_key).is_some() {}
 
         // Drain the completed Eventualities
-        // This will be fully populated by the scanner before retiry
         while scanner::CompletedEventualities::try_recv(&mut txn, &external_key).is_some() {}
 
         // Drain our DB channels
@@ -156,18 +171,37 @@ impl<ST: SignableTransaction> Signers<ST> {
 
       // TODO: Batch signer, cosigner, slash report signers
 
+      let (batch_task, batch_handle) = Task::new();
+      tokio::spawn(
+        BatchSignerTask::new(
+          db.clone(),
+          session,
+          external_keys[0].group_key(),
+          substrate_keys.clone(),
+        )
+        .continually_run(batch_task, vec![coordinator_handle.clone()]),
+      );
+
       let (transaction_task, transaction_handle) = Task::new();
       tokio::spawn(
-        TransactionTask::<_, ST, _>::new(db.clone(), publisher.clone(), session, external_keys)
+        TransactionSignerTask::<_, ST, _>::new(
+          db.clone(),
+          publisher.clone(),
+          session,
+          external_keys,
+        )
         .continually_run(transaction_task, vec![coordinator_handle.clone()]),
       );
 
-      tasks.insert(session, Tasks {
+      tasks.insert(
+        session,
+        Tasks {
           cosigner: todo!("TODO"),
-        batch: todo!("TODO"),
+          batch: batch_handle,
           slash_report: todo!("TODO"),
           transaction: transaction_handle,
-      });
+        },
+      );
     }
 
     Self { coordinator_handle, tasks, _ST: PhantomData }
@@ -246,19 +280,27 @@ impl<ST: SignableTransaction> Signers<ST> {
     match sign_id.id {
       VariantSignId::Cosign(_) => {
         db::CoordinatorToCosignerMessages::send(txn, sign_id.session, message);
-        if let Some(tasks) = tasks { tasks.cosigner.run_now(); }
+        if let Some(tasks) = tasks {
+          tasks.cosigner.run_now();
+        }
       }
       VariantSignId::Batch(_) => {
         db::CoordinatorToBatchSignerMessages::send(txn, sign_id.session, message);
-        if let Some(tasks) = tasks { tasks.batch.run_now(); }
+        if let Some(tasks) = tasks {
+          tasks.batch.run_now();
+        }
       }
       VariantSignId::SlashReport(_) => {
         db::CoordinatorToSlashReportSignerMessages::send(txn, sign_id.session, message);
-        if let Some(tasks) = tasks { tasks.slash_report.run_now(); }
+        if let Some(tasks) = tasks {
+          tasks.slash_report.run_now();
+        }
       }
       VariantSignId::Transaction(_) => {
         db::CoordinatorToTransactionSignerMessages::send(txn, sign_id.session, message);
-        if let Some(tasks) = tasks { tasks.transaction.run_now(); }
+        if let Some(tasks) = tasks {
+          tasks.transaction.run_now();
+        }
       }
     }
   }

processor/signers/src/transaction/mod.rs

@@ -26,7 +26,7 @@ mod db;
 use db::*;
 
 // Fetches transactions to sign and signs them.
-pub(crate) struct TransactionTask<
+pub(crate) struct TransactionSignerTask<
   D: Db,
   ST: SignableTransaction,
   P: TransactionPublisher<TransactionFor<ST>>,
@@ -44,7 +44,7 @@ pub(crate) struct TransactionTask<
 }
 
 impl<D: Db, ST: SignableTransaction, P: TransactionPublisher<TransactionFor<ST>>>
-  TransactionTask<D, ST, P>
+  TransactionSignerTask<D, ST, P>
 {
   pub(crate) fn new(
     db: D,
@@ -90,7 +90,7 @@ impl<D: Db, ST: SignableTransaction, P: TransactionPublisher<TransactionFor<ST>>
 
 #[async_trait::async_trait]
 impl<D: Db, ST: SignableTransaction, P: TransactionPublisher<TransactionFor<ST>>> ContinuallyRan
-  for TransactionTask<D, ST, P>
+  for TransactionSignerTask<D, ST, P>
 {
   async fn run_iteration(&mut self) -> Result<bool, String> {
     let mut iterated = false;
@@ -193,17 +193,16 @@ impl<D: Db, ST: SignableTransaction, P: TransactionPublisher<TransactionFor<ST>>
               &mut txn,
               match id {
                 VariantSignId::Transaction(id) => id,
-                _ => panic!("TransactionTask signed a non-transaction"),
+                _ => panic!("TransactionSignerTask signed a non-transaction"),
               },
               &buf,
             );
           }
 
-          self
-            .publisher
-            .publish(signed_tx)
-            .await
-            .map_err(|e| format!("couldn't publish transaction: {e:?}"))?;
+          match self.publisher.publish(signed_tx).await {
+            Ok(()) => {}
+            Err(e) => log::warn!("couldn't broadcast transaction: {e:?}"),
+          }
         }
       }
 

processor/signers/src/wrapped_schnorrkel.rs

@@ -0,0 +1,86 @@
+use std::{
+  collections::HashMap,
+  io::{self, Read},
+};
+
+use rand_core::{RngCore, CryptoRng};
+
+use ciphersuite::Ristretto;
+use frost::{
+  dkg::{Participant, ThresholdKeys},
+  FrostError,
+  algorithm::Algorithm,
+  sign::*,
+};
+use frost_schnorrkel::Schnorrkel;
+
+// This wraps a Schnorrkel sign machine into one with a preset message.
+#[derive(Clone)]
+pub(crate) struct WrappedSchnorrkelMachine(ThresholdKeys<Ristretto>, Vec<u8>);
+impl WrappedSchnorrkelMachine {
+  pub(crate) fn new(keys: ThresholdKeys<Ristretto>, msg: Vec<u8>) -> Self {
+    Self(keys, msg)
+  }
+}
+
+pub(crate) struct WrappedSchnorrkelSignMachine(
+  <AlgorithmMachine<Ristretto, Schnorrkel> as PreprocessMachine>::SignMachine,
+  Vec<u8>,
+);
+
+type Signature = <AlgorithmMachine<Ristretto, Schnorrkel> as PreprocessMachine>::Signature;
+impl PreprocessMachine for WrappedSchnorrkelMachine {
+  type Preprocess = <AlgorithmMachine<Ristretto, Schnorrkel> as PreprocessMachine>::Preprocess;
+  type Signature = Signature;
+  type SignMachine = WrappedSchnorrkelSignMachine;
+
+  fn preprocess<R: RngCore + CryptoRng>(
+    self,
+    rng: &mut R,
+  ) -> (Self::SignMachine, Preprocess<Ristretto, <Schnorrkel as Algorithm<Ristretto>>::Addendum>)
+  {
+    let WrappedSchnorrkelMachine(keys, batch) = self;
+    let (machine, preprocess) =
+      AlgorithmMachine::new(Schnorrkel::new(b"substrate"), keys).preprocess(rng);
+    (WrappedSchnorrkelSignMachine(machine, batch), preprocess)
+  }
+}
+
+impl SignMachine<Signature> for WrappedSchnorrkelSignMachine {
+  type Params = <AlgorithmSignMachine<Ristretto, Schnorrkel> as SignMachine<Signature>>::Params;
+  type Keys = <AlgorithmSignMachine<Ristretto, Schnorrkel> as SignMachine<Signature>>::Keys;
+  type Preprocess =
+    <AlgorithmSignMachine<Ristretto, Schnorrkel> as SignMachine<Signature>>::Preprocess;
+  type SignatureShare =
+    <AlgorithmSignMachine<Ristretto, Schnorrkel> as SignMachine<Signature>>::SignatureShare;
+  type SignatureMachine =
+    <AlgorithmSignMachine<Ristretto, Schnorrkel> as SignMachine<Signature>>::SignatureMachine;
+
+  fn cache(self) -> CachedPreprocess {
+    unimplemented!()
+  }
+
+  fn from_cache(
+    _algorithm: Schnorrkel,
+    _keys: ThresholdKeys<Ristretto>,
+    _cache: CachedPreprocess,
+  ) -> (Self, Self::Preprocess) {
+    unimplemented!()
+  }
+
+  fn read_preprocess<R: Read>(&self, reader: &mut R) -> io::Result<Self::Preprocess> {
+    self.0.read_preprocess(reader)
+  }
+
+  fn sign(
+    self,
+    preprocesses: HashMap<
+      Participant,
+      Preprocess<Ristretto, <Schnorrkel as Algorithm<Ristretto>>::Addendum>,
+    >,
+    msg: &[u8],
+  ) -> Result<(Self::SignatureMachine, SignatureShare<Ristretto>), FrostError> {
+    assert!(msg.is_empty());
+    self.0.sign(preprocesses, &self.1)
+  }
+}

processor/src/multisigs/mod.rs

@@ -1,8 +0,0 @@
-#[allow(clippy::type_complexity)]
-#[derive(Clone, Debug)]
-pub enum MultisigEvent<N: Network> {
-  // Batches to publish
-  Batches(Option<(<N::Curve as Ciphersuite>::G, <N::Curve as Ciphersuite>::G)>, Vec<Batch>),
-  // Eventuality completion found on-chain
-  Completed(Vec<u8>, [u8; 32], N::Eventuality),
-}