Get all processors to compile again

Requires splitting `serai-cosign` into `serai-cosign` and `serai-cosign-types`
so the processor don't require `serai-client/serai` (not correct yet).

.github/workflows/tests.yml

@@ -61,6 +61,7 @@ jobs:
             -p serai-monero-processor \
             -p tendermint-machine \
             -p tributary-sdk \
+            -p serai-cosign-types \
             -p serai-cosign \
             -p serai-coordinator-substrate \
             -p serai-coordinator-tributary \

Cargo.toml

@@ -82,6 +82,7 @@ members = [
 
   "coordinator/tributary-sdk/tendermint",
   "coordinator/tributary-sdk",
+  "coordinator/cosign/types",
   "coordinator/cosign",
   "coordinator/substrate",
   "coordinator/tributary",

coordinator/cosign/Cargo.toml

@@ -31,3 +31,5 @@ tokio = { version = "1", default-features = false }
 
 serai-db = { path = "../../common/db", version = "0.1.1" }
 serai-task = { path = "../../common/task", version = "0.1" }
+
+serai-cosign-types = { path = "./types" }

coordinator/cosign/src/lib.rs

@@ -19,6 +19,8 @@ use serai_client::{
 use serai_db::*;
 use serai_task::*;
 
+use serai_cosign_types::*;
+
 /// The cosigns which are intended to be performed.
 mod intend;
 /// The evaluator of the cosigns.

coordinator/cosign/types/Cargo.toml

@@ -0,0 +1,25 @@
+[package]
+name = "serai-cosign-types"
+version = "0.1.0"
+description = "Evaluator of cosigns for the Serai network"
+license = "AGPL-3.0-only"
+repository = "https://github.com/serai-dex/serai/tree/develop/coordinator/cosign"
+authors = ["Luke Parker <lukeparker5132@gmail.com>"]
+keywords = []
+edition = "2021"
+publish = false
+rust-version = "1.85"
+
+[package.metadata.docs.rs]
+all-features = true
+rustdoc-args = ["--cfg", "docsrs"]
+
+[lints]
+workspace = true
+
+[dependencies]
+schnorrkel = { version = "0.11", default-features = false, features = ["std"] }
+
+borsh = { version = "1", default-features = false, features = ["std", "derive", "de_strict_order"] }
+
+serai-primitives = { path = "../../../substrate/primitives", default-features = false, features = ["std"] }

coordinator/cosign/types/LICENSE

@@ -0,0 +1,15 @@
+AGPL-3.0-only license
+
+Copyright (c) 2023-2025 Luke Parker
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License Version 3 as
+published by the Free Software Foundation.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.

coordinator/cosign/types/src/lib.rs

@@ -0,0 +1,72 @@
+#![cfg_attr(docsrs, feature(doc_auto_cfg))]
+#![deny(missing_docs)]
+//! Types used when cosigning Serai. For more info, please see `serai-cosign`.
+use borsh::{BorshSerialize, BorshDeserialize};
+
+use serai_primitives::{crypto::Public, network_id::ExternalNetworkId};
+
+/// The schnorrkel context to used when signing a cosign.
+pub const COSIGN_CONTEXT: &[u8] = b"/serai/coordinator/cosign";
+
+/// An intended cosign.
+#[derive(Clone, Copy, PartialEq, Eq, Debug, BorshSerialize, BorshDeserialize)]
+pub struct CosignIntent {
+  /// The global session this cosign is being performed under.
+  pub global_session: [u8; 32],
+  /// The number of the block to cosign.
+  pub block_number: u64,
+  /// The hash of the block to cosign.
+  pub block_hash: [u8; 32],
+  /// If this cosign must be handled before further cosigns are.
+  pub notable: bool,
+}
+
+/// A cosign.
+#[derive(Clone, PartialEq, Eq, Debug, BorshSerialize, BorshDeserialize)]
+pub struct Cosign {
+  /// The global session this cosign is being performed under.
+  pub global_session: [u8; 32],
+  /// The number of the block to cosign.
+  pub block_number: u64,
+  /// The hash of the block to cosign.
+  pub block_hash: [u8; 32],
+  /// The actual cosigner.
+  pub cosigner: ExternalNetworkId,
+}
+
+impl CosignIntent {
+  /// Convert this into a `Cosign`.
+  pub fn into_cosign(self, cosigner: ExternalNetworkId) -> Cosign {
+    let CosignIntent { global_session, block_number, block_hash, notable: _ } = self;
+    Cosign { global_session, block_number, block_hash, cosigner }
+  }
+}
+
+impl Cosign {
+  /// The message to sign to sign this cosign.
+  ///
+  /// This must be signed with schnorrkel, the context set to `COSIGN_CONTEXT`.
+  pub fn signature_message(&self) -> Vec<u8> {
+    // We use a schnorrkel context to domain-separate this
+    borsh::to_vec(self).unwrap()
+  }
+}
+
+/// A signed cosign.
+#[derive(Clone, Debug, BorshSerialize, BorshDeserialize)]
+pub struct SignedCosign {
+  /// The cosign.
+  pub cosign: Cosign,
+  /// The signature for the cosign.
+  pub signature: [u8; 64],
+}
+
+impl SignedCosign {
+  /// Verify a cosign's signature.
+  pub fn verify_signature(&self, signer: Public) -> bool {
+    let Ok(signer) = schnorrkel::PublicKey::from_bytes(&signer.0) else { return false };
+    let Ok(signature) = schnorrkel::Signature::from_bytes(&self.signature) else { return false };
+
+    signer.verify_simple(COSIGN_CONTEXT, &self.cosign.signature_message(), &signature).is_ok()
+  }
+}

coordinator/p2p/Cargo.toml

@@ -22,7 +22,7 @@ borsh = { version = "1", default-features = false, features = ["std", "derive",
 
 serai-db = { path = "../../common/db", version = "0.1" }
 
-serai-client = { path = "../../substrate/client", default-features = false, features = ["serai"] }
+serai-primitives = { path = "../../substrate/primitives", default-features = false, features = ["std"] }
 serai-cosign = { path = "../cosign" }
 tributary-sdk = { path = "../tributary-sdk" }
 

coordinator/p2p/src/heartbeat.rs

@@ -1,7 +1,7 @@
 use core::future::Future;
 use std::time::{Duration, SystemTime};
 
-use serai_client::validator_sets::primitives::{MAX_KEY_SHARES_PER_SET, ExternalValidatorSet};
+use serai_primitives::{MAX_KEY_SHARES_PER_SET, ExternalValidatorSet};
 
 use futures_lite::FutureExt;
 

coordinator/p2p/src/lib.rs

@@ -7,7 +7,7 @@ use std::collections::HashMap;
 
 use borsh::{BorshSerialize, BorshDeserialize};
 
-use serai_client::{primitives::ExternalNetworkId, validator_sets::primitives::ExternalValidatorSet};
+use serai_primitives::{network_id::ExternalNetworkId, validator_sets::ExternalValidatorSet};
 
 use serai_db::Db;
 use tributary_sdk::{ReadWrite, TransactionTrait, Tributary, TributaryReader};

coordinator/tributary-sdk/Cargo.toml

@@ -36,7 +36,7 @@ log = { version = "0.4", default-features = false, features = ["std"] }
 
 serai-db = { path = "../../common/db", version = "0.1" }
 
-scale = { package = "parity-scale-codec", version = "3", default-features = false, features = ["std", "derive"] }
+borsh = { version = "1", default-features = false, features = ["std", "derive", "de_strict_order"] }
 futures-util = { version = "0.3", default-features = false, features = ["std", "sink", "channel"] }
 futures-channel = { version = "0.3", default-features = false, features = ["std", "sink"] }
 tendermint = { package = "tendermint-machine", path = "./tendermint", version = "0.2" }

coordinator/tributary-sdk/src/blockchain.rs

@@ -5,7 +5,7 @@ use ciphersuite::{group::GroupEncoding, Ciphersuite};
 
 use serai_db::{Get, DbTxn, Db};
 
-use scale::Decode;
+use borsh::BorshDeserialize;
 
 use tendermint::ext::{Network, Commit};
 
@@ -62,7 +62,7 @@ impl<D: Db, T: TransactionTrait> Blockchain<D, T> {
     D::key(
       b"tributary_blockchain",
       b"next_nonce",
-      [genesis.as_ref(), signer.to_bytes().as_ref(), order].concat(),
+      [genesis.as_slice(), signer.to_bytes().as_slice(), order].concat(),
     )
   }
 
@@ -106,7 +106,7 @@ impl<D: Db, T: TransactionTrait> Blockchain<D, T> {
 
   pub(crate) fn block_from_db(db: &D, genesis: [u8; 32], block: &[u8; 32]) -> Option<Block<T>> {
     db.get(Self::block_key(&genesis, block))
-      .map(|bytes| Block::<T>::read::<&[u8]>(&mut bytes.as_ref()).unwrap())
+      .map(|bytes| Block::<T>::read::<&[u8]>(&mut bytes.as_slice()).unwrap())
   }
 
   pub(crate) fn commit_from_db(db: &D, genesis: [u8; 32], block: &[u8; 32]) -> Option<Vec<u8>> {
@@ -166,7 +166,7 @@ impl<D: Db, T: TransactionTrait> Blockchain<D, T> {
       // we must have a commit per valid hash
       let commit = Self::commit_from_db(db, genesis, &hash).unwrap();
       // commit has to be valid if it is coming from our db
-      Some(Commit::<N::SignatureScheme>::decode(&mut commit.as_ref()).unwrap())
+      Some(Commit::<N::SignatureScheme>::deserialize_reader(&mut commit.as_slice()).unwrap())
     };
     let unsigned_in_chain =
       |hash: [u8; 32]| db.get(Self::unsigned_included_key(&self.genesis, &hash)).is_some();
@@ -241,7 +241,7 @@ impl<D: Db, T: TransactionTrait> Blockchain<D, T> {
     let commit = |block: u64| -> Option<Commit<N::SignatureScheme>> {
       let commit = self.commit_by_block_number(block)?;
       // commit has to be valid if it is coming from our db
-      Some(Commit::<N::SignatureScheme>::decode(&mut commit.as_ref()).unwrap())
+      Some(Commit::<N::SignatureScheme>::deserialize_reader(&mut commit.as_slice()).unwrap())
     };
 
     let mut txn_db = db.clone();

coordinator/tributary-sdk/src/lib.rs

@@ -3,10 +3,11 @@ use std::{sync::Arc, io};
 
 use zeroize::Zeroizing;
 
+use borsh::BorshDeserialize;
+
 use ciphersuite::Ciphersuite;
 use dalek_ff_group::Ristretto;
 
-use scale::Decode;
 use futures_channel::mpsc::UnboundedReceiver;
 use futures_util::{StreamExt, SinkExt};
 use ::tendermint::{
@@ -177,7 +178,7 @@ impl<D: Db, T: TransactionTrait, P: P2p> Tributary<D, T, P> {
     let block_number = BlockNumber(blockchain.block_number());
 
     let start_time = if let Some(commit) = blockchain.commit(&blockchain.tip()) {
-      Commit::<Validators>::decode(&mut commit.as_ref()).unwrap().end_time
+      Commit::<Validators>::deserialize_reader(&mut commit.as_slice()).unwrap().end_time
     } else {
       start_time
     };
@@ -276,8 +277,8 @@ impl<D: Db, T: TransactionTrait, P: P2p> Tributary<D, T, P> {
     }
 
     let block = TendermintBlock(block.serialize());
-    let mut commit_ref = commit.as_ref();
-    let Ok(commit) = Commit::<Arc<Validators>>::decode(&mut commit_ref) else {
+    let mut commit_ref = commit.as_slice();
+    let Ok(commit) = Commit::<Arc<Validators>>::deserialize_reader(&mut commit_ref) else {
       log::error!("sent an invalidly serialized commit");
       return false;
     };
@@ -327,7 +328,7 @@ impl<D: Db, T: TransactionTrait, P: P2p> Tributary<D, T, P> {
 
       Some(&TENDERMINT_MESSAGE) => {
         let Ok(msg) =
-          SignedMessageFor::<TendermintNetwork<D, T, P>>::decode::<&[u8]>(&mut &msg[1 ..])
+          SignedMessageFor::<TendermintNetwork<D, T, P>>::deserialize_reader(&mut &msg[1 ..])
         else {
           log::error!("received invalid tendermint message");
           return false;
@@ -367,15 +368,17 @@ impl<D: Db, T: TransactionTrait> TributaryReader<D, T> {
     Blockchain::<D, T>::commit_from_db(&self.0, self.1, hash)
   }
   pub fn parsed_commit(&self, hash: &[u8; 32]) -> Option<Commit<Validators>> {
-    self.commit(hash).map(|commit| Commit::<Validators>::decode(&mut commit.as_ref()).unwrap())
+    self
+      .commit(hash)
+      .map(|commit| Commit::<Validators>::deserialize_reader(&mut commit.as_slice()).unwrap())
   }
   pub fn block_after(&self, hash: &[u8; 32]) -> Option<[u8; 32]> {
     Blockchain::<D, T>::block_after(&self.0, self.1, hash)
   }
   pub fn time_of_block(&self, hash: &[u8; 32]) -> Option<u64> {
-    self
-      .commit(hash)
-      .map(|commit| Commit::<Validators>::decode(&mut commit.as_ref()).unwrap().end_time)
+    self.commit(hash).map(|commit| {
+      Commit::<Validators>::deserialize_reader(&mut commit.as_slice()).unwrap().end_time
+    })
   }
 
   pub fn locally_provided_txs_in_block(&self, hash: &[u8; 32], order: &str) -> bool {

coordinator/tributary-sdk/src/tendermint/mod.rs

@@ -24,7 +24,7 @@ use schnorr::{
 
 use serai_db::Db;
 
-use scale::{Encode, Decode};
+use borsh::{BorshSerialize, BorshDeserialize};
 use tendermint::{
   SignedMessageFor,
   ext::{
@@ -249,7 +249,7 @@ impl Weights for Validators {
   }
 }
 
-#[derive(Clone, PartialEq, Eq, Debug, Encode, Decode)]
+#[derive(Clone, PartialEq, Eq, Debug, BorshSerialize, BorshDeserialize)]
 pub struct TendermintBlock(pub Vec<u8>);
 impl BlockTrait for TendermintBlock {
   type Id = [u8; 32];
@@ -301,7 +301,7 @@ impl<D: Db, T: TransactionTrait, P: P2p> Network for TendermintNetwork<D, T, P>
   fn broadcast(&mut self, msg: SignedMessageFor<Self>) -> impl Send + Future<Output = ()> {
     async move {
       let mut to_broadcast = vec![TENDERMINT_MESSAGE];
-      to_broadcast.extend(msg.encode());
+      msg.serialize(&mut to_broadcast).unwrap();
       self.p2p.broadcast(self.genesis, to_broadcast).await
     }
   }
@@ -391,7 +391,7 @@ impl<D: Db, T: TransactionTrait, P: P2p> Network for TendermintNetwork<D, T, P>
         return invalid_block();
       };
 
-      let encoded_commit = commit.encode();
+      let encoded_commit = borsh::to_vec(&commit).unwrap();
       loop {
         let block_res = self.blockchain.write().await.add_block::<Self>(
           &block,

coordinator/tributary-sdk/src/tendermint/tx.rs

@@ -1,6 +1,6 @@
 use std::io;
 
-use scale::{Encode, Decode, IoReader};
+use borsh::BorshDeserialize;
 
 use blake2::{Digest, Blake2s256};
 
@@ -27,14 +27,14 @@ pub enum TendermintTx {
 
 impl ReadWrite for TendermintTx {
   fn read<R: io::Read>(reader: &mut R) -> io::Result<Self> {
-    Evidence::decode(&mut IoReader(reader))
+    Evidence::deserialize_reader(reader)
       .map(TendermintTx::SlashEvidence)
       .map_err(|_| io::Error::new(io::ErrorKind::InvalidData, "invalid evidence format"))
   }
 
   fn write<W: io::Write>(&self, writer: &mut W) -> io::Result<()> {
     match self {
-      TendermintTx::SlashEvidence(ev) => writer.write_all(&ev.encode()),
+      TendermintTx::SlashEvidence(ev) => writer.write_all(&borsh::to_vec(&ev).unwrap()),
     }
   }
 }

coordinator/tributary-sdk/src/tests/transaction/mod.rs

@@ -13,8 +13,6 @@ use ciphersuite::{
 };
 use schnorr::SchnorrSignature;
 
-use scale::Encode;
-
 use ::tendermint::{
   ext::{Network, Signer as SignerTrait, SignatureScheme, BlockNumber, RoundNumber},
   SignedMessageFor, DataFor, Message, SignedMessage, Data, Evidence,
@@ -204,7 +202,7 @@ pub async fn signed_from_data<N: Network>(
     round: RoundNumber(round_number),
     data,
   };
-  let sig = signer.sign(&msg.encode()).await;
+  let sig = signer.sign(&borsh::to_vec(&msg).unwrap()).await;
   SignedMessage { msg, sig }
 }
 
@@ -217,5 +215,5 @@ pub async fn random_evidence_tx<N: Network>(
   let data = Data::Proposal(Some(RoundNumber(0)), b);
   let signer_id = signer.validator_id().await.unwrap();
   let signed = signed_from_data::<N>(signer, signer_id, 0, 0, data).await;
-  TendermintTx::SlashEvidence(Evidence::InvalidValidRound(signed.encode()))
+  TendermintTx::SlashEvidence(Evidence::InvalidValidRound(borsh::to_vec(&signed).unwrap()))
 }

coordinator/tributary-sdk/src/tests/transaction/tendermint.rs

@@ -6,8 +6,6 @@ use rand::{RngCore, rngs::OsRng};
 use dalek_ff_group::Ristretto;
 use ciphersuite::{Ciphersuite, group::ff::Field};
 
-use scale::Encode;
-
 use tendermint::{
   time::CanonicalInstant,
   round::RoundData,
@@ -52,7 +50,10 @@ async fn invalid_valid_round() {
     async move {
       let data = Data::Proposal(valid_round, TendermintBlock(vec![]));
       let signed = signed_from_data::<N>(signer.clone().into(), signer_id, 0, 0, data).await;
-      (signed.clone(), TendermintTx::SlashEvidence(Evidence::InvalidValidRound(signed.encode())))
+      (
+        signed.clone(),
+        TendermintTx::SlashEvidence(Evidence::InvalidValidRound(borsh::to_vec(&signed).unwrap())),
+      )
     }
   };
 
@@ -70,7 +71,8 @@ async fn invalid_valid_round() {
   let mut random_sig = [0u8; 64];
   OsRng.fill_bytes(&mut random_sig);
   signed.sig = random_sig;
-  let tx = TendermintTx::SlashEvidence(Evidence::InvalidValidRound(signed.encode()));
+  let tx =
+    TendermintTx::SlashEvidence(Evidence::InvalidValidRound(borsh::to_vec(&signed).unwrap()));
 
   // should fail
   assert!(verify_tendermint_tx::<N>(&tx, &validators, commit).is_err());
@@ -90,7 +92,10 @@ async fn invalid_precommit_signature() {
       let signed =
         signed_from_data::<N>(signer.clone().into(), signer_id, 1, 0, Data::Precommit(precommit))
           .await;
-      (signed.clone(), TendermintTx::SlashEvidence(Evidence::InvalidPrecommit(signed.encode())))
+      (
+        signed.clone(),
+        TendermintTx::SlashEvidence(Evidence::InvalidPrecommit(borsh::to_vec(&signed).unwrap())),
+      )
     }
   };
 
@@ -120,7 +125,8 @@ async fn invalid_precommit_signature() {
     let mut random_sig = [0u8; 64];
     OsRng.fill_bytes(&mut random_sig);
     signed.sig = random_sig;
-    let tx = TendermintTx::SlashEvidence(Evidence::InvalidPrecommit(signed.encode()));
+    let tx =
+      TendermintTx::SlashEvidence(Evidence::InvalidPrecommit(borsh::to_vec(&signed).unwrap()));
     assert!(verify_tendermint_tx::<N>(&tx, &validators, commit).is_err());
   }
 }
@@ -138,24 +144,32 @@ async fn evidence_with_prevote() {
       // it should fail for all reasons.
       let mut txs = vec![];
       txs.push(TendermintTx::SlashEvidence(Evidence::InvalidPrecommit(
-        signed_from_data::<N>(signer.clone().into(), signer_id, 0, 0, Data::Prevote(block_id))
-          .await
-          .encode(),
+        borsh::to_vec(
+          &&signed_from_data::<N>(signer.clone().into(), signer_id, 0, 0, Data::Prevote(block_id))
+            .await,
+        )
+        .unwrap(),
       )));
       txs.push(TendermintTx::SlashEvidence(Evidence::InvalidValidRound(
-        signed_from_data::<N>(signer.clone().into(), signer_id, 0, 0, Data::Prevote(block_id))
-          .await
-          .encode(),
+        borsh::to_vec(
+          &signed_from_data::<N>(signer.clone().into(), signer_id, 0, 0, Data::Prevote(block_id))
+            .await,
+        )
+        .unwrap(),
       )));
       // Since these require a second message, provide this one again
       // ConflictingMessages can be fired for actually conflicting Prevotes however
       txs.push(TendermintTx::SlashEvidence(Evidence::ConflictingMessages(
-        signed_from_data::<N>(signer.clone().into(), signer_id, 0, 0, Data::Prevote(block_id))
-          .await
-          .encode(),
-        signed_from_data::<N>(signer.clone().into(), signer_id, 0, 0, Data::Prevote(block_id))
-          .await
-          .encode(),
+        borsh::to_vec(
+          &signed_from_data::<N>(signer.clone().into(), signer_id, 0, 0, Data::Prevote(block_id))
+            .await,
+        )
+        .unwrap(),
+        borsh::to_vec(
+          &signed_from_data::<N>(signer.clone().into(), signer_id, 0, 0, Data::Prevote(block_id))
+            .await,
+        )
+        .unwrap(),
       )));
       txs
     }
@@ -189,16 +203,16 @@ async fn conflicting_msgs_evidence_tx() {
     // non-conflicting data should fail
     let signed_1 = signed_for_b_r(0, 0, Data::Proposal(None, TendermintBlock(vec![0x11]))).await;
     let tx = TendermintTx::SlashEvidence(Evidence::ConflictingMessages(
-      signed_1.encode(),
-      signed_1.encode(),
+      borsh::to_vec(&signed_1).unwrap(),
+      borsh::to_vec(&signed_1).unwrap(),
     ));
     assert!(verify_tendermint_tx::<N>(&tx, &validators, commit).is_err());
 
     // conflicting data should pass
     let signed_2 = signed_for_b_r(0, 0, Data::Proposal(None, TendermintBlock(vec![0x22]))).await;
     let tx = TendermintTx::SlashEvidence(Evidence::ConflictingMessages(
-      signed_1.encode(),
-      signed_2.encode(),
+      borsh::to_vec(&signed_1).unwrap(),
+      borsh::to_vec(&signed_2).unwrap(),
     ));
     verify_tendermint_tx::<N>(&tx, &validators, commit).unwrap();
 
@@ -206,16 +220,16 @@ async fn conflicting_msgs_evidence_tx() {
     // (except for Precommit)
     let signed_2 = signed_for_b_r(0, 1, Data::Proposal(None, TendermintBlock(vec![0x22]))).await;
     let tx = TendermintTx::SlashEvidence(Evidence::ConflictingMessages(
-      signed_1.encode(),
-      signed_2.encode(),
+      borsh::to_vec(&signed_1).unwrap(),
+      borsh::to_vec(&signed_2).unwrap(),
     ));
     verify_tendermint_tx::<N>(&tx, &validators, commit).unwrap_err();
 
     // Proposals for different block numbers should also fail as evidence
     let signed_2 = signed_for_b_r(1, 0, Data::Proposal(None, TendermintBlock(vec![0x22]))).await;
     let tx = TendermintTx::SlashEvidence(Evidence::ConflictingMessages(
-      signed_1.encode(),
-      signed_2.encode(),
+      borsh::to_vec(&signed_1).unwrap(),
+      borsh::to_vec(&signed_2).unwrap(),
     ));
     verify_tendermint_tx::<N>(&tx, &validators, commit).unwrap_err();
   }
@@ -225,16 +239,16 @@ async fn conflicting_msgs_evidence_tx() {
     // non-conflicting data should fail
     let signed_1 = signed_for_b_r(0, 0, Data::Prevote(Some([0x11; 32]))).await;
     let tx = TendermintTx::SlashEvidence(Evidence::ConflictingMessages(
-      signed_1.encode(),
-      signed_1.encode(),
+      borsh::to_vec(&signed_1).unwrap(),
+      borsh::to_vec(&signed_1).unwrap(),
     ));
     assert!(verify_tendermint_tx::<N>(&tx, &validators, commit).is_err());
 
     // conflicting data should pass
     let signed_2 = signed_for_b_r(0, 0, Data::Prevote(Some([0x22; 32]))).await;
     let tx = TendermintTx::SlashEvidence(Evidence::ConflictingMessages(
-      signed_1.encode(),
-      signed_2.encode(),
+      borsh::to_vec(&signed_1).unwrap(),
+      borsh::to_vec(&signed_2).unwrap(),
     ));
     verify_tendermint_tx::<N>(&tx, &validators, commit).unwrap();
 
@@ -242,16 +256,16 @@ async fn conflicting_msgs_evidence_tx() {
     // (except for Precommit)
     let signed_2 = signed_for_b_r(0, 1, Data::Prevote(Some([0x22; 32]))).await;
     let tx = TendermintTx::SlashEvidence(Evidence::ConflictingMessages(
-      signed_1.encode(),
-      signed_2.encode(),
+      borsh::to_vec(&signed_1).unwrap(),
+      borsh::to_vec(&signed_2).unwrap(),
     ));
     verify_tendermint_tx::<N>(&tx, &validators, commit).unwrap_err();
 
     // Proposals for different block numbers should also fail as evidence
     let signed_2 = signed_for_b_r(1, 0, Data::Prevote(Some([0x22; 32]))).await;
     let tx = TendermintTx::SlashEvidence(Evidence::ConflictingMessages(
-      signed_1.encode(),
-      signed_2.encode(),
+      borsh::to_vec(&signed_1).unwrap(),
+      borsh::to_vec(&signed_2).unwrap(),
     ));
     verify_tendermint_tx::<N>(&tx, &validators, commit).unwrap_err();
   }
@@ -273,8 +287,8 @@ async fn conflicting_msgs_evidence_tx() {
     .await;
 
     let tx = TendermintTx::SlashEvidence(Evidence::ConflictingMessages(
-      signed_1.encode(),
-      signed_2.encode(),
+      borsh::to_vec(&signed_1).unwrap(),
+      borsh::to_vec(&signed_2).unwrap(),
     ));
 
     // update schema so that we don't fail due to invalid signature
@@ -293,8 +307,8 @@ async fn conflicting_msgs_evidence_tx() {
     let signed_1 = signed_for_b_r(0, 0, Data::Proposal(None, TendermintBlock(vec![]))).await;
     let signed_2 = signed_for_b_r(0, 0, Data::Prevote(None)).await;
     let tx = TendermintTx::SlashEvidence(Evidence::ConflictingMessages(
-      signed_1.encode(),
-      signed_2.encode(),
+      borsh::to_vec(&signed_1).unwrap(),
+      borsh::to_vec(&signed_2).unwrap(),
     ));
     assert!(verify_tendermint_tx::<N>(&tx, &validators, commit).is_err());
   }

coordinator/tributary-sdk/tendermint/Cargo.toml

@@ -21,7 +21,7 @@ thiserror = { version = "2", default-features = false, features = ["std"] }
 hex = { version = "0.4", default-features = false, features = ["std"] }
 log = { version = "0.4", default-features = false, features = ["std"] }
 
-parity-scale-codec = { version = "3", default-features = false, features = ["std", "derive"] }
+borsh = { version = "1", default-features = false, features = ["std", "derive", "de_strict_order"] }
 
 futures-util = { version = "0.3", default-features = false, features = ["std", "async-await-macro", "sink", "channel"] }
 futures-channel = { version = "0.3", default-features = false, features = ["std", "sink"] }

coordinator/tributary-sdk/tendermint/src/ext.rs

@@ -3,33 +3,41 @@ use std::{sync::Arc, collections::HashSet};
 
 use thiserror::Error;
 
-use parity_scale_codec::{Encode, Decode};
+use borsh::{BorshSerialize, BorshDeserialize};
 
 use crate::{SignedMessageFor, SlashEvent, commit_msg};
 
 /// An alias for a series of traits required for a type to be usable as a validator ID,
 /// automatically implemented for all types satisfying those traits.
 pub trait ValidatorId:
-  Send + Sync + Clone + Copy + PartialEq + Eq + Hash + Debug + Encode + Decode
+  Send + Sync + Clone + Copy + PartialEq + Eq + Hash + Debug + BorshSerialize + BorshDeserialize
 {
 }
-impl<V: Send + Sync + Clone + Copy + PartialEq + Eq + Hash + Debug + Encode + Decode> ValidatorId
-  for V
+#[rustfmt::skip]
+impl<
+    V: Send + Sync + Clone + Copy + PartialEq + Eq + Hash + Debug + BorshSerialize + BorshDeserialize,
+  > ValidatorId for V
 {
 }
 
 /// An alias for a series of traits required for a type to be usable as a signature,
 /// automatically implemented for all types satisfying those traits.
-pub trait Signature: Send + Sync + Clone + PartialEq + Eq + Debug + Encode + Decode {}
-impl<S: Send + Sync + Clone + PartialEq + Eq + Debug + Encode + Decode> Signature for S {}
+pub trait Signature:
+  Send + Sync + Clone + PartialEq + Eq + Debug + BorshSerialize + BorshDeserialize
+{
+}
+impl<S: Send + Sync + Clone + PartialEq + Eq + Debug + BorshSerialize + BorshDeserialize> Signature
+  for S
+{
+}
 
 // Type aliases which are distinct according to the type system
 
 /// A struct containing a Block Number, wrapped to have a distinct type.
-#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, Encode, Decode)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, BorshSerialize, BorshDeserialize)]
 pub struct BlockNumber(pub u64);
 /// A struct containing a round number, wrapped to have a distinct type.
-#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, Encode, Decode)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, BorshSerialize, BorshDeserialize)]
 pub struct RoundNumber(pub u32);
 
 /// A signer for a validator.
@@ -127,7 +135,7 @@ impl<S: SignatureScheme> SignatureScheme for Arc<S> {
 /// A commit for a specific block.
 ///
 /// The list of validators have weight exceeding the threshold for a valid commit.
-#[derive(PartialEq, Debug, Encode, Decode)]
+#[derive(PartialEq, Debug, BorshSerialize, BorshDeserialize)]
 pub struct Commit<S: SignatureScheme> {
   /// End time of the round which created this commit, used as the start time of the next block.
   pub end_time: u64,
@@ -185,7 +193,7 @@ impl<W: Weights> Weights for Arc<W> {
 }
 
 /// Simplified error enum representing a block's validity.
-#[derive(Clone, Copy, PartialEq, Eq, Debug, Error, Encode, Decode)]
+#[derive(Clone, Copy, PartialEq, Eq, Debug, Error, BorshSerialize, BorshDeserialize)]
 pub enum BlockError {
   /// Malformed block which is wholly invalid.
   #[error("invalid block")]
@@ -197,9 +205,20 @@ pub enum BlockError {
 }
 
 /// Trait representing a Block.
-pub trait Block: Send + Sync + Clone + PartialEq + Eq + Debug + Encode + Decode {
+pub trait Block:
+  Send + Sync + Clone + PartialEq + Eq + Debug + BorshSerialize + BorshDeserialize
+{
   // Type used to identify blocks. Presumably a cryptographic hash of the block.
-  type Id: Send + Sync + Copy + Clone + PartialEq + Eq + AsRef<[u8]> + Debug + Encode + Decode;
+  type Id: Send
+    + Sync
+    + Copy
+    + Clone
+    + PartialEq
+    + Eq
+    + AsRef<[u8]>
+    + Debug
+    + BorshSerialize
+    + BorshDeserialize;
 
   /// Return the deterministic, unique ID for this block.
   fn id(&self) -> Self::Id;

coordinator/tributary-sdk/tendermint/src/lib.rs

@@ -6,7 +6,7 @@ use std::{
   collections::{VecDeque, HashMap},
 };
 
-use parity_scale_codec::{Encode, Decode, IoReader};
+use borsh::{BorshSerialize, BorshDeserialize};
 
 use futures_channel::mpsc;
 use futures_util::{
@@ -41,14 +41,14 @@ pub fn commit_msg(end_time: u64, id: &[u8]) -> Vec<u8> {
   [&end_time.to_le_bytes(), id].concat()
 }
 
-#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, Encode, Decode)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, BorshSerialize, BorshDeserialize)]
 pub enum Step {
   Propose,
   Prevote,
   Precommit,
 }
 
-#[derive(Clone, Eq, Debug, Encode, Decode)]
+#[derive(Clone, Eq, Debug, BorshSerialize, BorshDeserialize)]
 pub enum Data<B: Block, S: Signature> {
   Proposal(Option<RoundNumber>, B),
   Prevote(Option<B::Id>),
@@ -90,7 +90,7 @@ impl<B: Block, S: Signature> Data<B, S> {
   }
 }
 
-#[derive(Clone, PartialEq, Eq, Debug, Encode, Decode)]
+#[derive(Clone, PartialEq, Eq, Debug, BorshSerialize, BorshDeserialize)]
 pub struct Message<V: ValidatorId, B: Block, S: Signature> {
   pub sender: V,
   pub block: BlockNumber,
@@ -100,7 +100,7 @@ pub struct Message<V: ValidatorId, B: Block, S: Signature> {
 }
 
 /// A signed Tendermint consensus message to be broadcast to the other validators.
-#[derive(Clone, PartialEq, Eq, Debug, Encode, Decode)]
+#[derive(Clone, PartialEq, Eq, Debug, BorshSerialize, BorshDeserialize)]
 pub struct SignedMessage<V: ValidatorId, B: Block, S: Signature> {
   pub msg: Message<V, B, S>,
   pub sig: S,
@@ -117,18 +117,18 @@ impl<V: ValidatorId, B: Block, S: Signature> SignedMessage<V, B, S> {
     &self,
     signer: &Scheme,
   ) -> bool {
-    signer.verify(self.msg.sender, &self.msg.encode(), &self.sig)
+    signer.verify(self.msg.sender, &borsh::to_vec(&self.msg).unwrap(), &self.sig)
   }
 }
 
-#[derive(Clone, Copy, PartialEq, Eq, Debug, Encode, Decode)]
+#[derive(Clone, Copy, PartialEq, Eq, Debug, BorshSerialize, BorshDeserialize)]
 pub enum SlashReason {
   FailToPropose,
   InvalidBlock,
   InvalidProposer,
 }
 
-#[derive(Clone, PartialEq, Eq, Debug, Encode, Decode)]
+#[derive(Clone, PartialEq, Eq, Debug, BorshSerialize, BorshDeserialize)]
 pub enum Evidence {
   ConflictingMessages(Vec<u8>, Vec<u8>),
   InvalidPrecommit(Vec<u8>),
@@ -159,7 +159,7 @@ pub type SignedMessageFor<N> = SignedMessage<
 >;
 
 pub fn decode_signed_message<N: Network>(mut data: &[u8]) -> Option<SignedMessageFor<N>> {
-  SignedMessageFor::<N>::decode(&mut data).ok()
+  SignedMessageFor::<N>::deserialize_reader(&mut data).ok()
 }
 
 fn decode_and_verify_signed_message<N: Network>(
@@ -339,7 +339,7 @@ impl<N: Network + 'static> TendermintMachine<N> {
       target: "tendermint",
       "proposer for block {}, round {round:?} was {} (me: {res})",
       self.block.number.0,
-      hex::encode(proposer.encode()),
+      hex::encode(borsh::to_vec(&proposer).unwrap()),
     );
     res
   }
@@ -420,7 +420,11 @@ impl<N: Network + 'static> TendermintMachine<N> {
     // TODO: If the new slash event has evidence, emit to prevent a low-importance slash from
     // cancelling emission of high-importance slashes
     if !self.block.slashes.contains(&validator) {
-      log::info!(target: "tendermint", "Slashing validator {}", hex::encode(validator.encode()));
+      log::info!(
+        target: "tendermint",
+        "Slashing validator {}",
+        hex::encode(borsh::to_vec(&validator).unwrap()),
+      );
       self.block.slashes.insert(validator);
       self.network.slash(validator, slash_event).await;
     }
@@ -670,7 +674,7 @@ impl<N: Network + 'static> TendermintMachine<N> {
           self
             .slash(
               msg.sender,
-              SlashEvent::WithEvidence(Evidence::InvalidPrecommit(signed.encode())),
+              SlashEvent::WithEvidence(Evidence::InvalidPrecommit(borsh::to_vec(&signed).unwrap())),
             )
             .await;
           Err(TendermintError::Malicious)?;
@@ -741,7 +745,10 @@ impl<N: Network + 'static> TendermintMachine<N> {
           self.broadcast(Data::Prevote(None));
         }
         self
-          .slash(msg.sender, SlashEvent::WithEvidence(Evidence::InvalidValidRound(msg.encode())))
+          .slash(
+            msg.sender,
+            SlashEvent::WithEvidence(Evidence::InvalidValidRound(borsh::to_vec(&msg).unwrap())),
+          )
           .await;
         Err(TendermintError::Malicious)?;
       }
@@ -1032,7 +1039,7 @@ impl<N: Network + 'static> TendermintMachine<N> {
 
           while !messages.is_empty() {
             self.network.broadcast(
-              SignedMessageFor::<N>::decode(&mut IoReader(&mut messages))
+              SignedMessageFor::<N>::deserialize_reader(&mut messages)
                 .expect("saved invalid message to DB")
             ).await;
           }
@@ -1057,7 +1064,7 @@ impl<N: Network + 'static> TendermintMachine<N> {
       } {
         if our_message {
           assert!(sig.is_none());
-          sig = Some(self.signer.sign(&msg.encode()).await);
+          sig = Some(self.signer.sign(&borsh::to_vec(&msg).unwrap()).await);
         }
         let sig = sig.unwrap();
 
@@ -1077,7 +1084,7 @@ impl<N: Network + 'static> TendermintMachine<N> {
           let message_tape_key = message_tape_key(self.genesis);
           let mut txn = self.db.txn();
           let mut message_tape = txn.get(&message_tape_key).unwrap_or(vec![]);
-          message_tape.extend(signed_msg.encode());
+          signed_msg.serialize(&mut message_tape).unwrap();
           txn.put(&message_tape_key, message_tape);
           txn.commit();
         }

coordinator/tributary-sdk/tendermint/src/message_log.rs

@@ -1,7 +1,5 @@
 use std::{sync::Arc, collections::HashMap};
 
-use parity_scale_codec::Encode;
-
 use crate::{ext::*, RoundNumber, Step, DataFor, SignedMessageFor, Evidence};
 
 type RoundLog<N> = HashMap<<N as Network>::ValidatorId, HashMap<Step, SignedMessageFor<N>>>;
@@ -39,7 +37,10 @@ impl<N: Network> MessageLog<N> {
           target: "tendermint",
           "Validator sent multiple messages for the same block + round + step"
         );
-        Err(Evidence::ConflictingMessages(existing.encode(), signed.encode()))?;
+        Err(Evidence::ConflictingMessages(
+          borsh::to_vec(&existing).unwrap(),
+          borsh::to_vec(&signed).unwrap(),
+        ))?;
       }
       return Ok(false);
     }

coordinator/tributary-sdk/tendermint/tests/ext.rs

@@ -4,7 +4,7 @@ use std::{
   time::{UNIX_EPOCH, SystemTime, Duration},
 };
 
-use parity_scale_codec::{Encode, Decode};
+use borsh::{BorshSerialize, BorshDeserialize};
 
 use futures_util::sink::SinkExt;
 use tokio::{sync::RwLock, time::sleep};
@@ -89,7 +89,7 @@ impl Weights for TestWeights {
   }
 }
 
-#[derive(Clone, PartialEq, Eq, Debug, Encode, Decode)]
+#[derive(Clone, PartialEq, Eq, Debug, BorshSerialize, BorshDeserialize)]
 struct TestBlock {
   id: TestBlockId,
   valid: Result<(), BlockError>,

coordinator/tributary/Cargo.toml

@@ -21,7 +21,6 @@ workspace = true
 zeroize = { version = "^1.5", default-features = false, features = ["std"] }
 rand_core = { version = "0.6", default-features = false, features = ["std"] }
 
-scale = { package = "parity-scale-codec", version = "3", default-features = false, features = ["std", "derive"] }
 borsh = { version = "1", default-features = false, features = ["std", "derive", "de_strict_order"] }
 
 blake2 = { version = "0.11.0-rc.0", default-features = false, features = ["alloc"] }
@@ -30,7 +29,7 @@ dalek-ff-group = { path = "../../crypto/dalek-ff-group", default-features = fals
 dkg = { path = "../../crypto/dkg", default-features = false, features = ["std"] }
 schnorr = { package = "schnorr-signatures", path = "../../crypto/schnorr", default-features = false, features = ["std"] }
 
-serai-client = { path = "../../substrate/client", default-features = false, features = ["serai"] }
+serai-primitives = { path = "../../substrate/primitives", default-features = false, features = ["std"] }
 
 serai-db = { path = "../../common/db" }
 serai-task = { path = "../../common/task", version = "0.1" }

coordinator/tributary/src/db.rs

@@ -1,9 +1,8 @@
 use std::collections::HashMap;
 
-use scale::Encode;
 use borsh::{BorshSerialize, BorshDeserialize};
 
-use serai_client::{primitives::SeraiAddress, validator_sets::primitives::ExternalValidatorSet};
+use serai_primitives::{address::SeraiAddress, validator_sets::primitives::ExternalValidatorSet};
 
 use messages::sign::{VariantSignId, SignId};
 
@@ -14,7 +13,7 @@ use serai_cosign::CosignIntent;
 use crate::transaction::SigningProtocolRound;
 
 /// A topic within the database which the group participates in
-#[derive(Clone, Copy, PartialEq, Eq, Debug, Encode, BorshSerialize, BorshDeserialize)]
+#[derive(Clone, Copy, PartialEq, Eq, Debug, BorshSerialize, BorshDeserialize)]
 pub enum Topic {
   /// Vote to remove a participant
   RemoveParticipant {
@@ -123,7 +122,7 @@ impl Topic {
       Topic::DkgConfirmation { attempt, round: _ } => Some({
         let id = {
           let mut id = [0; 32];
-          let encoded_set = set.encode();
+          let encoded_set = borsh::to_vec(set).unwrap();
           id[.. encoded_set.len()].copy_from_slice(&encoded_set);
           VariantSignId::Batch(id)
         };

coordinator/tributary/src/lib.rs

@@ -8,9 +8,9 @@ use std::collections::HashMap;
 use ciphersuite::group::GroupEncoding;
 use dkg::Participant;
 
-use serai_client::{
-  primitives::SeraiAddress,
-  validator_sets::primitives::{ExternalValidatorSet, Slash},
+use serai_primitives::{
+  address::SeraiAddress,
+  validator_sets::{ExternalValidatorSet, Slash},
 };
 
 use serai_db::*;

coordinator/tributary/src/transaction.rs

@@ -12,10 +12,9 @@ use ciphersuite::{
 use dalek_ff_group::Ristretto;
 use schnorr::SchnorrSignature;
 
-use scale::Encode;
 use borsh::{BorshSerialize, BorshDeserialize};
 
-use serai_client::{primitives::SeraiAddress, validator_sets::primitives::MAX_KEY_SHARES_PER_SET};
+use serai_primitives::{addess::SeraiAddress, validator_sets::MAX_KEY_SHARES_PER_SET};
 
 use messages::sign::VariantSignId;
 
@@ -29,7 +28,7 @@ use tributary_sdk::{
 use crate::db::Topic;
 
 /// The round this data is for, within a signing protocol.
-#[derive(Clone, Copy, PartialEq, Eq, Debug, Encode, BorshSerialize, BorshDeserialize)]
+#[derive(Clone, Copy, PartialEq, Eq, Debug, BorshSerialize, BorshDeserialize)]
 pub enum SigningProtocolRound {
   /// A preprocess.
   Preprocess,
@@ -242,19 +241,20 @@ impl TransactionTrait for Transaction {
   fn kind(&self) -> TransactionKind {
     match self {
       Transaction::RemoveParticipant { participant, signed } => TransactionKind::Signed(
-        (b"RemoveParticipant", participant).encode(),
+        borsh::to_vec(&(b"RemoveParticipant".as_slice(), participant)).unwrap(),
         signed.to_tributary_signed(0),
       ),
 
-      Transaction::DkgParticipation { signed, .. } => {
-        TransactionKind::Signed(b"DkgParticipation".encode(), signed.to_tributary_signed(0))
-      }
+      Transaction::DkgParticipation { signed, .. } => TransactionKind::Signed(
+        borsh::to_vec(b"DkgParticipation".as_slice()).unwrap(),
+        signed.to_tributary_signed(0),
+      ),
       Transaction::DkgConfirmationPreprocess { attempt, signed, .. } => TransactionKind::Signed(
-        (b"DkgConfirmation", attempt).encode(),
+        borsh::to_vec(b"DkgConfirmation".as_slice(), attempt).unwrap(),
         signed.to_tributary_signed(0),
       ),
       Transaction::DkgConfirmationShare { attempt, signed, .. } => TransactionKind::Signed(
-        (b"DkgConfirmation", attempt).encode(),
+        borsh::to_vec(b"DkgConfirmation".as_slice(), attempt).unwrap(),
         signed.to_tributary_signed(1),
       ),
 
@@ -264,13 +264,14 @@ impl TransactionTrait for Transaction {
       Transaction::Batch { .. } => TransactionKind::Provided("Batch"),
 
       Transaction::Sign { id, attempt, round, signed, .. } => TransactionKind::Signed(
-        (b"Sign", id, attempt).encode(),
+        borsh::to_vec(b"Sign".as_slice(), id, attempt).unwrap(),
         signed.to_tributary_signed(round.nonce()),
       ),
 
-      Transaction::SlashReport { signed, .. } => {
-        TransactionKind::Signed(b"SlashReport".encode(), signed.to_tributary_signed(0))
-      }
+      Transaction::SlashReport { signed, .. } => TransactionKind::Signed(
+        borsh::to_vec(b"SlashReport".as_slice()).unwrap(),
+        signed.to_tributary_signed(0),
+      ),
     }
   }
 

deny.toml

@@ -133,5 +133,5 @@ allow-git = [
   "https://github.com/kayabaNerve/hybrid-array",
   "https://github.com/kayabaNerve/elliptic-curves",
   "https://github.com/monero-oxide/monero-oxide",
-  "https://github.com/serai-dex/polkadot-sdk",
+  "https://github.com/serai-dex/patch-polkadot-sdk",
 ]

message-queue/src/main.rs

@@ -7,7 +7,7 @@ use dalek_ff_group::Ristretto;
 pub(crate) use ciphersuite::{group::GroupEncoding, Ciphersuite};
 pub(crate) use schnorr_signatures::SchnorrSignature;
 
-pub(crate) use serai_primitives::ExternalNetworkId;
+pub(crate) use serai_primitives::network_id::ExternalNetworkId;
 
 pub(crate) use tokio::{
   io::{AsyncReadExt, AsyncWriteExt},
@@ -198,7 +198,7 @@ async fn main() {
     KEYS.write().unwrap().insert(service, key);
     let mut queues = QUEUES.write().unwrap();
     if service == Service::Coordinator {
-      for network in serai_primitives::EXTERNAL_NETWORKS {
+      for network in ExternalNetworkId::all() {
         queues.insert(
           (service, Service::Processor(network)),
           RwLock::new(Queue(db.clone(), service, Service::Processor(network))),
@@ -213,12 +213,13 @@ async fn main() {
   };
 
   // Make queues for each ExternalNetworkId
-  for network in serai_primitives::EXTERNAL_NETWORKS {
+  for network in ExternalNetworkId::all() {
     // Use a match so we error if the list of NetworkIds changes
     let Some(key) = read_key(match network {
       ExternalNetworkId::Bitcoin => "BITCOIN_KEY",
       ExternalNetworkId::Ethereum => "ETHEREUM_KEY",
       ExternalNetworkId::Monero => "MONERO_KEY",
+      _ => panic!("unrecognized network"),
     }) else {
       continue;
     };

message-queue/src/messages.rs

@@ -4,7 +4,7 @@ use ciphersuite::{group::GroupEncoding, Ciphersuite};
 
 use borsh::{BorshSerialize, BorshDeserialize};
 
-use serai_primitives::ExternalNetworkId;
+use serai_primitives::network_id::ExternalNetworkId;
 
 #[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, BorshSerialize, BorshDeserialize)]
 pub enum Service {

processor/bin/Cargo.toml

@@ -20,14 +20,13 @@ workspace = true
 zeroize = { version = "1", default-features = false, features = ["std"] }
 
 hex = { version = "0.4", default-features = false, features = ["std"] }
-scale = { package = "parity-scale-codec", version = "3", default-features = false, features = ["std"] }
 borsh = { version = "1", default-features = false, features = ["std", "derive", "de_strict_order"] }
 
 ciphersuite = { path = "../../crypto/ciphersuite", default-features = false, features = ["std"] }
 dkg = { package = "dkg-evrf", path = "../../crypto/dkg/evrf", default-features = false, features = ["std", "ristretto"] }
 
-serai-client = { path = "../../substrate/client", default-features = false }
-serai-cosign = { path = "../../coordinator/cosign" }
+serai-primitives = { path = "../../substrate/primitives", default-features = false, features = ["std"] }
+serai-cosign = { package = "serai-cosign-types", path = "../../coordinator/cosign/types" }
 
 log = { version = "0.4", default-features = false, features = ["std"] }
 env_logger = { version = "0.10", default-features = false, features = ["humantime"] }

processor/bin/src/coordinator.rs

@@ -3,10 +3,10 @@ use std::sync::{LazyLock, Arc, Mutex};
 
 use tokio::sync::mpsc;
 
-use serai_client::{
-  primitives::Signature,
-  validator_sets::primitives::{Session, SlashReport},
-  in_instructions::primitives::SignedBatch,
+use serai_primitives::{
+  crypto::Signature,
+  validator_sets::{Session, SlashReport},
+  instructions::SignedBatch,
 };
 
 use serai_cosign::SignedCosign;

processor/bin/src/lib.rs

@@ -8,7 +8,7 @@ use ciphersuite::{
 };
 use dkg::{Curves, Ristretto};
 
-use serai_client::validator_sets::primitives::Session;
+use serai_primitives::validator_sets::Session;
 
 use serai_env as env;
 use serai_db::{Get, DbTxn, Db as DbTrait, create_db, db_channel};

processor/bitcoin/Cargo.toml

@@ -20,7 +20,6 @@ workspace = true
 rand_core = { version = "0.6", default-features = false }
 
 hex = { version = "0.4", default-features = false, features = ["std"] }
-scale = { package = "parity-scale-codec", version = "3", default-features = false, features = ["std"] }
 borsh = { version = "1", default-features = false, features = ["std", "derive", "de_strict_order"] }
 
 ciphersuite = { path = "../../crypto/ciphersuite", default-features = false, features = ["std"] }

processor/bitcoin/src/primitives/output.rs

@@ -10,12 +10,15 @@ use bitcoin_serai::{
   wallet::ReceivedOutput as WalletOutput,
 };
 
-use scale::{Encode, Decode, IoReader};
 use borsh::{BorshSerialize, BorshDeserialize};
 use serai_db::Get;
 
 use serai_client::{
-  primitives::{ExternalCoin, Amount, ExternalBalance, ExternalAddress},
+  primitives::{
+    coin::ExternalCoin,
+    balance::{Amount, ExternalBalance},
+    address::ExternalAddress,
+  },
   networks::bitcoin::Address,
 };
 
@@ -26,7 +29,7 @@ use crate::{
   scan::{offsets_for_key, presumed_origin, extract_serai_data},
 };
 
-#[derive(Clone, PartialEq, Eq, Hash, Debug, Encode, Decode, BorshSerialize, BorshDeserialize)]
+#[derive(Clone, PartialEq, Eq, Hash, Debug, BorshSerialize, BorshDeserialize)]
 pub(crate) struct OutputId([u8; 36]);
 impl Default for OutputId {
   fn default() -> Self {
@@ -139,7 +142,7 @@ impl ReceivedOutput<<Secp256k1 as Ciphersuite>::G, Address> for Output {
   fn write<W: io::Write>(&self, writer: &mut W) -> io::Result<()> {
     self.kind.write(writer)?;
     let presumed_origin: Option<ExternalAddress> = self.presumed_origin.clone().map(Into::into);
-    writer.write_all(&presumed_origin.encode())?;
+    presumed_origin.serialize(writer)?;
     self.output.write(writer)?;
     writer.write_all(&u16::try_from(self.data.len()).unwrap().to_le_bytes())?;
     writer.write_all(&self.data)
@@ -149,7 +152,7 @@ impl ReceivedOutput<<Secp256k1 as Ciphersuite>::G, Address> for Output {
     Ok(Output {
       kind: OutputType::read(reader)?,
       presumed_origin: {
-        Option::<ExternalAddress>::decode(&mut IoReader(&mut reader))
+        Option::<ExternalAddress>::deserialize_reader(&mut reader)
           .map_err(|e| io::Error::other(format!("couldn't decode ExternalAddress: {e:?}")))?
           .map(|address| {
             Address::try_from(address)

processor/bitcoin/src/rpc.rs

@@ -2,7 +2,7 @@ use core::future::Future;
 
 use bitcoin_serai::rpc::{RpcError, Rpc as BRpc};
 
-use serai_client::primitives::{ExternalNetworkId, ExternalCoin, Amount};
+use serai_client::primitives::{network_id::ExternalNetworkId, coin::ExternalCoin, balance::Amount};
 
 use serai_db::Db;
 use scanner::ScannerFeed;

processor/bitcoin/src/scheduler.rs

@@ -9,7 +9,7 @@ use bitcoin_serai::{
 };
 
 use serai_client::{
-  primitives::{ExternalCoin, Amount},
+  primitives::{coin::ExternalCoin, balance::Amount},
   networks::bitcoin::Address,
 };
 

processor/ethereum/Cargo.toml

@@ -21,7 +21,6 @@ rand_core = { version = "0.6", default-features = false }
 
 const-hex = { version = "1", default-features = false, features = ["std"] }
 hex = { version = "0.4", default-features = false, features = ["std"] }
-scale = { package = "parity-scale-codec", version = "3", default-features = false, features = ["std"] }
 borsh = { version = "1", default-features = false, features = ["std", "derive", "de_strict_order"] }
 
 ciphersuite = { path = "../../crypto/ciphersuite", default-features = false, features = ["std"] }

processor/ethereum/router/Cargo.toml

@@ -41,7 +41,6 @@ ethereum-primitives = { package = "serai-processor-ethereum-primitives", path =
 ethereum-deployer = { package = "serai-processor-ethereum-deployer", path = "../deployer", default-features = false }
 erc20 = { package = "serai-processor-ethereum-erc20", path = "../erc20", default-features = false }
 
-scale = { package = "parity-scale-codec", version = "3", default-features = false, features = ["std"] }
 serai-client = { path = "../../../substrate/client", default-features = false, features = ["ethereum"] }
 
 futures-util = { version = "0.3", default-features = false, features = ["std"] }

processor/ethereum/router/contracts/IRouter.sol

@@ -19,7 +19,7 @@ interface IRouterWithoutCollisions {
   /// @param from The address which called `inInstruction` and caused this event to be emitted
   /// @param coin The coin transferred in
   /// @param amount The amount of the coin transferred in
-  /// @param instruction The Shorthand-encoded InInstruction for Serai to decode and handle
+  /// @param instruction The encoded `RefundableInInstruction` for Serai to decode and handle
   event InInstruction(
     address indexed from, address indexed coin, uint256 amount, bytes instruction
   );
@@ -81,8 +81,8 @@ interface IRouterWithoutCollisions {
   /// @param coin The coin to transfer in (address(0) if Ether)
   /// @param amount The amount to transfer in (msg.value if Ether)
   /**
-   * @param instruction The Shorthand-encoded InInstruction for Serai to associate with this
-   *   transfer in
+   * @param instruction The encoded `RefundableInInstruction` for Serai to associate with this
+   *  transfer in
    */
   // Re-entrancy doesn't bork this function
   // slither-disable-next-line reentrancy-events

processor/ethereum/router/contracts/Router.sol

@@ -293,7 +293,7 @@ contract Router is IRouterWithoutCollisions {
   /// @param coin The coin to transfer in (address(0) if Ether)
   /// @param amount The amount to transfer in (msg.value if Ether)
   /**
-   * @param instruction The Shorthand-encoded InInstruction for Serai to associate with this
+   * @param instruction The encoded `RefundableInInstruction` for Serai to associate with this
    *  transfer in
    */
   // This function doesn't require nonReentrant as re-entrancy isn't an issue with this function

processor/ethereum/router/src/lib.rs

@@ -21,9 +21,8 @@ use alloy_rpc_types_eth::{BlockId, Log, Filter, TransactionInput, TransactionReq
 use alloy_transport::{TransportErrorKind, RpcError};
 use alloy_provider::{Provider, RootProvider};
 
-use scale::Encode;
 use serai_client::{
-  in_instructions::primitives::Shorthand, networks::ethereum::Address as SeraiAddress,
+  primitives::instructions::RefundableInInstruction, networks::ethereum::Address as SeraiAddress,
 };
 
 use ethereum_primitives::LogIndex;
@@ -351,20 +350,29 @@ impl Router {
     }
   }
 
-  /// Construct a transaction to send coins with an InInstruction to Serai.
+  /// Construct a transaction to send coins with an `InInstruction` to Serai.
   ///
   /// If coin is an ERC20, this will not create a transaction calling the Router but will create a
   /// top-level transfer of the ERC20 to the Router. This avoids needing to call `approve` before
   /// publishing the transaction calling the Router.
   ///
   /// The gas limit and gas price are not set and are left to the caller.
-  pub fn in_instruction(&self, coin: Coin, amount: U256, in_instruction: &Shorthand) -> TxLegacy {
+  pub fn in_instruction(
+    &self,
+    coin: Coin,
+    amount: U256,
+    in_instruction: &RefundableInInstruction,
+  ) -> TxLegacy {
     match coin {
       Coin::Ether => TxLegacy {
         to: self.address.into(),
-        input: abi::inInstructionCall::new((coin.into(), amount, in_instruction.encode().into()))
-          .abi_encode()
-          .into(),
+        input: abi::inInstructionCall::new((
+          coin.into(),
+          amount,
+          borsh::to_vec(&in_instruction).unwrap().into(),
+        ))
+        .abi_encode()
+        .into(),
         value: amount,
         ..Default::default()
       },
@@ -373,7 +381,7 @@ impl Router {
         input: erc20::transferWithInInstructionCall::new((
           self.address,
           amount,
-          in_instruction.encode().into(),
+          borsh::to_vec(&in_instruction).unwrap().into(),
         ))
         .abi_encode()
         .into(),

processor/ethereum/router/src/tests/in_instruction.rs

@@ -5,12 +5,9 @@ use alloy_sol_types::SolCall;
 
 use alloy_consensus::{TxLegacy, Signed};
 
-use scale::Encode;
 use serai_client::{
   primitives::SeraiAddress,
-  in_instructions::primitives::{
-    InInstruction as SeraiInInstruction, RefundableInInstruction, Shorthand,
-  },
+  primitives::instructions::{InInstruction as SeraiInInstruction, RefundableInInstruction},
 };
 
 use ethereum_primitives::LogIndex;
@@ -18,14 +15,14 @@ use ethereum_primitives::LogIndex;
 use crate::{InInstruction, tests::*};
 
 impl Test {
-  pub(crate) fn in_instruction() -> Shorthand {
-    Shorthand::Raw(RefundableInInstruction {
+  pub(crate) fn in_instruction() -> RefundableInInstruction {
+    RefundableInInstruction {
       origin: None,
       instruction: SeraiInInstruction::Transfer(SeraiAddress([0xff; 32])),
-    })
+    }
   }
 
-  pub(crate) fn eth_in_instruction_tx(&self) -> (Coin, U256, Shorthand, TxLegacy) {
+  pub(crate) fn eth_in_instruction_tx(&self) -> (Coin, U256, RefundableInInstruction, TxLegacy) {
     let coin = Coin::Ether;
     let amount = U256::from(1);
     let shorthand = Self::in_instruction();
@@ -42,7 +39,7 @@ impl Test {
     tx: Signed<TxLegacy>,
     coin: Coin,
     amount: U256,
-    shorthand: &Shorthand,
+    shorthand: &RefundableInInstruction,
   ) {
     let receipt = ethereum_test_primitives::publish_tx(&self.provider, tx.clone()).await;
     assert!(receipt.status());
@@ -81,7 +78,7 @@ impl Test {
         from: tx.recover_signer().unwrap(),
         coin,
         amount,
-        data: shorthand.encode(),
+        data: borsh::to_vec(&shorthand).unwrap(),
       }
     );
   }
@@ -140,9 +137,13 @@ async fn test_erc20_router_in_instruction() {
     gas_limit: 1_000_000,
     to: test.router.address().into(),
     value: U256::ZERO,
-    input: crate::abi::inInstructionCall::new((coin.into(), amount, shorthand.encode().into()))
-      .abi_encode()
-      .into(),
+    input: crate::abi::inInstructionCall::new((
+      coin.into(),
+      amount,
+      borsh::to_vec(shorthand).unwrap().into(),
+    ))
+    .abi_encode()
+    .into(),
   };
 
   // If no `approve` was granted, this should fail

processor/ethereum/src/main.rs

@@ -14,7 +14,7 @@ use alloy_simple_request_transport::SimpleRequest;
 use alloy_rpc_client::ClientBuilder;
 use alloy_provider::{Provider, RootProvider};
 
-use serai_client::validator_sets::primitives::Session;
+use serai_client::primitives::validator_sets::Session;
 
 use serai_env as env;
 use serai_db::{Get, DbTxn, create_db};

processor/ethereum/src/primitives/mod.rs

@@ -1,6 +1,6 @@
 use alloy_core::primitives::{FixedBytes, Address};
 
-use serai_client::primitives::Amount;
+use serai_client::primitives::balance::Amount;
 
 pub(crate) mod output;
 pub(crate) mod transaction;

processor/ethereum/src/primitives/output.rs

@@ -5,11 +5,14 @@ use ciphersuite_kp256::Secp256k1;
 
 use alloy_core::primitives::U256;
 
-use scale::{Encode, Decode};
 use borsh::{BorshSerialize, BorshDeserialize};
 
 use serai_client::{
-  primitives::{ExternalNetworkId, ExternalCoin, Amount, ExternalBalance},
+  primitives::{
+    network_id::ExternalNetworkId,
+    coin::ExternalCoin,
+    balance::{Amount, ExternalBalance},
+  },
   networks::ethereum::Address,
 };
 
@@ -39,9 +42,7 @@ fn amount_to_serai_amount(coin: ExternalCoin, amount: U256) -> Amount {
   Amount(u64::try_from(amount / divisor).unwrap())
 }
 
-#[derive(
-  Clone, Copy, PartialEq, Eq, Hash, Debug, Encode, Decode, BorshSerialize, BorshDeserialize,
-)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, BorshSerialize, BorshDeserialize)]
 pub(crate) struct OutputId(pub(crate) [u8; 40]);
 impl Default for OutputId {
   fn default() -> Self {

processor/ethereum/src/rpc.rs

@@ -6,7 +6,7 @@ use alloy_rpc_types_eth::{Header, BlockNumberOrTag};
 use alloy_transport::{RpcError, TransportErrorKind};
 use alloy_provider::{Provider, RootProvider};
 
-use serai_client::primitives::{ExternalNetworkId, ExternalCoin, Amount};
+use serai_client::primitives::{network_id::ExternalNetworkId, coin::ExternalCoin, balance::Amount};
 
 use tokio::task::JoinSet;
 

processor/ethereum/src/scheduler.rs

@@ -3,7 +3,7 @@ use std::collections::HashMap;
 use alloy_core::primitives::U256;
 
 use serai_client::{
-  primitives::{ExternalNetworkId, ExternalCoin, ExternalBalance},
+  primitives::{network_id::ExternalNetworkId, coin::ExternalCoin, balance::ExternalBalance},
   networks::ethereum::Address,
 };
 

processor/frost-attempt-manager/Cargo.toml

@@ -15,7 +15,7 @@ all-features = true
 rustdoc-args = ["--cfg", "docsrs"]
 
 [package.metadata.cargo-machete]
-ignored = ["borsh", "scale"]
+ignored = ["borsh"]
 
 [lints]
 workspace = true
@@ -29,7 +29,6 @@ serai-primitives = { path = "../../substrate/primitives", default-features = fal
 
 log = { version = "0.4", default-features = false, features = ["std"] }
 
-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-db = { path = "../../common/db" }
 

processor/frost-attempt-manager/src/individual.rs

@@ -7,7 +7,7 @@ use frost::{
   sign::{Writable, PreprocessMachine, SignMachine, SignatureMachine},
 };
 
-use serai_validator_sets_primitives::Session;
+use serai_primitives::validator_sets::Session;
 
 use serai_db::{Get, DbTxn, Db, create_db};
 use messages::sign::{VariantSignId, SignId, ProcessorMessage};

processor/frost-attempt-manager/src/lib.rs

@@ -6,7 +6,7 @@ use std::collections::HashMap;
 
 use frost::{Participant, sign::PreprocessMachine};
 
-use serai_validator_sets_primitives::Session;
+use serai_primitives::validator_sets::Session;
 
 use serai_db::{DbTxn, Db};
 use messages::sign::{VariantSignId, ProcessorMessage, CoordinatorMessage};

processor/key-gen/Cargo.toml

@@ -14,9 +14,6 @@ rust-version = "1.89"
 all-features = true
 rustdoc-args = ["--cfg", "docsrs"]
 
-[package.metadata.cargo-machete]
-ignored = ["scale"]
-
 [lints]
 workspace = true
 
@@ -38,7 +35,6 @@ dkg = { package = "dkg-evrf", path = "../../crypto/dkg/evrf", default-features =
 serai-primitives = { path = "../../substrate/primitives", default-features = false, features = ["std"] }
 
 # Encoders
-scale = { package = "parity-scale-codec", version = "3", default-features = false, features = ["std"] }
 borsh = { version = "1", default-features = false, features = ["std", "derive", "de_strict_order"] }
 
 # Application

processor/key-gen/src/db.rs

@@ -6,7 +6,7 @@ use zeroize::Zeroizing;
 use ciphersuite::{group::GroupEncoding, Ciphersuite};
 use dkg::*;
 
-use serai_validator_sets_primitives::Session;
+use serai_primitives::validator_sets::Session;
 
 use borsh::{BorshSerialize, BorshDeserialize};
 use serai_db::{Get, DbTxn};
@@ -36,7 +36,7 @@ pub(crate) struct Participations {
 }
 
 mod _db {
-  use serai_validator_sets_primitives::Session;
+  use serai_primitives::validator_sets::Session;
 
   use serai_db::{Get, DbTxn, create_db};
 

processor/key-gen/src/generators.rs

@@ -6,7 +6,7 @@ use std::{
 
 use dkg::*;
 
-use serai_validator_sets_primitives::MAX_KEY_SHARES_PER_SET;
+use serai_primitives::constants::MAX_KEY_SHARES_PER_SET;
 
 /// A cache of the generators used by the eVRF DKG.
 ///

processor/key-gen/src/lib.rs

@@ -17,7 +17,7 @@ use ciphersuite::{
 };
 use dkg::*;
 
-use serai_validator_sets_primitives::Session;
+use serai_primitives::validator_sets::Session;
 use messages::key_gen::*;
 
 use serai_db::{Get, DbTxn};

processor/messages/Cargo.toml

@@ -20,11 +20,10 @@ workspace = true
 [dependencies]
 hex = { version = "0.4", default-features = false, features = ["std"] }
 
-scale = { package = "parity-scale-codec", version = "3", default-features = false, features = ["std"] }
 borsh = { version = "1", default-features = false, features = ["std", "derive", "de_strict_order"] }
 
 dkg = { path = "../../crypto/dkg", default-features = false, features = ["std", "borsh"] }
 
 serai-primitives = { path = "../../substrate/primitives", default-features = false, features = ["std"] }
 
-serai-cosign = { path = "../../coordinator/cosign", default-features = false }
+serai-cosign = { package = "serai-cosign-types", path = "../../coordinator/cosign/types" }

processor/messages/src/lib.rs

@@ -1,15 +1,16 @@
 use core::fmt;
 use std::collections::HashMap;
 
-use scale::{Encode, Decode};
 use borsh::{BorshSerialize, BorshDeserialize};
 
 use dkg::Participant;
 
-use serai_primitives::BlockHash;
-use validator_sets_primitives::{Session, KeyPair, SlashReport};
-use coins_primitives::OutInstructionWithBalance;
-use in_instructions_primitives::SignedBatch;
+use serai_primitives::{
+  BlockHash,
+  crypto::KeyPair,
+  validator_sets::{Session, SlashReport},
+  instructions::{SignedBatch, OutInstructionWithBalance},
+};
 
 use serai_cosign::{Cosign, SignedCosign};
 
@@ -87,7 +88,7 @@ pub mod key_gen {
 pub mod sign {
   use super::*;
 
-  #[derive(Clone, Copy, PartialEq, Eq, Hash, Encode, Decode, BorshSerialize, BorshDeserialize)]
+  #[derive(Clone, Copy, PartialEq, Eq, Hash, BorshSerialize, BorshDeserialize)]
   pub enum VariantSignId {
     Cosign(u64),
     Batch([u8; 32]),
@@ -111,9 +112,7 @@ pub mod sign {
     }
   }
 
-  #[derive(
-    Clone, Copy, PartialEq, Eq, Hash, Debug, Encode, Decode, BorshSerialize, BorshDeserialize,
-  )]
+  #[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, BorshSerialize, BorshDeserialize)]
   pub struct SignId {
     pub session: Session,
     pub id: VariantSignId,
@@ -295,7 +294,7 @@ impl CoordinatorMessage {
         let (sub, id) = match msg {
           // Unique since we only have one attempt per session
           key_gen::CoordinatorMessage::GenerateKey { session, .. } => {
-            (0, borsh::to_vec(session).unwrap())
+            (0, borsh::to_vec(&session).unwrap())
           }
           // Unique since one participation per participant per session
           key_gen::CoordinatorMessage::Participation { session, participant, .. } => {
@@ -316,17 +315,19 @@ impl CoordinatorMessage {
         };
 
         let mut res = vec![COORDINATOR_UID, TYPE_SIGN_UID, sub];
-        res.extend(id.encode());
+        res.extend(borsh::to_vec(&id).unwrap());
         res
       }
       CoordinatorMessage::Coordinator(msg) => {
         let (sub, id) = match msg {
           // We only cosign a block once, and Reattempt is a separate message
           coordinator::CoordinatorMessage::CosignSubstrateBlock { cosign, .. } => {
-            (0, cosign.block_number.encode())
+            (0, borsh::to_vec(&cosign.block_number).unwrap())
           }
           // We only sign one slash report, and Reattempt is a separate message
-          coordinator::CoordinatorMessage::SignSlashReport { session, .. } => (1, session.encode()),
+          coordinator::CoordinatorMessage::SignSlashReport { session, .. } => {
+            (1, borsh::to_vec(&session).unwrap())
+          }
         };
 
         let mut res = vec![COORDINATOR_UID, TYPE_COORDINATOR_UID, sub];
@@ -335,10 +336,14 @@ impl CoordinatorMessage {
       }
       CoordinatorMessage::Substrate(msg) => {
         let (sub, id) = match msg {
-          substrate::CoordinatorMessage::SetKeys { session, .. } => (0, session.encode()),
-          substrate::CoordinatorMessage::SlashesReported { session } => (1, session.encode()),
+          substrate::CoordinatorMessage::SetKeys { session, .. } => {
+            (0, borsh::to_vec(&session).unwrap())
+          }
+          substrate::CoordinatorMessage::SlashesReported { session } => {
+            (1, borsh::to_vec(&session).unwrap())
+          }
           substrate::CoordinatorMessage::Block { serai_block_number, .. } => {
-            (2, serai_block_number.encode())
+            (2, borsh::to_vec(&serai_block_number).unwrap())
           }
         };
 
@@ -363,10 +368,10 @@ impl ProcessorMessage {
         let (sub, id) = match msg {
           // Unique since we only have one participation per session (due to no re-attempts)
           key_gen::ProcessorMessage::Participation { session, .. } => {
-            (0, borsh::to_vec(session).unwrap())
+            (0, borsh::to_vec(&session).unwrap())
           }
           key_gen::ProcessorMessage::GeneratedKeyPair { session, .. } => {
-            (1, borsh::to_vec(session).unwrap())
+            (1, borsh::to_vec(&session).unwrap())
           }
           // Unique since we only blame a participant once (as this is fatal)
           key_gen::ProcessorMessage::Blame { session, participant } => {
@@ -382,11 +387,11 @@ impl ProcessorMessage {
         let (sub, id) = match msg {
           // Unique since we'll only fatally slash a a participant once
           sign::ProcessorMessage::InvalidParticipant { session, participant } => {
-            (0, (session, u16::from(*participant)).encode())
+            (0, borsh::to_vec(&(session, u16::from(*participant))).unwrap())
           }
           // Unique since SignId
-          sign::ProcessorMessage::Preprocesses { id, .. } => (1, id.encode()),
-          sign::ProcessorMessage::Shares { id, .. } => (2, id.encode()),
+          sign::ProcessorMessage::Preprocesses { id, .. } => (1, borsh::to_vec(&id).unwrap()),
+          sign::ProcessorMessage::Shares { id, .. } => (2, borsh::to_vec(&id).unwrap()),
         };
 
         let mut res = vec![PROCESSOR_UID, TYPE_SIGN_UID, sub];
@@ -396,10 +401,14 @@ impl ProcessorMessage {
       ProcessorMessage::Coordinator(msg) => {
         let (sub, id) = match msg {
           coordinator::ProcessorMessage::CosignedBlock { cosign } => {
-            (0, cosign.cosign.block_hash.encode())
+            (0, borsh::to_vec(&cosign.cosign.block_hash).unwrap())
+          }
+          coordinator::ProcessorMessage::SignedBatch { batch, .. } => {
+            (1, borsh::to_vec(&batch.batch.id()).unwrap())
+          }
+          coordinator::ProcessorMessage::SignedSlashReport { session, .. } => {
+            (2, borsh::to_vec(&session).unwrap())
           }
-          coordinator::ProcessorMessage::SignedBatch { batch, .. } => (1, batch.batch.id.encode()),
-          coordinator::ProcessorMessage::SignedSlashReport { session, .. } => (2, session.encode()),
         };
 
         let mut res = vec![PROCESSOR_UID, TYPE_COORDINATOR_UID, sub];
@@ -408,7 +417,9 @@ impl ProcessorMessage {
       }
       ProcessorMessage::Substrate(msg) => {
         let (sub, id) = match msg {
-          substrate::ProcessorMessage::SubstrateBlockAck { block, .. } => (0, block.encode()),
+          substrate::ProcessorMessage::SubstrateBlockAck { block, .. } => {
+            (0, borsh::to_vec(&block).unwrap())
+          }
         };
 
         let mut res = vec![PROCESSOR_UID, TYPE_SUBSTRATE_UID, sub];

processor/monero/Cargo.toml

@@ -21,7 +21,6 @@ rand_core = { version = "0.6", default-features = false }
 rand_chacha = { version = "0.3", default-features = false, features = ["std"] }
 zeroize = { version = "1", default-features = false, features = ["std"] }
 
-scale = { package = "parity-scale-codec", version = "3", default-features = false, features = ["std"] }
 borsh = { version = "1", default-features = false, features = ["std", "derive", "de_strict_order"] }
 
 ciphersuite = { path = "../../crypto/ciphersuite", default-features = false, features = ["std"] }

processor/monero/src/primitives/output.rs

@@ -5,11 +5,13 @@ use dalek_ff_group::Ed25519;
 
 use monero_wallet::WalletOutput;
 
-use scale::{Encode, Decode};
 use borsh::{BorshSerialize, BorshDeserialize};
 
 use serai_client::{
-  primitives::{ExternalCoin, Amount, ExternalBalance},
+  primitives::{
+    coin::ExternalCoin,
+    balance::{Amount, ExternalBalance},
+  },
   networks::monero::Address,
 };
 
@@ -17,10 +19,7 @@ use primitives::{OutputType, ReceivedOutput};
 
 use crate::{EXTERNAL_SUBADDRESS, BRANCH_SUBADDRESS, CHANGE_SUBADDRESS, FORWARDED_SUBADDRESS};
 
-#[rustfmt::skip]
-#[derive(
-  Clone, Copy, PartialEq, Eq, Default, Hash, Debug, Encode, Decode, BorshSerialize, BorshDeserialize,
-)]
+#[derive(Clone, Copy, PartialEq, Eq, Default, Hash, Debug, BorshSerialize, BorshDeserialize)]
 pub(crate) struct OutputId(pub(crate) [u8; 32]);
 impl AsRef<[u8]> for OutputId {
   fn as_ref(&self) -> &[u8] {

processor/monero/src/rpc.rs

@@ -3,7 +3,7 @@ use core::future::Future;
 use monero_wallet::rpc::{RpcError, Rpc as RpcTrait};
 use monero_simple_request_rpc::SimpleRequestRpc;
 
-use serai_client::primitives::{ExternalNetworkId, ExternalCoin, Amount};
+use serai_client::primitives::{network_id::ExternalNetworkId, coin::ExternalCoin, balance::Amount};
 
 use scanner::ScannerFeed;
 use signers::TransactionPublisher;

processor/monero/src/scheduler.rs

@@ -10,7 +10,7 @@ use dalek_ff_group::Ed25519;
 use monero_wallet::rpc::{FeeRate, RpcError};
 
 use serai_client::{
-  primitives::{ExternalCoin, Amount},
+  primitives::{coin::ExternalCoin, balance::Amount},
   networks::monero::Address,
 };
 

processor/primitives/Cargo.toml

@@ -22,7 +22,6 @@ group = { version = "0.13", default-features = false }
 
 serai-primitives = { path = "../../substrate/primitives", default-features = false, features = ["std"] }
 
-scale = { package = "parity-scale-codec", version = "3", default-features = false, features = ["std"] }
 borsh = { version = "1", default-features = false, features = ["std", "derive", "de_strict_order"] }
 
 log = { version = "0.4", default-features = false, features = ["std"] }

processor/primitives/src/lib.rs

@@ -6,7 +6,6 @@ use core::{hash::Hash, fmt::Debug};
 
 use group::GroupEncoding;
 
-use scale::{Encode, Decode};
 use borsh::{BorshSerialize, BorshDeserialize};
 
 /// A module for task-related structs and functionality.
@@ -40,8 +39,6 @@ pub trait Id:
   + AsRef<[u8]>
   + AsMut<[u8]>
   + Debug
-  + Encode
-  + Decode
   + BorshSerialize
   + BorshDeserialize
 {
@@ -57,22 +54,15 @@ impl<
       + AsRef<[u8]>
       + AsMut<[u8]>
       + Debug
-      + Encode
-      + Decode
       + BorshSerialize
       + BorshDeserialize,
   > Id for I
 {
 }
 
-/// A wrapper for a group element which implements the scale/borsh traits.
+/// A wrapper for a group element which implements the `borsh` traits.
 #[derive(Clone, Copy, PartialEq, Eq, Debug)]
 pub struct EncodableG<G: GroupEncoding>(pub G);
-impl<G: GroupEncoding> Encode for EncodableG<G> {
-  fn using_encoded<R, F: FnOnce(&[u8]) -> R>(&self, f: F) -> R {
-    f(self.0.to_bytes().as_ref())
-  }
-}
 impl<G: GroupEncoding> BorshSerialize for EncodableG<G> {
   fn serialize<W: borsh::io::Write>(&self, writer: &mut W) -> borsh::io::Result<()> {
     writer.write_all(self.0.to_bytes().as_ref())

processor/primitives/src/output.rs

@@ -5,7 +5,7 @@ use group::GroupEncoding;
 
 use borsh::{BorshSerialize, BorshDeserialize};
 
-use serai_primitives::{ExternalAddress, ExternalBalance};
+use serai_primitives::{address::ExternalAddress, balance::ExternalBalance};
 
 use crate::Id;
 

processor/primitives/src/payment.rs

@@ -1,10 +1,11 @@
 use std::io;
 
-use scale::{Encode, Decode, IoReader};
 use borsh::{BorshSerialize, BorshDeserialize};
 
-use serai_primitives::ExternalBalance;
-use serai_coins_primitives::OutInstructionWithBalance;
+use serai_primitives::{
+  balance::ExternalBalance,
+  instructions::{OutInstruction, OutInstructionWithBalance},
+};
 
 use crate::Address;
 
@@ -18,9 +19,11 @@ pub struct Payment<A: Address> {
 impl<A: Address> TryFrom<OutInstructionWithBalance> for Payment<A> {
   type Error = ();
   fn try_from(out_instruction_with_balance: OutInstructionWithBalance) -> Result<Self, ()> {
-    Ok(Payment {
-      address: out_instruction_with_balance.instruction.address.try_into().map_err(|_| ())?,
-      balance: out_instruction_with_balance.balance,
+    Ok(match out_instruction_with_balance.instruction {
+      OutInstruction::Transfer(address) => Payment {
+        address: address.try_into().map_err(|_| ())?,
+        balance: out_instruction_with_balance.balance,
+      },
     })
   }
 }
@@ -43,14 +46,12 @@ impl<A: Address> Payment<A> {
   /// Read a Payment.
   pub fn read(reader: &mut impl io::Read) -> io::Result<Self> {
     let address = A::deserialize_reader(reader)?;
-    let reader = &mut IoReader(reader);
-    let balance = ExternalBalance::decode(reader).map_err(io::Error::other)?;
+    let balance = ExternalBalance::deserialize_reader(reader).map_err(io::Error::other)?;
     Ok(Self { address, balance })
   }
   /// Write the Payment.
   pub fn write(&self, writer: &mut impl io::Write) -> io::Result<()> {
     self.address.serialize(writer)?;
-    self.balance.encode_to(writer);
-    Ok(())
+    self.balance.serialize(writer)
   }
 }

processor/scanner/Cargo.toml

@@ -20,7 +20,6 @@ workspace = true
 [dependencies]
 # Encoders
 hex = { version = "0.4", default-features = false, features = ["std"] }
-scale = { package = "parity-scale-codec", version = "3", default-features = false, features = ["std"] }
 borsh = { version = "1", default-features = false, features = ["std", "derive", "de_strict_order"] }
 
 # Cryptography

processor/scanner/src/batch/db.rs

@@ -3,12 +3,10 @@ use std::io::{Read, Write};
 
 use group::GroupEncoding;
 
-use scale::{Encode, Decode, IoReader};
 use borsh::{BorshSerialize, BorshDeserialize};
 use serai_db::{Get, DbTxn, create_db};
 
-use serai_primitives::ExternalBalance;
-use serai_validator_sets_primitives::Session;
+use serai_primitives::{balance::ExternalBalance, validator_sets::Session};
 
 use primitives::EncodableG;
 use crate::{ScannerFeed, KeyFor, AddressFor};
@@ -94,7 +92,7 @@ impl<S: ScannerFeed> BatchDb<S> {
       if let Some(ReturnInformation { address, balance }) = return_information {
         buf.write_all(&[1]).unwrap();
         address.serialize(&mut buf).unwrap();
-        balance.encode_to(&mut buf);
+        balance.serialize(&mut buf).unwrap();
       } else {
         buf.write_all(&[0]).unwrap();
       }
@@ -116,7 +114,7 @@ impl<S: ScannerFeed> BatchDb<S> {
 
       res.push((opt[0] == 1).then(|| {
         let address = AddressFor::<S>::deserialize_reader(&mut buf).unwrap();
-        let balance = ExternalBalance::decode(&mut IoReader(&mut buf)).unwrap();
+        let balance = ExternalBalance::deserialize_reader(&mut buf).unwrap();
         ReturnInformation { address, balance }
       }));
     }

processor/scanner/src/batch/mod.rs

@@ -2,11 +2,9 @@ use core::{marker::PhantomData, future::Future};
 
 use blake2::{digest::typenum::U32, Digest, Blake2b};
 
-use scale::Encode;
 use serai_db::{DbTxn, Db};
 
-use serai_primitives::BlockHash;
-use serai_in_instructions_primitives::{MAX_BATCH_SIZE, Batch};
+use serai_primitives::{BlockHash, instructions::Batch};
 
 use primitives::{
   EncodableG,
@@ -111,12 +109,7 @@ impl<D: Db, S: ScannerFeed> ContinuallyRan for BatchTask<D, S> {
           let mut batch_id = BatchDb::<S>::acquire_batch_id(&mut txn);
 
           // start with empty batch
-          let mut batches = vec![Batch {
-            network,
-            id: batch_id,
-            external_network_block_hash,
-            instructions: vec![],
-          }];
+          let mut batches = vec![Batch::new(network, batch_id, external_network_block_hash)];
           // We also track the return information for the InInstructions within a Batch in case
           // they error
           let mut return_information = vec![vec![]];
@@ -125,23 +118,19 @@ impl<D: Db, S: ScannerFeed> ContinuallyRan for BatchTask<D, S> {
             let balance = in_instruction.balance;
 
             let batch = batches.last_mut().unwrap();
-            batch.instructions.push(in_instruction);
 
             // check if batch is over-size
-            if batch.encode().len() > MAX_BATCH_SIZE {
-              // pop the last instruction so it's back in size
-              let in_instruction = batch.instructions.pop().unwrap();
-
+            if batch.push_instruction(in_instruction.clone()).is_err() {
               // bump the id for the new batch
               batch_id = BatchDb::<S>::acquire_batch_id(&mut txn);
 
               // make a new batch with this instruction included
-              batches.push(Batch {
-                network,
-                id: batch_id,
-                external_network_block_hash,
-                instructions: vec![in_instruction],
-              });
+              let mut batch = Batch::new(network, batch_id, external_network_block_hash);
+              batch
+                .push_instruction(in_instruction)
+                .expect("single InInstruction exceeded Batch size limit");
+              batches.push(batch);
+
               // Since we're allocating a new batch, allocate a new set of return addresses for it
               return_information.push(vec![]);
             }
@@ -157,16 +146,16 @@ impl<D: Db, S: ScannerFeed> ContinuallyRan for BatchTask<D, S> {
           // Now that we've finalized the Batches, save the information for each to the database
           assert_eq!(batches.len(), return_information.len());
           for (batch, return_information) in batches.iter().zip(&return_information) {
-            assert_eq!(batch.instructions.len(), return_information.len());
+            assert_eq!(batch.instructions().len(), return_information.len());
             BatchDb::<S>::save_batch_info(
               &mut txn,
-              batch.id,
+              batch.id(),
               block_number,
               session_to_sign_batch,
               external_key_for_session_to_sign_batch,
-              Blake2b::<U32>::digest(batch.instructions.encode()).into(),
+              Blake2b::<U32>::digest(borsh::to_vec(&batch.instructions()).unwrap()).into(),
             );
-            BatchDb::<S>::save_return_information(&mut txn, batch.id, return_information);
+            BatchDb::<S>::save_return_information(&mut txn, batch.id(), return_information);
           }
 
           for batch in batches {

processor/scanner/src/db.rs

@@ -3,13 +3,13 @@ use std::io::{self, Read, Write};
 
 use group::GroupEncoding;
 
-use scale::{Encode, Decode, IoReader};
 use borsh::{BorshSerialize, BorshDeserialize};
 use serai_db::{Get, DbTxn, create_db, db_channel};
 
-use serai_coins_primitives::OutInstructionWithBalance;
-use serai_validator_sets_primitives::Session;
-use serai_in_instructions_primitives::{InInstructionWithBalance, Batch};
+use serai_primitives::{
+  validator_sets::Session,
+  instructions::{InInstructionWithBalance, Batch, OutInstructionWithBalance},
+};
 
 use primitives::{EncodableG, ReceivedOutput};
 
@@ -56,7 +56,7 @@ impl<S: ScannerFeed> OutputWithInInstruction<S> {
       (opt[0] == 1).then(|| AddressFor::<S>::deserialize_reader(reader)).transpose()?
     };
     let in_instruction =
-      InInstructionWithBalance::decode(&mut IoReader(reader)).map_err(io::Error::other)?;
+      InInstructionWithBalance::deserialize_reader(reader).map_err(io::Error::other)?;
     Ok(Self { output, return_address, in_instruction })
   }
   pub(crate) fn write(&self, writer: &mut impl io::Write) -> io::Result<()> {
@@ -67,7 +67,7 @@ impl<S: ScannerFeed> OutputWithInInstruction<S> {
     } else {
       writer.write_all(&[0])?;
     }
-    self.in_instruction.encode_to(writer);
+    self.in_instruction.serialize(writer)?;
     Ok(())
   }
 }
@@ -76,10 +76,10 @@ create_db!(
   ScannerGlobal {
     StartBlock: () -> u64,
 
-    QueuedKey: <K: Encode>(key: K) -> (),
+    QueuedKey: <K: BorshSerialize>(key: K) -> (),
 
     ActiveKeys: <K: Borshy>() -> Vec<SeraiKeyDbEntry<K>>,
-    RetireAt: <K: Encode>(key: K) -> u64,
+    RetireAt: <K: BorshSerialize>(key: K) -> u64,
 
     // Highest acknowledged block
     HighestAcknowledgedBlock: () -> u64,
@@ -294,7 +294,7 @@ impl<S: ScannerFeed> ScannerGlobalDb<S> {
     assert!((opt[0] == 0) || (opt[0] == 1));
 
     let address = (opt[0] == 1).then(|| AddressFor::<S>::deserialize_reader(&mut buf).unwrap());
-    Some((address, InInstructionWithBalance::decode(&mut IoReader(buf)).unwrap()))
+    Some((address, InInstructionWithBalance::deserialize_reader(&mut buf).unwrap()))
   }
 }
 
@@ -357,7 +357,7 @@ impl<S: ScannerFeed> ScanToEventualityDb<S> {
       } else {
         buf.write_all(&[0]).unwrap();
       }
-      forward.in_instruction.encode_to(&mut buf);
+      forward.in_instruction.serialize(&mut buf).unwrap();
 
       SerializedForwardedOutput::set(txn, forward.output.id().as_ref(), &buf);
     }
@@ -454,7 +454,7 @@ impl<S: ScannerFeed> Returnable<S> {
       (opt[0] == 1).then(|| AddressFor::<S>::deserialize_reader(reader)).transpose()?;
 
     let in_instruction =
-      InInstructionWithBalance::decode(&mut IoReader(reader)).map_err(io::Error::other)?;
+      InInstructionWithBalance::deserialize_reader(reader).map_err(io::Error::other)?;
     Ok(Returnable { return_address, in_instruction })
   }
   fn write(&self, writer: &mut impl io::Write) -> io::Result<()> {
@@ -464,7 +464,7 @@ impl<S: ScannerFeed> Returnable<S> {
     } else {
       writer.write_all(&[0])?;
     }
-    self.in_instruction.encode_to(writer);
+    self.in_instruction.serialize(writer)?;
     Ok(())
   }
 }
@@ -494,7 +494,7 @@ impl<S: ScannerFeed> ScanToBatchDb<S> {
     block_number: u64,
     data: &InInstructionData<S>,
   ) {
-    let mut buf = data.session_to_sign_batch.encode();
+    let mut buf = borsh::to_vec(&data.session_to_sign_batch).unwrap();
     buf.extend(data.external_key_for_session_to_sign_batch.to_bytes().as_ref());
     for returnable_in_instruction in &data.returnable_in_instructions {
       returnable_in_instruction.write(&mut buf).unwrap();
@@ -517,7 +517,7 @@ impl<S: ScannerFeed> ScanToBatchDb<S> {
     );
     let mut buf = data.returnable_in_instructions.as_slice();
 
-    let session_to_sign_batch = Session::decode(&mut buf).unwrap();
+    let session_to_sign_batch = Session::deserialize_reader(&mut buf).unwrap();
     let external_key_for_session_to_sign_batch = {
       let mut external_key_for_session_to_sign_batch =
         <KeyFor<S> as GroupEncoding>::Repr::default();
@@ -595,7 +595,7 @@ impl SubstrateToEventualityDb {
 }
 
 mod _public_db {
-  use serai_in_instructions_primitives::Batch;
+  use serai_primitives::instructions::Batch;
 
   use serai_db::{Get, DbTxn, create_db, db_channel};
 

processor/scanner/src/eventuality/db.rs

@@ -1,6 +1,7 @@
 use core::marker::PhantomData;
 
-use scale::Encode;
+use borsh::BorshSerialize;
+
 use serai_db::{Get, DbTxn, create_db};
 
 use primitives::{EncodableG, ReceivedOutput, Eventuality, EventualityTracker};
@@ -14,7 +15,7 @@ create_db!(
     // The latest block this task has handled which was notable
     LatestHandledNotableBlock: () -> u64,
 
-    SerializedEventualities: <K: Encode>(key: K) -> Vec<u8>,
+    SerializedEventualities: <K: BorshSerialize>(key: K) -> Vec<u8>,
 
     AccumulatedOutput: (id: &[u8]) -> (),
   }

processor/scanner/src/lib.rs

@@ -10,8 +10,10 @@ use group::GroupEncoding;
 use borsh::{BorshSerialize, BorshDeserialize};
 use serai_db::{Get, DbTxn, Db};
 
-use serai_primitives::{ExternalNetworkId, ExternalCoin, Amount};
-use serai_coins_primitives::OutInstructionWithBalance;
+use serai_primitives::{
+  network_id::ExternalNetworkId, coin::ExternalCoin, balance::Amount,
+  instructions::OutInstructionWithBalance,
+};
 
 use messages::substrate::ExecutedBatch;
 use primitives::{task::*, Address, ReceivedOutput, Block, Payment};

processor/scanner/src/report/db.rs

@@ -1,6 +1,6 @@
 use serai_db::{Get, DbTxn, create_db};
 
-use serai_validator_sets_primitives::Session;
+use serai_primitives::validator_sets::Session;
 
 create_db!(
   ScannerBatch {

processor/scanner/src/report/mod.rs

@@ -2,7 +2,7 @@ use core::{marker::PhantomData, future::Future};
 
 use serai_db::{DbTxn, Db};
 
-use serai_validator_sets_primitives::Session;
+use serai_primitives::validator_sets::Session;
 
 use primitives::task::{DoesNotError, ContinuallyRan};
 use crate::{
@@ -70,12 +70,12 @@ impl<D: Db, S: ScannerFeed> ContinuallyRan for ReportTask<D, S> {
           // Because this boolean was expanded, we lose short-circuiting. That's fine
           let handover_batch = last_session != session_to_sign_batch;
           let batch_after_handover_batch =
-            (last_session == session_to_sign_batch) && ((first_batch + 1) == batch.id);
+            (last_session == session_to_sign_batch) && ((first_batch + 1) == batch.id());
           if handover_batch || batch_after_handover_batch {
             let verified_prior_batch = substrate::last_acknowledged_batch::<S>(&txn)
-              // Since `batch.id = 0` in the Session(0)-never-published-a-Batch case, we don't
-              // check `last_acknowledged_batch >= (batch.id - 1)` but instead this
-              .map(|last_acknowledged_batch| (last_acknowledged_batch + 1) >= batch.id)
+              // Since `batch.id() = 0` in the Session(0)-never-published-a-Batch case, we don't
+              // check `last_acknowledged_batch >= (batch.id() - 1)` but instead this
+              .map(|last_acknowledged_batch| (last_acknowledged_batch + 1) >= batch.id())
               // We've never verified any Batches
               .unwrap_or(false);
             if !verified_prior_batch {
@@ -90,7 +90,7 @@ impl<D: Db, S: ScannerFeed> ContinuallyRan for ReportTask<D, S> {
             BatchDb::set_last_session_to_sign_batch_and_first_batch(
               &mut txn,
               session_to_sign_batch,
-              batch.id,
+              batch.id(),
             );
           }
         }

processor/scanner/src/scan/mod.rs

@@ -1,12 +1,12 @@
 use core::future::Future;
 use std::collections::HashMap;
 
-use scale::Decode;
+use borsh::BorshDeserialize;
+
 use serai_db::{Get, DbTxn, Db};
 
-use serai_in_instructions_primitives::{
-  Shorthand, RefundableInInstruction, InInstruction, InInstructionWithBalance,
-};
+#[rustfmt::skip]
+use serai_primitives::instructions::{RefundableInInstruction, InInstruction, InInstructionWithBalance};
 
 use primitives::{task::ContinuallyRan, OutputType, ReceivedOutput, Block};
 
@@ -55,26 +55,22 @@ fn in_instruction_from_output<S: ScannerFeed>(
   let presumed_origin = output.presumed_origin();
 
   let mut data = output.data();
-  let shorthand = match Shorthand::decode(&mut data) {
-    Ok(shorthand) => shorthand,
-    Err(e) => {
-      log::info!("data in output {} wasn't valid shorthand: {e:?}", hex::encode(output.id()));
-      return (presumed_origin, None);
-    }
-  };
-  let instruction = match RefundableInInstruction::try_from(shorthand) {
+  let instruction = match RefundableInInstruction::deserialize_reader(&mut data) {
     Ok(instruction) => instruction,
     Err(e) => {
       log::info!(
-        "shorthand in output {} wasn't convertible to a RefundableInInstruction: {e:?}",
-        hex::encode(output.id())
+        "data in output {} wasn't a valid `RefundableInInstruction`: {e:?}",
+        hex::encode(output.id()),
       );
       return (presumed_origin, None);
     }
   };
 
   (
-    instruction.origin.and_then(|addr| AddressFor::<S>::try_from(addr).ok()).or(presumed_origin),
+    instruction
+      .return_address
+      .and_then(|addr| AddressFor::<S>::try_from(addr).ok())
+      .or(presumed_origin),
     Some(instruction.instruction),
   )
 }

processor/scanner/src/substrate/db.rs

@@ -5,7 +5,7 @@ use group::GroupEncoding;
 use borsh::{BorshSerialize, BorshDeserialize};
 use serai_db::{Get, DbTxn, create_db, db_channel};
 
-use serai_coins_primitives::OutInstructionWithBalance;
+use serai_primitives::instructions::OutInstructionWithBalance;
 
 use messages::substrate::ExecutedBatch;
 

processor/scanner/src/substrate/mod.rs

@@ -2,7 +2,7 @@ use core::{marker::PhantomData, future::Future};
 
 use serai_db::{Get, DbTxn, Db};
 
-use serai_coins_primitives::{OutInstruction, OutInstructionWithBalance};
+use serai_primitives::instructions::{OutInstruction, OutInstructionWithBalance};
 
 use messages::substrate::ExecutedBatch;
 use primitives::task::{DoesNotError, ContinuallyRan};
@@ -150,7 +150,7 @@ impl<D: Db, S: ScannerFeed> ContinuallyRan for SubstrateTask<D, S> {
 
                 if let Some(batch::ReturnInformation { address, balance }) = return_information {
                   burns.push(OutInstructionWithBalance {
-                    instruction: OutInstruction { address: address.into() },
+                    instruction: OutInstruction::Transfer(address.into()),
                     balance,
                   });
                 }

processor/scheduler/primitives/Cargo.toml

@@ -15,7 +15,7 @@ all-features = true
 rustdoc-args = ["--cfg", "docsrs"]
 
 [package.metadata.cargo-machete]
-ignored = ["scale", "borsh"]
+ignored = ["borsh"]
 
 [lints]
 workspace = true
@@ -24,7 +24,6 @@ workspace = true
 ciphersuite = { path = "../../../crypto/ciphersuite", default-features = false, features = ["std"] }
 frost = { package = "modular-frost", path = "../../../crypto/frost", 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-db = { path = "../../../common/db" }

processor/scheduler/smart-contract/Cargo.toml

@@ -15,7 +15,7 @@ all-features = true
 rustdoc-args = ["--cfg", "docsrs"]
 
 [package.metadata.cargo-machete]
-ignored = ["scale", "borsh"]
+ignored = ["borsh"]
 
 [lints]
 workspace = true
@@ -23,7 +23,6 @@ workspace = true
 [dependencies]
 group = { version = "0.13", 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-db = { path = "../../../common/db" }

processor/scheduler/utxo/primitives/src/lib.rs

@@ -4,7 +4,7 @@
 
 use core::{fmt::Debug, future::Future};
 
-use serai_primitives::Amount;
+use serai_primitives::balance::Amount;
 
 use primitives::{ReceivedOutput, Payment};
 use scanner::{ScannerFeed, KeyFor, AddressFor, OutputFor, EventualityFor, BlockFor};

processor/scheduler/utxo/primitives/src/tree.rs

@@ -1,6 +1,9 @@
 use borsh::{BorshSerialize, BorshDeserialize};
 
-use serai_primitives::{ExternalCoin, Amount, ExternalBalance};
+use serai_primitives::{
+  coin::ExternalCoin,
+  balance::{Amount, ExternalBalance},
+};
 
 use primitives::{Address, Payment};
 use scanner::ScannerFeed;

processor/scheduler/utxo/standard/Cargo.toml

@@ -15,7 +15,7 @@ all-features = true
 rustdoc-args = ["--cfg", "docsrs"]
 
 [package.metadata.cargo-machete]
-ignored = ["scale", "borsh"]
+ignored = ["borsh"]
 
 [lints]
 workspace = true
@@ -23,7 +23,6 @@ workspace = true
 [dependencies]
 group = { version = "0.13", 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-primitives = { path = "../../../../substrate/primitives", default-features = false, features = ["std"] }

processor/scheduler/utxo/standard/src/db.rs

@@ -2,7 +2,10 @@ use core::marker::PhantomData;
 
 use group::GroupEncoding;
 
-use serai_primitives::{ExternalCoin, Amount, ExternalBalance};
+use serai_primitives::{
+  coin::ExternalCoin,
+  balance::{Amount, ExternalBalance},
+};
 
 use borsh::BorshDeserialize;
 use serai_db::{Get, DbTxn, create_db, db_channel};

processor/scheduler/utxo/standard/src/lib.rs

@@ -7,7 +7,10 @@ use std::collections::HashMap;
 
 use group::GroupEncoding;
 
-use serai_primitives::{ExternalCoin, Amount, ExternalBalance};
+use serai_primitives::{
+  coin::ExternalCoin,
+  balance::{Amount, ExternalBalance},
+};
 
 use serai_db::DbTxn;
 

processor/scheduler/utxo/transaction-chaining/Cargo.toml

@@ -15,7 +15,7 @@ all-features = true
 rustdoc-args = ["--cfg", "docsrs"]
 
 [package.metadata.cargo-machete]
-ignored = ["scale", "borsh"]
+ignored = ["borsh"]
 
 [lints]
 workspace = true
@@ -23,7 +23,6 @@ workspace = true
 [dependencies]
 group = { version = "0.13", 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-primitives = { path = "../../../../substrate/primitives", default-features = false, features = ["std"] }

processor/scheduler/utxo/transaction-chaining/src/db.rs

@@ -2,7 +2,7 @@ use core::marker::PhantomData;
 
 use group::GroupEncoding;
 
-use serai_primitives::{ExternalCoin, Amount};
+use serai_primitives::{coin::ExternalCoin, balance::Amount};
 
 use serai_db::{Get, DbTxn, create_db};
 

processor/scheduler/utxo/transaction-chaining/src/lib.rs

@@ -7,7 +7,7 @@ use std::collections::HashMap;
 
 use group::GroupEncoding;
 
-use serai_primitives::{ExternalCoin, Amount};
+use serai_primitives::{coin::ExternalCoin, balance::Amount};
 
 use serai_db::DbTxn;
 

processor/signers/Cargo.toml

@@ -30,7 +30,6 @@ dalek-ff-group = { path = "../../crypto/dalek-ff-group", default-features = fals
 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-primitives = { path = "../../substrate/primitives", default-features = false, features = ["std"] }
@@ -39,7 +38,7 @@ serai-db = { path = "../../common/db" }
 log = { version = "0.4", default-features = false, features = ["std"] }
 tokio = { version = "1", default-features = false, features = ["rt-multi-thread", "sync", "time", "macros"] }
 
-serai-cosign = { path = "../../coordinator/cosign" }
+serai-cosign = { package = "serai-cosign-types", path = "../../coordinator/cosign/types" }
 messages = { package = "serai-processor-messages", path = "../messages" }
 primitives = { package = "serai-processor-primitives", path = "../primitives" }
 scanner = { package = "serai-processor-scanner", path = "../scanner" }

processor/signers/src/batch/db.rs

@@ -1,5 +1,7 @@
-use serai_validator_sets_primitives::Session;
-use serai_in_instructions_primitives::{Batch, SignedBatch};
+use serai_primitives::{
+  validator_sets::Session,
+  instructions::{Batch, SignedBatch},
+};
 
 use serai_db::{Get, DbTxn, create_db};
 

processor/signers/src/batch/mod.rs

@@ -6,10 +6,7 @@ use ciphersuite::group::GroupEncoding;
 use dalek_ff_group::Ristretto;
 use frost::dkg::ThresholdKeys;
 
-use scale::Encode;
-
-use serai_validator_sets_primitives::Session;
-use serai_in_instructions_primitives::{SignedBatch, batch_message};
+use serai_primitives::{validator_sets::Session, instructions::SignedBatch};
 
 use serai_db::{Get, DbTxn, Db};
 
@@ -74,7 +71,7 @@ impl<D: Db, E: GroupEncoding> BatchSignerTask<D, E> {
         machines.push(WrappedSchnorrkelMachine::new(
           keys.clone(),
           b"substrate",
-          batch_message(&batch),
+          batch.publish_batch_message(),
         ));
       }
       attempt_manager.register(VariantSignId::Batch(id), machines);
@@ -100,14 +97,14 @@ impl<D: Db, E: Send + GroupEncoding> ContinuallyRan for BatchSignerTask<D, E> {
         iterated = true;
 
         // Save this to the database as a transaction to sign
-        let batch_hash = <[u8; 32]>::from(Blake2b::<U32>::digest(batch.encode()));
+        let batch_hash = <[u8; 32]>::from(Blake2b::<U32>::digest(borsh::to_vec(&batch).unwrap()));
         self.active_signing_protocols.insert(batch_hash);
         ActiveSigningProtocols::set(
           &mut txn,
           self.session,
           &self.active_signing_protocols.iter().copied().collect(),
         );
-        BatchHash::set(&mut txn, batch.id, &batch_hash);
+        BatchHash::set(&mut txn, batch.id(), &batch_hash);
         Batches::set(&mut txn, batch_hash, &batch);
 
         let mut machines = Vec::with_capacity(self.keys.len());
@@ -116,7 +113,7 @@ impl<D: Db, E: Send + GroupEncoding> ContinuallyRan for BatchSignerTask<D, E> {
           machines.push(WrappedSchnorrkelMachine::new(
             keys.clone(),
             b"substrate",
-            batch_message(&batch),
+            batch.publish_batch_message(),
           ));
         }
         for msg in self.attempt_manager.register(VariantSignId::Batch(batch_hash), machines) {
@@ -160,8 +157,8 @@ impl<D: Db, E: Send + GroupEncoding> ContinuallyRan for BatchSignerTask<D, E> {
         // Update the last acknowledged Batch
         {
           let last_acknowledged = LastAcknowledgedBatch::get(&txn);
-          if Some(batch.id) > last_acknowledged {
-            LastAcknowledgedBatch::set(&mut txn, &batch.id);
+          if Some(batch.id()) > last_acknowledged {
+            LastAcknowledgedBatch::set(&mut txn, &batch.id());
           }
         }
 
@@ -174,7 +171,7 @@ impl<D: Db, E: Send + GroupEncoding> ContinuallyRan for BatchSignerTask<D, E> {
         );
 
         // Clean up SignedBatches
-        SignedBatches::del(&mut txn, batch.id);
+        SignedBatches::del(&mut txn, batch.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
@@ -203,7 +200,7 @@ impl<D: Db, E: Send + GroupEncoding> ContinuallyRan for BatchSignerTask<D, E> {
             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);
+            SignedBatches::set(&mut txn, signed_batch.batch.id(), &signed_batch);
           }
         }
 

processor/signers/src/coordinator/mod.rs

@@ -1,6 +1,6 @@
 use core::future::Future;
 
-use serai_primitives::Signature;
+use serai_primitives::crypto::Signature;
 
 use serai_db::{DbTxn, Db};
 
@@ -140,7 +140,7 @@ impl<D: Db, C: Coordinator> ContinuallyRan for CoordinatorTask<D, C> {
         let mut next_batch = last_batch.map(|id| id + 1).unwrap_or(0);
         while let Some(batch) = crate::batch::signed_batch(&txn, next_batch) {
           iterated = true;
-          db::LastPublishedBatch::set(&mut txn, &batch.batch.id);
+          db::LastPublishedBatch::set(&mut txn, &batch.batch.id());
           self
             .coordinator
             .publish_signed_batch(batch)

processor/signers/src/cosign/db.rs

@@ -1,4 +1,4 @@
-use serai_validator_sets_primitives::Session;
+use serai_primitives::validator_sets::Session;
 
 use serai_db::{Get, DbTxn, create_db};
 

processor/signers/src/cosign/mod.rs

@@ -3,9 +3,7 @@ use core::future::Future;
 use dalek_ff_group::Ristretto;
 use frost::dkg::ThresholdKeys;
 
-use scale::Encode;
-use serai_primitives::Signature;
-use serai_validator_sets_primitives::Session;
+use serai_primitives::{crypto::Signature, validator_sets::Session};
 
 use serai_db::{DbTxn, Db};
 
@@ -127,7 +125,7 @@ impl<D: Db> ContinuallyRan for CosignerTask<D> {
             LatestCosigned::set(&mut txn, self.session, &cosign.block_number);
             let cosign = SignedCosign {
               cosign,
-              signature: Signature::from(signature).encode().try_into().unwrap(),
+              signature: borsh::to_vec(&Signature::from(signature)).unwrap().try_into().unwrap(),
             };
             // Send the cosign
             Cosign::send(&mut txn, self.session, &cosign);

processor/signers/src/db.rs

@@ -1,4 +1,4 @@
-use serai_validator_sets_primitives::{Session, SlashReport as SlashReportStruct};
+use serai_primitives::validator_sets::{Session, SlashReport as SlashReportStruct};
 
 use serai_db::{Get, DbTxn, create_db, db_channel};
 

processor/signers/src/lib.rs

@@ -11,9 +11,11 @@ use ciphersuite::{group::GroupEncoding, Ciphersuite};
 use dalek_ff_group::Ristretto;
 use frost::dkg::ThresholdKeys;
 
-use serai_primitives::Signature;
-use serai_validator_sets_primitives::{Session, SlashReport};
-use serai_in_instructions_primitives::SignedBatch;
+use serai_primitives::{
+  crypto::Signature,
+  validator_sets::{Session, SlashReport},
+  instructions::SignedBatch,
+};
 
 use serai_db::{DbTxn, Db};
 

processor/signers/src/slash_report.rs

@@ -3,8 +3,7 @@ use core::{marker::PhantomData, future::Future};
 use dalek_ff_group::Ristretto;
 use frost::dkg::ThresholdKeys;
 
-use serai_primitives::Signature;
-use serai_validator_sets_primitives::Session;
+use serai_primitives::{crypto::Signature, validator_sets::Session};
 
 use serai_db::{DbTxn, Db};
 

processor/signers/src/transaction/db.rs

@@ -1,4 +1,4 @@
-use serai_validator_sets_primitives::Session;
+use serai_primitives::validator_sets::Session;
 
 use serai_db::{Get, DbTxn, create_db};
 

processor/signers/src/transaction/mod.rs

@@ -6,7 +6,7 @@ use std::{
 
 use frost::dkg::ThresholdKeys;
 
-use serai_validator_sets_primitives::Session;
+use serai_primitives::validator_sets::Session;
 
 use serai_db::{DbTxn, Db};
 

substrate/abi/Cargo.toml

@@ -22,13 +22,13 @@ workspace = true
 borsh = { version = "1", default-features = false, features = ["derive", "de_strict_order"] }
 
 bitvec = { version = "1", default-features = false, features = ["alloc"] }
-sp-core = { git = "https://github.com/serai-dex/polkadot-sdk", branch = "serai-next", default-features = false }
+sp-core = { git = "https://github.com/serai-dex/patch-polkadot-sdk", rev = "2bfdaed4b3614de2fe7d10e4ece3e6a912833e90", default-features = false }
 
 serde = { version = "1", default-features = false, features = ["derive"], optional = true }
 scale = { package = "parity-scale-codec", version = "3", default-features = false, features = ["derive"], optional = true }
 scale-info = { version = "2", default-features = false, features = ["derive"], optional = true }
-sp-runtime = { git = "https://github.com/serai-dex/polkadot-sdk", branch = "serai-next", default-features = false, features = ["serde"], optional = true }
-frame-support = { git = "https://github.com/serai-dex/polkadot-sdk", branch = "serai-next", default-features = false, optional = true }
+sp-runtime = { git = "https://github.com/serai-dex/patch-polkadot-sdk", rev = "2bfdaed4b3614de2fe7d10e4ece3e6a912833e90", default-features = false, features = ["serde"], optional = true }
+frame-support = { git = "https://github.com/serai-dex/patch-polkadot-sdk", rev = "2bfdaed4b3614de2fe7d10e4ece3e6a912833e90", default-features = false, optional = true }
 
 serai-primitives = { path = "../primitives", version = "0.1", default-features = false }
 
@@ -47,6 +47,6 @@ std = [
 
   "serai-primitives/std",
 ]
-substrate = ["serde", "scale", "scale-info", "sp-runtime", "frame-support", "serai-primitives/non_canonical_scale_derivations"]
+substrate = ["serde", "scale", "scale-info", "sp-runtime", "frame-support", "serai-primitives/serde", "serai-primitives/non_canonical_scale_derivations"]
 try-runtime = ["sp-runtime/try-runtime"]
 default = ["std"]

substrate/abi/src/block.rs

@@ -105,7 +105,7 @@ pub struct Block {
 mod substrate {
   use core::fmt::Debug;
 
-  use scale::{Encode, Decode};
+  use scale::{Encode, Decode, DecodeWithMemTracking};
   use scale_info::TypeInfo;
 
   use sp_core::H256;
@@ -116,6 +116,31 @@ mod substrate {
 
   use super::*;
 
+  // Add `serde` implementations which treat self as a `Vec<u8>`
+  impl sp_core::serde::Serialize for Transaction {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+      S: sp_core::serde::Serializer,
+    {
+      <Vec<u8> as sp_core::serde::Serialize>::serialize(&self.encode(), serializer)
+    }
+  }
+  impl<'de> sp_core::serde::Deserialize<'de> for Transaction {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+      D: sp_core::serde::Deserializer<'de>,
+    {
+      use sp_core::serde::de::Error;
+      let bytes = <Vec<u8> as sp_core::serde::Deserialize>::deserialize(deserializer)?;
+      let mut reader = bytes.as_slice();
+      let block = Self::decode(&mut reader).map_err(D::Error::custom)?;
+      if !reader.is_empty() {
+        Err(D::Error::custom("extraneous bytes at end"))?;
+      }
+      Ok(block)
+    }
+  }
+
   /// The digest for all of the Serai-specific header fields added before execution of the block.
   #[derive(Clone, Copy, PartialEq, Eq, BorshSerialize, BorshDeserialize)]
   pub struct SeraiPreExecutionDigest {
@@ -149,7 +174,18 @@ mod substrate {
   ///
   /// This is not considered part of the protocol proper and may be pruned in the future. It's
   /// solely considered used for consensus now.
-  #[derive(Clone, PartialEq, Eq, Debug, Encode, Decode, TypeInfo, sp_runtime::Serialize)]
+  #[derive(
+    Clone,
+    PartialEq,
+    Eq,
+    Debug,
+    Encode,
+    Decode,
+    DecodeWithMemTracking,
+    TypeInfo,
+    sp_runtime::Serialize,
+    sp_runtime::Deserialize,
+  )]
   pub struct ConsensusV1 {
     /// The hash of the immediately preceding block.
     parent_hash: H256,
@@ -164,14 +200,37 @@ mod substrate {
   }
 
   /// A V1 header for a block, as needed by Substrate.
-  #[derive(Clone, PartialEq, Eq, Debug, Encode, Decode, TypeInfo, sp_runtime::Serialize)]
+  #[derive(
+    Clone,
+    PartialEq,
+    Eq,
+    Debug,
+    Encode,
+    Decode,
+    DecodeWithMemTracking,
+    TypeInfo,
+    sp_runtime::Serialize,
+    sp_runtime::Deserialize,
+  )]
   pub struct SubstrateHeaderV1 {
     number: u64,
     consensus: ConsensusV1,
   }
 
   /// A header for a block, as needed by Substrate.
-  #[derive(Clone, PartialEq, Eq, Debug, Encode, Decode, TypeInfo, sp_runtime::Serialize)]
+  #[derive(
+    Clone,
+    PartialEq,
+    Eq,
+    Debug,
+    Encode,
+    Decode,
+    DecodeWithMemTracking,
+    TypeInfo,
+    sp_runtime::Serialize,
+    sp_runtime::Deserialize,
+  )]
+  #[allow(clippy::cast_possible_truncation)]
   pub enum SubstrateHeader {
     /// A version 1 header.
     V1(SubstrateHeaderV1),
@@ -226,12 +285,34 @@ mod substrate {
   }
 
   /// A block, as needed by Substrate.
-  #[derive(Clone, Debug, PartialEq, Eq, Encode, Decode, sp_runtime::Serialize)]
+  #[derive(Clone, Debug, PartialEq, Eq, Encode, Decode, DecodeWithMemTracking, TypeInfo)]
   pub struct SubstrateBlock {
     header: SubstrateHeader,
-    #[serde(skip)] // This makes this unsafe to deserialize, but we don't impl `Deserialize`
     transactions: Vec<Transaction>,
   }
+  impl sp_core::serde::Serialize for SubstrateBlock {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+      S: sp_core::serde::Serializer,
+    {
+      <Vec<u8> as sp_core::serde::Serialize>::serialize(&self.encode(), serializer)
+    }
+  }
+  impl<'de> sp_core::serde::Deserialize<'de> for SubstrateBlock {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+      D: sp_core::serde::Deserializer<'de>,
+    {
+      use sp_core::serde::de::Error;
+      let bytes = <Vec<u8> as sp_core::serde::Deserialize>::deserialize(deserializer)?;
+      let mut reader = bytes.as_slice();
+      let block = Self::decode(&mut reader).map_err(D::Error::custom)?;
+      if !reader.is_empty() {
+        Err(D::Error::custom("extraneous bytes at end"))?;
+      }
+      Ok(block)
+    }
+  }
 
   impl HeaderTrait for SubstrateHeader {
     type Number = u64;

substrate/abi/src/transaction.rs

@@ -166,17 +166,20 @@ impl BorshDeserialize for Transaction {
     if len == 0 {
       let call = Call::deserialize_reader(reader)?;
       if call.is_signed() {
+        #[allow(clippy::io_other_error)]
         Err(io::Error::new(io::ErrorKind::Other, "call was signed but marked unsigned"))?;
       }
       Ok(Transaction::Unsigned { call: UnsignedCall(call) })
     } else {
       if u32::from(len) > MAX_CALLS {
+        #[allow(clippy::io_other_error)]
         Err(io::Error::new(io::ErrorKind::Other, "too many calls"))?;
       }
       let mut calls = BoundedVec::with_bounded_capacity(len.into());
       for _ in 0 .. len {
         let call = Call::deserialize_reader(reader)?;
         if !call.is_signed() {
+          #[allow(clippy::io_other_error)]
           Err(io::Error::new(io::ErrorKind::Other, "call was unsigned but included as signed"))?;
         }
         calls.try_push(call).unwrap();
@@ -254,12 +257,20 @@ mod substrate {
         fn read(&mut self, buf: &mut [u8]) -> borsh::io::Result<usize> {
           let remaining_len = self.0.remaining_len().map_err(|err| {
             self.1 = Some(err);
+            #[allow(clippy::io_other_error)]
             borsh::io::Error::new(borsh::io::ErrorKind::Other, "")
           })?;
           // If we're still calling `read`, we try to read at least one more byte
           let to_read = buf.len().min(remaining_len.unwrap_or(1));
+          // This may not be _allocated_ making this over-zealous, but it's the best we can do
+          self.0.on_before_alloc_mem(to_read).map_err(|err| {
+            self.1 = Some(err);
+            #[allow(clippy::io_other_error)]
+            borsh::io::Error::new(borsh::io::ErrorKind::Other, "")
+          })?;
           self.0.read(&mut buf[.. to_read]).map_err(|err| {
             self.1 = Some(err);
+            #[allow(clippy::io_other_error)]
             borsh::io::Error::new(borsh::io::ErrorKind::Other, "")
           })?;
           Ok(to_read)
@@ -273,6 +284,23 @@ mod substrate {
     }
   }
 
+  // Clean `Transaction` tracks its memory during decoding, as we do call
+  // `Input::on_before_alloc_mem`
+  impl scale::DecodeWithMemTracking for Transaction {}
+
+  // Shim `TypeInfo` for `Transaction`
+  impl scale_info::TypeInfo for Transaction {
+    type Identity = Self;
+    fn type_info() -> scale_info::Type {
+      scale_info::Type {
+        path: scale_info::Path { segments: vec!["serai_abi", "transaction", "Transaction"] },
+        type_params: vec![],
+        type_def: (scale_info::TypeDefComposite { fields: vec![] }).into(),
+        docs: vec![],
+      }
+    }
+  }
+
   /// The context which transactions are executed in.
   pub trait TransactionContext: 'static + Send + Sync + Clone + PartialEq + Eq + Debug {
     /// The base weight for a signed transaction.