diff --git a/protobufs/stacks/signer/v1/requests.proto b/protobufs/stacks/signer/v1/requests.proto
index b223d3ce..8dbe553e 100644
--- a/protobufs/stacks/signer/v1/requests.proto
+++ b/protobufs/stacks/signer/v1/requests.proto
@@ -18,19 +18,29 @@ message BitcoinTransactionSignRequest {
 message StacksTransactionSignRequest {
   // The aggregate public key that will sign the transaction.
   crypto.PublicKey aggregate_key = 1;
-  // The contract call transaction to sign.
-  // pub contract_call: ContractCall,
   // The nonce to use for the transaction.
-  uint64 nonce = 3;
+  uint64 nonce = 2;
   // The transaction fee in microSTX.
-  uint64 tx_fee = 4;
-  // The expected digest of the transaction than needs to be signed.
-  // It's essentially a hash of the contract call struct, the nonce, the
-  // tx_fee and a few other things.
-  crypto.Uint256 digest = 5;
+  uint64 tx_fee = 3;
+  // The expected digest of the transaction than needs to be signed. It's
+  // essentially a hash of the contract call struct, the nonce, the tx_fee
+  // and a few other things.
+  crypto.Uint256 digest = 4;
+  // The contract call transaction to sign.
+  oneof contract_call {
+    // The `complete-deposit` contract call
+    CompleteDeposit complete_deposit = 5;
+    // The `accept-withdrawal-request` contract call
+    AcceptWithdrawal accept_withdrawal = 6;
+    // The `reject-withdrawal-request` contract call
+    RejectWithdrawal reject_withdrawal = 7;
+    // The `rotate-keys-wrapper` contract call
+    RotateKeys rotate_keys = 8;
+  }
 }
 
-// A complete-deposit contract call on Stacks.
+// For making a `complete-deposit` contract call in the sbtc-deposit
+// smart contract.
 message CompleteDeposit {
   // The outpoint of the bitcoin UTXO that was spent as a deposit for
   // sBTC.
@@ -54,7 +64,8 @@ message CompleteDeposit {
   uint64 sweep_block_height = 7;
 }
 
-// The `accept-withdrawal-request` contract call on the stacks blockchain.
+// For making a `accept-withdrawal-request` contract call in the
+// sbtc-withdrawal smart contract.
 message AcceptWithdrawal {
   // The ID of the withdrawal request generated by the
   // `initiate-withdrawal-request` function in the sbtc-withdrawal smart
@@ -66,9 +77,9 @@ message AcceptWithdrawal {
   // The fee that was spent to the bitcoin miner when fulfilling the
   // withdrawal request.
   uint64 tx_fee = 3;
-  // A bitmap of how the signers voted. This structure supports up to
-  // 128 distinct signers. Here, we assume that a 1 (or true) implies
-  // that the signer voted *against* the transaction.
+  // A bitmap of how the signers voted. The length of the list must be less
+  // than or equal to 128. Here, we assume that a true implies that the
+  // associated signer voted *against* the withdrawal.
   repeated bool signer_bitmap = 4;
   // The address that deployed the contract.
   stacks.StacksAddress deployer = 5;
@@ -78,3 +89,32 @@ message AcceptWithdrawal {
   // The block height associated with the above bitcoin block hash.
   uint64 sweep_block_height = 7;
 }
+
+// For making a `reject-withdrawal-request` contract call in the
+// sbtc-withdrawal smart contract.
+message RejectWithdrawal {
+  // The ID of the withdrawal request generated by the
+  // `initiate-withdrawal-request` function in the sbtc-withdrawal smart
+  // contract.
+  uint64 request_id = 1;
+  // A bitmap of how the signers voted. The length of the list must be less
+  // than or equal to 128. Here, we assume that a true implies that the
+  // associated signer voted *against* the withdrawal.
+  repeated bool signer_bitmap = 2;
+  // The address that deployed the smart contract.
+  stacks.StacksAddress deployer = 3;
+}
+
+// For making a `rotate-keys-wrapper` contract call in the
+// `sbtc-bootstrap-signers` smart contract.
+message RotateKeys {
+  // The new set of public keys for all known signers during this
+  // PoX cycle.
+  repeated crypto.PublicKey new_keys = 1;
+  // The aggregate key created by combining the above public keys.
+  crypto.PublicKey aggregate_key = 2;
+  // The address that deployed the contract.
+  stacks.StacksAddress deployer = 3;
+  // The number of signatures required for the multi-sig wallet.
+  uint32 signatures_required = 4;
+}
diff --git a/signer/src/proto/generated/stacks.signer.v1.rs b/signer/src/proto/generated/stacks.signer.v1.rs
index 6d179c79..d0549b52 100644
--- a/signer/src/proto/generated/stacks.signer.v1.rs
+++ b/signer/src/proto/generated/stacks.signer.v1.rs
@@ -72,21 +72,48 @@ pub struct StacksTransactionSignRequest {
     /// The aggregate public key that will sign the transaction.
     #[prost(message, optional, tag = "1")]
     pub aggregate_key: ::core::option::Option<super::super::super::crypto::PublicKey>,
-    /// The contract call transaction to sign.
-    /// pub contract_call: ContractCall,
     /// The nonce to use for the transaction.
-    #[prost(uint64, tag = "3")]
+    #[prost(uint64, tag = "2")]
     pub nonce: u64,
     /// The transaction fee in microSTX.
-    #[prost(uint64, tag = "4")]
+    #[prost(uint64, tag = "3")]
     pub tx_fee: u64,
-    /// The expected digest of the transaction than needs to be signed.
-    /// It's essentially a hash of the contract call struct, the nonce, the
-    /// tx_fee and a few other things.
-    #[prost(message, optional, tag = "5")]
+    /// The expected digest of the transaction than needs to be signed. It's
+    /// essentially a hash of the contract call struct, the nonce, the tx_fee
+    /// and a few other things.
+    #[prost(message, optional, tag = "4")]
     pub digest: ::core::option::Option<super::super::super::crypto::Uint256>,
+    /// The contract call transaction to sign.
+    #[prost(
+        oneof = "stacks_transaction_sign_request::ContractCall",
+        tags = "5, 6, 7, 8"
+    )]
+    pub contract_call: ::core::option::Option<
+        stacks_transaction_sign_request::ContractCall,
+    >,
 }
-/// A complete-deposit contract call on Stacks.
+/// Nested message and enum types in `StacksTransactionSignRequest`.
+pub mod stacks_transaction_sign_request {
+    /// The contract call transaction to sign.
+    #[allow(clippy::derive_partial_eq_without_eq)]
+    #[derive(Clone, PartialEq, ::prost::Oneof)]
+    pub enum ContractCall {
+        /// The `complete-deposit` contract call
+        #[prost(message, tag = "5")]
+        CompleteDeposit(super::CompleteDeposit),
+        /// The `accept-withdrawal-request` contract call
+        #[prost(message, tag = "6")]
+        AcceptWithdrawal(super::AcceptWithdrawal),
+        /// The `reject-withdrawal-request` contract call
+        #[prost(message, tag = "7")]
+        RejectWithdrawal(super::RejectWithdrawal),
+        /// The `rotate-keys-wrapper` contract call
+        #[prost(message, tag = "8")]
+        RotateKeys(super::RotateKeys),
+    }
+}
+/// For making a `complete-deposit` contract call in the sbtc-deposit
+/// smart contract.
 #[allow(clippy::derive_partial_eq_without_eq)]
 #[derive(Clone, PartialEq, ::prost::Message)]
 pub struct CompleteDeposit {
@@ -120,7 +147,8 @@ pub struct CompleteDeposit {
     #[prost(uint64, tag = "7")]
     pub sweep_block_height: u64,
 }
-/// The `accept-withdrawal-request` contract call on the stacks blockchain.
+/// For making a `accept-withdrawal-request` contract call in the
+/// sbtc-withdrawal smart contract.
 #[allow(clippy::derive_partial_eq_without_eq)]
 #[derive(Clone, PartialEq, ::prost::Message)]
 pub struct AcceptWithdrawal {
@@ -137,9 +165,9 @@ pub struct AcceptWithdrawal {
     /// withdrawal request.
     #[prost(uint64, tag = "3")]
     pub tx_fee: u64,
-    /// A bitmap of how the signers voted. This structure supports up to
-    /// 128 distinct signers. Here, we assume that a 1 (or true) implies
-    /// that the signer voted *against* the transaction.
+    /// A bitmap of how the signers voted. The length of the list must be less
+    /// than or equal to 128. Here, we assume that a true implies that the
+    /// associated signer voted *against* the withdrawal.
     #[prost(bool, repeated, tag = "4")]
     pub signer_bitmap: ::prost::alloc::vec::Vec<bool>,
     /// The address that deployed the contract.
@@ -155,3 +183,41 @@ pub struct AcceptWithdrawal {
     #[prost(uint64, tag = "7")]
     pub sweep_block_height: u64,
 }
+/// For making a `reject-withdrawal-request` contract call in the
+/// sbtc-withdrawal smart contract.
+#[allow(clippy::derive_partial_eq_without_eq)]
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct RejectWithdrawal {
+    /// The ID of the withdrawal request generated by the
+    /// `initiate-withdrawal-request` function in the sbtc-withdrawal smart
+    /// contract.
+    #[prost(uint64, tag = "1")]
+    pub request_id: u64,
+    /// A bitmap of how the signers voted. The length of the list must be less
+    /// than or equal to 128. Here, we assume that a true implies that the
+    /// associated signer voted *against* the withdrawal.
+    #[prost(bool, repeated, tag = "2")]
+    pub signer_bitmap: ::prost::alloc::vec::Vec<bool>,
+    /// The address that deployed the smart contract.
+    #[prost(message, optional, tag = "3")]
+    pub deployer: ::core::option::Option<super::super::StacksAddress>,
+}
+/// For making a `rotate-keys-wrapper` contract call in the
+/// `sbtc-bootstrap-signers` smart contract.
+#[allow(clippy::derive_partial_eq_without_eq)]
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct RotateKeys {
+    /// The new set of public keys for all known signers during this
+    /// PoX cycle.
+    #[prost(message, repeated, tag = "1")]
+    pub new_keys: ::prost::alloc::vec::Vec<super::super::super::crypto::PublicKey>,
+    /// The aggregate key created by combining the above public keys.
+    #[prost(message, optional, tag = "2")]
+    pub aggregate_key: ::core::option::Option<super::super::super::crypto::PublicKey>,
+    /// The address that deployed the contract.
+    #[prost(message, optional, tag = "3")]
+    pub deployer: ::core::option::Option<super::super::StacksAddress>,
+    /// The number of signatures required for the multi-sig wallet.
+    #[prost(uint32, tag = "4")]
+    pub signatures_required: u32,
+}
diff --git a/signer/src/proto/mod.rs b/signer/src/proto/mod.rs
index 36411cfa..8ee2b970 100644
--- a/signer/src/proto/mod.rs
+++ b/signer/src/proto/mod.rs
@@ -2,6 +2,7 @@
 mod generated;
 
 pub use generated::crypto::*;
+pub use generated::stacks::signer::v1::stacks_transaction_sign_request::*;
 pub use generated::stacks::signer::v1::*;
 pub use generated::stacks::signer::*;
 pub use generated::stacks::*;