diff --git a/sdk/src/lib.rs b/sdk/src/lib.rs
index 64f89324ee..897a1db49b 100644
--- a/sdk/src/lib.rs
+++ b/sdk/src/lib.rs
@@ -40,6 +40,7 @@ pub mod rpc_port;
 pub mod secp256k1_instruction;
 pub mod shred_version;
 pub mod signature;
+pub mod signer;
 pub mod signers;
 pub mod stake_weighted_timestamp;
 pub mod system_transaction;
diff --git a/sdk/src/signature.rs b/sdk/src/signature.rs
index 8102b9582a..d91a8ba2b6 100644
--- a/sdk/src/signature.rs
+++ b/sdk/src/signature.rs
@@ -1,12 +1,11 @@
 //! The `signature` module provides functionality for public, and private keys.
 #![cfg(feature = "full")]
 
-use crate::{derivation_path::DerivationPath, pubkey::Pubkey, transaction::TransactionError};
+use crate::{derivation_path::DerivationPath, pubkey::Pubkey};
 use ed25519_dalek::Signer as DalekSigner;
 use ed25519_dalek_bip32::Error as Bip32Error;
 use generic_array::{typenum::U64, GenericArray};
 use hmac::Hmac;
-use itertools::Itertools;
 use rand::{rngs::OsRng, CryptoRng, RngCore};
 use std::{
     borrow::{Borrow, Cow},
@@ -20,6 +19,9 @@ use std::{
 };
 use thiserror::Error;
 
+// legacy module paths
+pub use crate::signer::*;
+
 #[derive(Debug)]
 pub struct Keypair(ed25519_dalek::Keypair);
 
@@ -158,34 +160,6 @@ impl FromStr for Signature {
     }
 }
 
-pub trait Signer {
-    fn pubkey(&self) -> Pubkey {
-        self.try_pubkey().unwrap_or_default()
-    }
-    fn try_pubkey(&self) -> Result<Pubkey, SignerError>;
-    fn sign_message(&self, message: &[u8]) -> Signature {
-        self.try_sign_message(message).unwrap_or_default()
-    }
-    fn try_sign_message(&self, message: &[u8]) -> Result<Signature, SignerError>;
-}
-
-impl PartialEq for dyn Signer {
-    fn eq(&self, other: &dyn Signer) -> bool {
-        self.pubkey() == other.pubkey()
-    }
-}
-
-impl std::fmt::Debug for dyn Signer {
-    fn fmt(&self, fmt: &mut std::fmt::Formatter) -> std::fmt::Result {
-        write!(fmt, "Signer: {:?}", self.pubkey())
-    }
-}
-
-/// Remove duplicates signers while preserving order. O(n²)
-pub fn unique_signers(signers: Vec<&dyn Signer>) -> Vec<&dyn Signer> {
-    signers.into_iter().unique_by(|s| s.pubkey()).collect()
-}
-
 impl Signer for Keypair {
     /// Return the public key for the given keypair
     fn pubkey(&self) -> Pubkey {
@@ -214,50 +188,6 @@ where
     }
 }
 
-impl<T> From<T> for Box<dyn Signer>
-where
-    T: Signer + 'static,
-{
-    fn from(signer: T) -> Self {
-        Box::new(signer)
-    }
-}
-
-#[derive(Debug, Error, PartialEq)]
-pub enum SignerError {
-    #[error("keypair-pubkey mismatch")]
-    KeypairPubkeyMismatch,
-
-    #[error("not enough signers")]
-    NotEnoughSigners,
-
-    #[error("transaction error")]
-    TransactionError(#[from] TransactionError),
-
-    #[error("custom error: {0}")]
-    Custom(String),
-
-    // Presigner-specific Errors
-    #[error("presigner error")]
-    PresignerError(#[from] PresignerError),
-
-    // Remote Keypair-specific Errors
-    #[error("connection error: {0}")]
-    Connection(String),
-
-    #[error("invalid input: {0}")]
-    InvalidInput(String),
-
-    #[error("no device found")]
-    NoDeviceFound,
-
-    #[error("{0}")]
-    Protocol(String),
-
-    #[error("{0}")]
-    UserCancel(String),
-}
-
 #[derive(Clone, Debug, Default)]
 pub struct Presigner {
     pubkey: Pubkey,
@@ -629,20 +559,6 @@ mod tests {
         assert_eq!(presigner, presigner2);
     }
 
-    fn pubkeys(signers: &[&dyn Signer]) -> Vec<Pubkey> {
-        signers.iter().map(|x| x.pubkey()).collect()
-    }
-
-    #[test]
-    fn test_unique_signers() {
-        let alice = Keypair::new();
-        let bob = Keypair::new();
-        assert_eq!(
-            pubkeys(&unique_signers(vec![&alice, &bob, &alice])),
-            pubkeys(&[&alice, &bob])
-        );
-    }
-
     #[test]
     fn test_off_curve_pubkey_verify_fails() {
         // Golden point off the ed25519 curve
diff --git a/sdk/src/signer/mod.rs b/sdk/src/signer/mod.rs
new file mode 100644
index 0000000000..dc81d8257f
--- /dev/null
+++ b/sdk/src/signer/mod.rs
@@ -0,0 +1,114 @@
+#![cfg(feature = "full")]
+
+use {
+    crate::{
+        pubkey::Pubkey,
+        signature::{PresignerError, Signature},
+        transaction::TransactionError,
+    },
+    itertools::Itertools,
+    thiserror::Error,
+};
+
+pub mod keypair;
+
+#[derive(Debug, Error, PartialEq)]
+pub enum SignerError {
+    #[error("keypair-pubkey mismatch")]
+    KeypairPubkeyMismatch,
+
+    #[error("not enough signers")]
+    NotEnoughSigners,
+
+    #[error("transaction error")]
+    TransactionError(#[from] TransactionError),
+
+    #[error("custom error: {0}")]
+    Custom(String),
+
+    // Presigner-specific Errors
+    #[error("presigner error")]
+    PresignerError(#[from] PresignerError),
+
+    // Remote Keypair-specific Errors
+    #[error("connection error: {0}")]
+    Connection(String),
+
+    #[error("invalid input: {0}")]
+    InvalidInput(String),
+
+    #[error("no device found")]
+    NoDeviceFound,
+
+    #[error("{0}")]
+    Protocol(String),
+
+    #[error("{0}")]
+    UserCancel(String),
+}
+
+/// The `Signer` trait declares operations that all digital signature providers
+/// must support. It is the primary interface by which signers are specified in
+/// `Transaction` signing interfaces
+pub trait Signer {
+    /// Infallibly gets the implementor's public key. Returns the all-zeros
+    /// `Pubkey` if the implementor has none.
+    fn pubkey(&self) -> Pubkey {
+        self.try_pubkey().unwrap_or_default()
+    }
+    /// Fallibly gets the implementor's public key
+    fn try_pubkey(&self) -> Result<Pubkey, SignerError>;
+    /// Invallibly produces an Ed25519 signature over the provided `message`
+    /// bytes. Returns the all-zeros `Signature` if signing is not possible.
+    fn sign_message(&self, message: &[u8]) -> Signature {
+        self.try_sign_message(message).unwrap_or_default()
+    }
+    /// Fallibly produces an Ed25519 signature over the provided `message` bytes.
+    fn try_sign_message(&self, message: &[u8]) -> Result<Signature, SignerError>;
+}
+
+impl<T> From<T> for Box<dyn Signer>
+where
+    T: Signer + 'static,
+{
+    fn from(signer: T) -> Self {
+        Box::new(signer)
+    }
+}
+
+impl PartialEq for dyn Signer {
+    fn eq(&self, other: &dyn Signer) -> bool {
+        self.pubkey() == other.pubkey()
+    }
+}
+
+impl std::fmt::Debug for dyn Signer {
+    fn fmt(&self, fmt: &mut std::fmt::Formatter) -> std::fmt::Result {
+        write!(fmt, "Signer: {:?}", self.pubkey())
+    }
+}
+
+/// Removes duplicate signers while preserving order. O(n²)
+pub fn unique_signers(signers: Vec<&dyn Signer>) -> Vec<&dyn Signer> {
+    signers.into_iter().unique_by(|s| s.pubkey()).collect()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::signer::keypair::Keypair;
+
+    fn pubkeys(signers: &[&dyn Signer]) -> Vec<Pubkey> {
+        signers.iter().map(|x| x.pubkey()).collect()
+    }
+
+    #[test]
+    fn test_unique_signers() {
+        let alice = Keypair::new();
+        let bob = Keypair::new();
+        assert_eq!(
+            pubkeys(&unique_signers(vec![&alice, &bob, &alice])),
+            pubkeys(&[&alice, &bob])
+        );
+    }
+}