diff --git a/sdk/src/instruction_compiler.rs b/sdk/src/instruction_compiler.rs
deleted file mode 100644
index b2779abb18..0000000000
--- a/sdk/src/instruction_compiler.rs
+++ /dev/null
@@ -1,239 +0,0 @@
-//! A library for compiling instructions
-
-use crate::hash::Hash;
-use crate::instruction::{CompiledInstruction, Instruction};
-use crate::message::Message;
-use crate::pubkey::Pubkey;
-use itertools::Itertools;
-
-fn position(keys: &[Pubkey], key: &Pubkey) -> u8 {
-    keys.iter().position(|k| k == key).unwrap() as u8
-}
-
-fn compile_instruction(
-    ix: &Instruction,
-    keys: &[Pubkey],
-    program_ids: &[Pubkey],
-) -> CompiledInstruction {
-    let accounts: Vec<_> = ix
-        .accounts
-        .iter()
-        .map(|account_meta| position(keys, &account_meta.pubkey))
-        .collect();
-
-    CompiledInstruction {
-        program_ids_index: position(program_ids, &ix.program_ids_index),
-        data: ix.data.clone(),
-        accounts,
-    }
-}
-
-fn compile_instructions(
-    ixs: &[Instruction],
-    keys: &[Pubkey],
-    program_ids: &[Pubkey],
-) -> Vec<CompiledInstruction> {
-    ixs.iter()
-        .map(|ix| compile_instruction(ix, keys, program_ids))
-        .collect()
-}
-
-/// A utility for constructing transactions
-pub struct InstructionCompiler {
-    instructions: Vec<Instruction>,
-}
-
-impl InstructionCompiler {
-    /// Create a new unsigned transaction from a single instruction
-    pub fn new(instructions: Vec<Instruction>) -> Self {
-        Self { instructions }
-    }
-
-    /// Return pubkeys referenced by all instructions, with the ones needing signatures first.
-    /// No duplicates and order is preserved.
-    fn keys(&self) -> (Vec<Pubkey>, Vec<Pubkey>) {
-        let mut keys_and_signed: Vec<_> = self
-            .instructions
-            .iter()
-            .flat_map(|ix| ix.accounts.iter())
-            .collect();
-        keys_and_signed.sort_by(|x, y| y.is_signer.cmp(&x.is_signer));
-
-        let mut signed_keys = vec![];
-        let mut unsigned_keys = vec![];
-        for account_meta in keys_and_signed.into_iter().unique_by(|x| x.pubkey) {
-            if account_meta.is_signer {
-                signed_keys.push(account_meta.pubkey);
-            } else {
-                unsigned_keys.push(account_meta.pubkey);
-            }
-        }
-        (signed_keys, unsigned_keys)
-    }
-
-    /// Return program ids referenced by all instructions.  No duplicates and order is preserved.
-    fn program_ids(&self) -> Vec<Pubkey> {
-        self.instructions
-            .iter()
-            .map(|ix| ix.program_ids_index)
-            .unique()
-            .collect()
-    }
-
-    /// Return an unsigned transaction with space for requires signatures.
-    pub fn compile(&self) -> Message {
-        let program_ids = self.program_ids();
-        let (mut signed_keys, unsigned_keys) = self.keys();
-        let num_signatures = signed_keys.len() as u8;
-        signed_keys.extend(&unsigned_keys);
-        let instructions = compile_instructions(&self.instructions, &signed_keys, &program_ids);
-        Message {
-            num_signatures,
-            account_keys: signed_keys,
-            recent_blockhash: Hash::default(),
-            fee: 0,
-            program_ids,
-            instructions,
-        }
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use crate::instruction::AccountMeta;
-    use crate::signature::{Keypair, KeypairUtil};
-
-    #[test]
-    fn test_transaction_builder_unique_program_ids() {
-        let program_id0 = Pubkey::default();
-        let program_ids = InstructionCompiler::new(vec![
-            Instruction::new(program_id0, &0, vec![]),
-            Instruction::new(program_id0, &0, vec![]),
-        ])
-        .program_ids();
-        assert_eq!(program_ids, vec![program_id0]);
-    }
-
-    #[test]
-    fn test_transaction_builder_unique_program_ids_not_adjacent() {
-        let program_id0 = Pubkey::default();
-        let program_id1 = Keypair::new().pubkey();
-        let program_ids = InstructionCompiler::new(vec![
-            Instruction::new(program_id0, &0, vec![]),
-            Instruction::new(program_id1, &0, vec![]),
-            Instruction::new(program_id0, &0, vec![]),
-        ])
-        .program_ids();
-        assert_eq!(program_ids, vec![program_id0, program_id1]);
-    }
-
-    #[test]
-    fn test_transaction_builder_unique_program_ids_order_preserved() {
-        let program_id0 = Keypair::new().pubkey();
-        let program_id1 = Pubkey::default(); // Key less than program_id0
-        let program_ids = InstructionCompiler::new(vec![
-            Instruction::new(program_id0, &0, vec![]),
-            Instruction::new(program_id1, &0, vec![]),
-            Instruction::new(program_id0, &0, vec![]),
-        ])
-        .program_ids();
-        assert_eq!(program_ids, vec![program_id0, program_id1]);
-    }
-
-    #[test]
-    fn test_transaction_builder_unique_keys_both_signed() {
-        let program_id = Pubkey::default();
-        let id0 = Pubkey::default();
-        let keys = InstructionCompiler::new(vec![
-            Instruction::new(program_id, &0, vec![AccountMeta::new(id0, true)]),
-            Instruction::new(program_id, &0, vec![AccountMeta::new(id0, true)]),
-        ])
-        .keys();
-        assert_eq!(keys, (vec![id0], vec![]));
-    }
-
-    #[test]
-    fn test_transaction_builder_unique_keys_one_signed() {
-        let program_id = Pubkey::default();
-        let id0 = Pubkey::default();
-        let keys = InstructionCompiler::new(vec![
-            Instruction::new(program_id, &0, vec![AccountMeta::new(id0, false)]),
-            Instruction::new(program_id, &0, vec![AccountMeta::new(id0, true)]),
-        ])
-        .keys();
-        assert_eq!(keys, (vec![id0], vec![]));
-    }
-
-    #[test]
-    fn test_transaction_builder_unique_keys_order_preserved() {
-        let program_id = Pubkey::default();
-        let id0 = Keypair::new().pubkey();
-        let id1 = Pubkey::default(); // Key less than id0
-        let keys = InstructionCompiler::new(vec![
-            Instruction::new(program_id, &0, vec![AccountMeta::new(id0, false)]),
-            Instruction::new(program_id, &0, vec![AccountMeta::new(id1, false)]),
-        ])
-        .keys();
-        assert_eq!(keys, (vec![], vec![id0, id1]));
-    }
-
-    #[test]
-    fn test_transaction_builder_unique_keys_not_adjacent() {
-        let program_id = Pubkey::default();
-        let id0 = Pubkey::default();
-        let id1 = Keypair::new().pubkey();
-        let keys = InstructionCompiler::new(vec![
-            Instruction::new(program_id, &0, vec![AccountMeta::new(id0, false)]),
-            Instruction::new(program_id, &0, vec![AccountMeta::new(id1, false)]),
-            Instruction::new(program_id, &0, vec![AccountMeta::new(id0, true)]),
-        ])
-        .keys();
-        assert_eq!(keys, (vec![id0], vec![id1]));
-    }
-
-    #[test]
-    fn test_transaction_builder_signed_keys_first() {
-        let program_id = Pubkey::default();
-        let id0 = Pubkey::default();
-        let id1 = Keypair::new().pubkey();
-        let keys = InstructionCompiler::new(vec![
-            Instruction::new(program_id, &0, vec![AccountMeta::new(id0, false)]),
-            Instruction::new(program_id, &0, vec![AccountMeta::new(id1, true)]),
-        ])
-        .keys();
-        assert_eq!(keys, (vec![id1], vec![id0]));
-    }
-
-    #[test]
-    // Ensure there's a way to calculate the number of required signatures.
-    fn test_transaction_builder_signed_keys_len() {
-        let program_id = Pubkey::default();
-        let id0 = Pubkey::default();
-        let ix = Instruction::new(program_id, &0, vec![AccountMeta::new(id0, false)]);
-        let message = InstructionCompiler::new(vec![ix]).compile();
-        assert_eq!(message.num_signatures, 0);
-
-        let ix = Instruction::new(program_id, &0, vec![AccountMeta::new(id0, true)]);
-        let message = InstructionCompiler::new(vec![ix]).compile();
-        assert_eq!(message.num_signatures, 1);
-    }
-
-    #[test]
-    fn test_transaction_builder_kitchen_sink() {
-        let program_id0 = Pubkey::default();
-        let program_id1 = Keypair::new().pubkey();
-        let id0 = Pubkey::default();
-        let keypair1 = Keypair::new();
-        let id1 = keypair1.pubkey();
-        let tx = InstructionCompiler::new(vec![
-            Instruction::new(program_id0, &0, vec![AccountMeta::new(id0, false)]),
-            Instruction::new(program_id1, &0, vec![AccountMeta::new(id1, true)]),
-            Instruction::new(program_id0, &0, vec![AccountMeta::new(id1, false)]),
-        ])
-        .compile();
-        assert_eq!(tx.instructions[0], CompiledInstruction::new(0, &0, vec![1]));
-        assert_eq!(tx.instructions[1], CompiledInstruction::new(1, &0, vec![0]));
-        assert_eq!(tx.instructions[2], CompiledInstruction::new(0, &0, vec![0]));
-    }
-}
diff --git a/sdk/src/lib.rs b/sdk/src/lib.rs
index 436c30e62f..212cd7994e 100644
--- a/sdk/src/lib.rs
+++ b/sdk/src/lib.rs
@@ -3,7 +3,6 @@ pub mod bpf_loader;
 pub mod genesis_block;
 pub mod hash;
 pub mod instruction;
-mod instruction_compiler;
 pub mod loader_instruction;
 mod message;
 pub mod native_loader;
diff --git a/sdk/src/message.rs b/sdk/src/message.rs
index 8ce9f76f16..2c1a533a8d 100644
--- a/sdk/src/message.rs
+++ b/sdk/src/message.rs
@@ -1,6 +1,101 @@
+//! A library for compiling instructions
+
 use crate::hash::Hash;
-use crate::instruction::CompiledInstruction;
+use crate::instruction::{CompiledInstruction, Instruction};
 use crate::pubkey::Pubkey;
+use itertools::Itertools;
+
+fn position(keys: &[Pubkey], key: &Pubkey) -> u8 {
+    keys.iter().position(|k| k == key).unwrap() as u8
+}
+
+fn compile_instruction(
+    ix: &Instruction,
+    keys: &[Pubkey],
+    program_ids: &[Pubkey],
+) -> CompiledInstruction {
+    let accounts: Vec<_> = ix
+        .accounts
+        .iter()
+        .map(|account_meta| position(keys, &account_meta.pubkey))
+        .collect();
+
+    CompiledInstruction {
+        program_ids_index: position(program_ids, &ix.program_ids_index),
+        data: ix.data.clone(),
+        accounts,
+    }
+}
+
+fn compile_instructions(
+    ixs: &[Instruction],
+    keys: &[Pubkey],
+    program_ids: &[Pubkey],
+) -> Vec<CompiledInstruction> {
+    ixs.iter()
+        .map(|ix| compile_instruction(ix, keys, program_ids))
+        .collect()
+}
+
+/// A utility for constructing transactions
+pub struct InstructionCompiler {
+    instructions: Vec<Instruction>,
+}
+
+impl InstructionCompiler {
+    /// Create a new unsigned transaction from a single instruction
+    pub fn new(instructions: Vec<Instruction>) -> Self {
+        Self { instructions }
+    }
+
+    /// Return pubkeys referenced by all instructions, with the ones needing signatures first.
+    /// No duplicates and order is preserved.
+    fn keys(&self) -> (Vec<Pubkey>, Vec<Pubkey>) {
+        let mut keys_and_signed: Vec<_> = self
+            .instructions
+            .iter()
+            .flat_map(|ix| ix.accounts.iter())
+            .collect();
+        keys_and_signed.sort_by(|x, y| y.is_signer.cmp(&x.is_signer));
+
+        let mut signed_keys = vec![];
+        let mut unsigned_keys = vec![];
+        for account_meta in keys_and_signed.into_iter().unique_by(|x| x.pubkey) {
+            if account_meta.is_signer {
+                signed_keys.push(account_meta.pubkey);
+            } else {
+                unsigned_keys.push(account_meta.pubkey);
+            }
+        }
+        (signed_keys, unsigned_keys)
+    }
+
+    /// Return program ids referenced by all instructions.  No duplicates and order is preserved.
+    fn program_ids(&self) -> Vec<Pubkey> {
+        self.instructions
+            .iter()
+            .map(|ix| ix.program_ids_index)
+            .unique()
+            .collect()
+    }
+
+    /// Return an unsigned transaction with space for requires signatures.
+    pub fn compile(&self) -> Message {
+        let program_ids = self.program_ids();
+        let (mut signed_keys, unsigned_keys) = self.keys();
+        let num_signatures = signed_keys.len() as u8;
+        signed_keys.extend(&unsigned_keys);
+        let instructions = compile_instructions(&self.instructions, &signed_keys, &program_ids);
+        Message {
+            num_signatures,
+            account_keys: signed_keys,
+            recent_blockhash: Hash::default(),
+            fee: 0,
+            program_ids,
+            instructions,
+        }
+    }
+}
 
 #[derive(Debug, PartialEq, Eq, Clone)]
 pub struct Message {
@@ -11,3 +106,149 @@ pub struct Message {
     pub program_ids: Vec<Pubkey>,
     pub instructions: Vec<CompiledInstruction>,
 }
+
+impl Message {
+    pub fn new(instructions: Vec<Instruction>) -> Self {
+        InstructionCompiler::new(instructions).compile()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::instruction::AccountMeta;
+    use crate::signature::{Keypair, KeypairUtil};
+
+    #[test]
+    fn test_transaction_builder_unique_program_ids() {
+        let program_id0 = Pubkey::default();
+        let program_ids = InstructionCompiler::new(vec![
+            Instruction::new(program_id0, &0, vec![]),
+            Instruction::new(program_id0, &0, vec![]),
+        ])
+        .program_ids();
+        assert_eq!(program_ids, vec![program_id0]);
+    }
+
+    #[test]
+    fn test_transaction_builder_unique_program_ids_not_adjacent() {
+        let program_id0 = Pubkey::default();
+        let program_id1 = Keypair::new().pubkey();
+        let program_ids = InstructionCompiler::new(vec![
+            Instruction::new(program_id0, &0, vec![]),
+            Instruction::new(program_id1, &0, vec![]),
+            Instruction::new(program_id0, &0, vec![]),
+        ])
+        .program_ids();
+        assert_eq!(program_ids, vec![program_id0, program_id1]);
+    }
+
+    #[test]
+    fn test_transaction_builder_unique_program_ids_order_preserved() {
+        let program_id0 = Keypair::new().pubkey();
+        let program_id1 = Pubkey::default(); // Key less than program_id0
+        let program_ids = InstructionCompiler::new(vec![
+            Instruction::new(program_id0, &0, vec![]),
+            Instruction::new(program_id1, &0, vec![]),
+            Instruction::new(program_id0, &0, vec![]),
+        ])
+        .program_ids();
+        assert_eq!(program_ids, vec![program_id0, program_id1]);
+    }
+
+    #[test]
+    fn test_transaction_builder_unique_keys_both_signed() {
+        let program_id = Pubkey::default();
+        let id0 = Pubkey::default();
+        let keys = InstructionCompiler::new(vec![
+            Instruction::new(program_id, &0, vec![AccountMeta::new(id0, true)]),
+            Instruction::new(program_id, &0, vec![AccountMeta::new(id0, true)]),
+        ])
+        .keys();
+        assert_eq!(keys, (vec![id0], vec![]));
+    }
+
+    #[test]
+    fn test_transaction_builder_unique_keys_one_signed() {
+        let program_id = Pubkey::default();
+        let id0 = Pubkey::default();
+        let keys = InstructionCompiler::new(vec![
+            Instruction::new(program_id, &0, vec![AccountMeta::new(id0, false)]),
+            Instruction::new(program_id, &0, vec![AccountMeta::new(id0, true)]),
+        ])
+        .keys();
+        assert_eq!(keys, (vec![id0], vec![]));
+    }
+
+    #[test]
+    fn test_transaction_builder_unique_keys_order_preserved() {
+        let program_id = Pubkey::default();
+        let id0 = Keypair::new().pubkey();
+        let id1 = Pubkey::default(); // Key less than id0
+        let keys = InstructionCompiler::new(vec![
+            Instruction::new(program_id, &0, vec![AccountMeta::new(id0, false)]),
+            Instruction::new(program_id, &0, vec![AccountMeta::new(id1, false)]),
+        ])
+        .keys();
+        assert_eq!(keys, (vec![], vec![id0, id1]));
+    }
+
+    #[test]
+    fn test_transaction_builder_unique_keys_not_adjacent() {
+        let program_id = Pubkey::default();
+        let id0 = Pubkey::default();
+        let id1 = Keypair::new().pubkey();
+        let keys = InstructionCompiler::new(vec![
+            Instruction::new(program_id, &0, vec![AccountMeta::new(id0, false)]),
+            Instruction::new(program_id, &0, vec![AccountMeta::new(id1, false)]),
+            Instruction::new(program_id, &0, vec![AccountMeta::new(id0, true)]),
+        ])
+        .keys();
+        assert_eq!(keys, (vec![id0], vec![id1]));
+    }
+
+    #[test]
+    fn test_transaction_builder_signed_keys_first() {
+        let program_id = Pubkey::default();
+        let id0 = Pubkey::default();
+        let id1 = Keypair::new().pubkey();
+        let keys = InstructionCompiler::new(vec![
+            Instruction::new(program_id, &0, vec![AccountMeta::new(id0, false)]),
+            Instruction::new(program_id, &0, vec![AccountMeta::new(id1, true)]),
+        ])
+        .keys();
+        assert_eq!(keys, (vec![id1], vec![id0]));
+    }
+
+    #[test]
+    // Ensure there's a way to calculate the number of required signatures.
+    fn test_transaction_builder_signed_keys_len() {
+        let program_id = Pubkey::default();
+        let id0 = Pubkey::default();
+        let ix = Instruction::new(program_id, &0, vec![AccountMeta::new(id0, false)]);
+        let message = InstructionCompiler::new(vec![ix]).compile();
+        assert_eq!(message.num_signatures, 0);
+
+        let ix = Instruction::new(program_id, &0, vec![AccountMeta::new(id0, true)]);
+        let message = InstructionCompiler::new(vec![ix]).compile();
+        assert_eq!(message.num_signatures, 1);
+    }
+
+    #[test]
+    fn test_transaction_builder_kitchen_sink() {
+        let program_id0 = Pubkey::default();
+        let program_id1 = Keypair::new().pubkey();
+        let id0 = Pubkey::default();
+        let keypair1 = Keypair::new();
+        let id1 = keypair1.pubkey();
+        let tx = InstructionCompiler::new(vec![
+            Instruction::new(program_id0, &0, vec![AccountMeta::new(id0, false)]),
+            Instruction::new(program_id1, &0, vec![AccountMeta::new(id1, true)]),
+            Instruction::new(program_id0, &0, vec![AccountMeta::new(id1, false)]),
+        ])
+        .compile();
+        assert_eq!(tx.instructions[0], CompiledInstruction::new(0, &0, vec![1]));
+        assert_eq!(tx.instructions[1], CompiledInstruction::new(1, &0, vec![0]));
+        assert_eq!(tx.instructions[2], CompiledInstruction::new(0, &0, vec![0]));
+    }
+}
diff --git a/sdk/src/transaction.rs b/sdk/src/transaction.rs
index b8e6ce3aed..ebe2e56c84 100644
--- a/sdk/src/transaction.rs
+++ b/sdk/src/transaction.rs
@@ -2,7 +2,6 @@
 
 use crate::hash::{Hash, Hasher};
 use crate::instruction::{AccountMeta, CompiledInstruction, Instruction, InstructionError};
-use crate::instruction_compiler::InstructionCompiler;
 use crate::message::Message;
 use crate::packet::PACKET_DATA_SIZE;
 use crate::pubkey::Pubkey;
@@ -73,7 +72,7 @@ pub struct Transaction {
 }
 
 impl Transaction {
-    pub fn new_message(message: Message) -> Self {
+    fn new_with_message(message: Message) -> Self {
         Self {
             signatures: Vec::with_capacity(message.num_signatures as usize),
             account_keys: message.account_keys,
@@ -85,8 +84,8 @@ impl Transaction {
     }
 
     pub fn new(instructions: Vec<Instruction>) -> Self {
-        let message = InstructionCompiler::new(instructions).compile();
-        Self::new_message(message)
+        let message = Message::new(instructions);
+        Self::new_with_message(message)
     }
 
     pub fn new_signed_instructions<T: KeypairUtil>(