diff --git a/yarn-project/circuits.js/src/contract/artifact_hash.test.ts b/yarn-project/circuits.js/src/contract/artifact_hash.test.ts
index c6261e83bd1..c965dbc57b5 100644
--- a/yarn-project/circuits.js/src/contract/artifact_hash.test.ts
+++ b/yarn-project/circuits.js/src/contract/artifact_hash.test.ts
@@ -1,6 +1,7 @@
 import { type ContractArtifact } from '@aztec/foundation/abi';
 
 import { computeArtifactHash } from './artifact_hash.js';
+import { getTestContractArtifact } from '../tests/fixtures.js';
 
 describe('ArtifactHash', () => {
   it('calculates the artifact hash', () => {
@@ -19,4 +20,14 @@ describe('ArtifactHash', () => {
       `"0x0c6fd9b48570721c5d36f978d084d77cacbfd2814f1344985f40e62bea6e61be"`,
     );
   });
+
+  it('calculates the test contract artifact hash multiple times to ensure deterministic hashing', () => {
+    const testArtifact = getTestContractArtifact();
+
+    for (let i = 0; i < 1000; i++) {
+      expect(computeArtifactHash(testArtifact).toString()).toMatchInlineSnapshot(
+        `"0x193c8f0e49d2a1b865f8afec829f3cf0bc136232ce7d09f823192dcc3e876df2"`,
+      );
+    }
+  });
 });
diff --git a/yarn-project/types/src/abi/contract_artifact.ts b/yarn-project/types/src/abi/contract_artifact.ts
index 4fc0616e78c..cf11ecf5aa3 100644
--- a/yarn-project/types/src/abi/contract_artifact.ts
+++ b/yarn-project/types/src/abi/contract_artifact.ts
@@ -4,6 +4,7 @@ import {
   type AbiType,
   type BasicValue,
   type ContractArtifact,
+  ContractArtifactSchema,
   type ContractNote,
   type FieldLayout,
   type FunctionArtifact,
@@ -133,7 +134,10 @@ type NoirCompiledContractFunction = NoirCompiledContract['functions'][number];
  * @param contract - Parent contract.
  * @returns Function artifact.
  */
-function generateFunctionArtifact(fn: NoirCompiledContractFunction, contract: NoirCompiledContract): FunctionArtifact {
+function generateFunctionArtifact(
+  fn: NoirCompiledContractFunction,
+  contract: NoirCompiledContract,
+): Omit<FunctionArtifact, 'bytecode'> & { bytecode: string } {
   if (fn.custom_attributes === undefined) {
     throw new Error(
       `No custom attributes found for contract function ${fn.name}. Try rebuilding the contract with the latest nargo version.`,
@@ -178,7 +182,7 @@ function generateFunctionArtifact(fn: NoirCompiledContractFunction, contract: No
     isInitializer: fn.custom_attributes.includes(AZTEC_INITIALIZER_ATTRIBUTE),
     parameters,
     returnTypes,
-    bytecode: Buffer.from(fn.bytecode, 'base64'),
+    bytecode: fn.bytecode,
     debugSymbols: fn.debug_symbols,
     errorTypes: fn.abi.error_types,
     ...(fn.assert_messages ? { assertMessages: fn.assert_messages } : undefined),
@@ -238,11 +242,11 @@ function getStorageLayout(input: NoirCompiledContract) {
     return {};
   }
 
-  return storageFields.reduce((acc: Record<string, FieldLayout>, field) => {
+  return storageFields.reduce((acc: Record<string, Omit<FieldLayout, 'slot'> & { slot: string }>, field) => {
     const name = field.name;
     const slot = field.value.fields[0].value as IntegerValue;
     acc[name] = {
-      slot: Fr.fromString(slot.value),
+      slot: slot.value,
     };
     return acc;
   }, {});
@@ -262,7 +266,7 @@ function getNoteTypes(input: NoirCompiledContract) {
     return {};
   }
 
-  return notes.reduce((acc: Record<string, ContractNote>, note) => {
+  return notes.reduce((acc: Record<string, Omit<ContractNote, 'id'> & { id: string }>, note) => {
     const noteFields = note.fields;
 
     // We find note type id by looking for respective kinds as each of them is unique
@@ -274,7 +278,7 @@ function getNoteTypes(input: NoirCompiledContract) {
       throw new Error(`Could not find note type id, name or fields for note ${note}`);
     }
 
-    const noteTypeId = NoteSelector.fromField(Fr.fromString(rawNoteTypeId.value));
+    const noteTypeId = rawNoteTypeId.value as string;
     const name = rawName.value as string;
 
     // Note type id is encoded as a hex string
@@ -301,7 +305,7 @@ function getNoteTypes(input: NoirCompiledContract) {
  */
 function generateContractArtifact(contract: NoirCompiledContract, aztecNrVersion?: string): ContractArtifact {
   try {
-    return {
+    return ContractArtifactSchema.parse({
       name: contract.name,
       functions: contract.functions.map(f => generateFunctionArtifact(f, contract)),
       outputs: contract.outputs,
@@ -309,7 +313,7 @@ function generateContractArtifact(contract: NoirCompiledContract, aztecNrVersion
       notes: getNoteTypes(contract),
       fileMap: contract.file_map,
       ...(aztecNrVersion ? { aztecNrVersion } : {}),
-    };
+    });
   } catch (err) {
     throw new Error(`Could not generate contract artifact for ${contract.name}: ${err}`);
   }