diff --git a/packages/patchlogr-core/src/partition/partition.ts b/packages/patchlogr-core/src/partition/partition.ts
index 42b2b03..2fd755b 100644
--- a/packages/patchlogr-core/src/partition/partition.ts
+++ b/packages/patchlogr-core/src/partition/partition.ts
@@ -1,14 +1,10 @@
-export type PartitionManifest = {
-    key: string;
-    hash: string;
-};
-
 export type Partition = {
     hash: string;
     operationKey: string;
 };
 
 export type PartitionedSpec = {
+    hash: string;
     metadata: Record<string, unknown>;
     partitions: Map<string, Partition[]>;
 };
diff --git a/packages/patchlogr-core/src/partition/partitionByMethod.ts b/packages/patchlogr-core/src/partition/partitionByMethod.ts
index 67524f6..8804bb0 100644
--- a/packages/patchlogr-core/src/partition/partitionByMethod.ts
+++ b/packages/patchlogr-core/src/partition/partitionByMethod.ts
@@ -17,6 +17,7 @@ export function partitionByMethod(spec: CanonicalSpec): PartitionedSpec {
     });
 
     return {
+        hash: createSHA256Hash(stableStringify(spec)),
         metadata: {
             ...spec.info,
             ...spec.security,
diff --git a/packages/patchlogr-core/src/partition/partitionByTag.ts b/packages/patchlogr-core/src/partition/partitionByTag.ts
index da5c6b4..f8a9699 100644
--- a/packages/patchlogr-core/src/partition/partitionByTag.ts
+++ b/packages/patchlogr-core/src/partition/partitionByTag.ts
@@ -19,6 +19,7 @@ export function partitionByTag(spec: CanonicalSpec): PartitionedSpec {
     });
 
     return {
+        hash: createSHA256Hash(stableStringify(spec)),
         metadata: {
             ...spec.info,
             ...spec.security,
diff --git a/packages/patchlogr-types/src/index.ts b/packages/patchlogr-types/src/index.ts
index d277dfb..02c3ac6 100644
--- a/packages/patchlogr-types/src/index.ts
+++ b/packages/patchlogr-types/src/index.ts
@@ -188,7 +188,7 @@ export type CanonicalOperation = CanonicalOperationContract & {
     doc?: CanonicalOperationDoc;
 };
 
-export interface CanonicalSpec {
+export type CanonicalSpec = {
     info?: {
         title?: string;
         version?: string;
@@ -202,4 +202,4 @@ export interface CanonicalSpec {
      */
     security?: CanonicalSecurityRequirement[];
     operations: Record<OperationKey, CanonicalOperation>;
-}
+};