diff --git a/lib/permissions/minimally-encoded-thread-permissions.js b/lib/permissions/minimally-encoded-thread-permissions.js
--- a/lib/permissions/minimally-encoded-thread-permissions.js
+++ b/lib/permissions/minimally-encoded-thread-permissions.js
@@ -6,6 +6,7 @@
 import type {
   ThreadPermission,
   ThreadPermissionsInfo,
+  ThreadRolePermissionsBlob,
 } from '../types/thread-permission-types.js';
 import { entries, invertObjectToMap } from '../utils/objects.js';
 
@@ -163,9 +164,15 @@
   return `${propagationPrefixString}${filterPrefixString}${basePermissionString}`;
 };
 
+const threadRolePermissionsBlobToBitmaskArray = (
+  threadRolePermissionsBlob: ThreadRolePermissionsBlob,
+): $ReadOnlyArray<string> =>
+  Object.keys(threadRolePermissionsBlob).map(rolePermissionToBitmaskHex);
+
 export {
   permissionsToBitmaskHex,
   hasPermission,
   rolePermissionToBitmaskHex,
   decodeRolePermissionBitmask,
+  threadRolePermissionsBlobToBitmaskArray,
 };
diff --git a/lib/permissions/minimally-encoded-thread-permissions.test.js b/lib/permissions/minimally-encoded-thread-permissions.test.js
--- a/lib/permissions/minimally-encoded-thread-permissions.test.js
+++ b/lib/permissions/minimally-encoded-thread-permissions.test.js
@@ -5,7 +5,9 @@
   hasPermission,
   permissionsToBitmaskHex,
   rolePermissionToBitmaskHex,
+  threadRolePermissionsBlobToBitmaskArray,
 } from './minimally-encoded-thread-permissions.js';
+import type { ThreadRolePermissionsBlob } from '../types/thread-permission-types.js';
 
 describe('minimallyEncodedThreadPermissions', () => {
   const permissions = {
@@ -125,3 +127,83 @@
     expect(decodeRolePermissionBitmask('008')).toBe('child_know_of');
   });
 });
+
+describe('threadRolePermissionsBlobToBitmaskArray', () => {
+  const permissions: ThreadRolePermissionsBlob = {
+    add_members: true,
+    child_open_join_thread: true,
+    create_sidebars: true,
+    create_subthreads: true,
+    descendant_open_know_of: true,
+    descendant_open_visible: true,
+    descendant_opentoplevel_join_thread: true,
+    edit_entries: true,
+    edit_message: true,
+    edit_permissions: true,
+    edit_thread: true,
+    edit_thread_avatar: true,
+    edit_thread_color: true,
+    edit_thread_description: true,
+    know_of: true,
+    leave_thread: true,
+    react_to_message: true,
+    remove_members: true,
+    visible: true,
+    voiced: true,
+    open_know_of: true,
+    open_visible: true,
+    opentoplevel_join_thread: true,
+    toplevel_know_of: true,
+    toplevel_visible: true,
+    opentoplevel_know_of: true,
+    opentoplevel_visible: true,
+    child_know_of: true,
+    child_visible: true,
+    child_opentoplevel_join_thread: true,
+    child_toplevel_know_of: true,
+    child_toplevel_visible: true,
+    child_opentoplevel_know_of: true,
+    child_opentoplevel_visible: true,
+  };
+
+  it('should encode threadRolePermissionsBlob as bitmask array', () => {
+    const threadRolePermissionsBitmaskArray =
+      threadRolePermissionsBlobToBitmaskArray(permissions);
+    expect(threadRolePermissionsBitmaskArray).toEqual([
+      '0c0',
+      '0a9',
+      '090',
+      '080',
+      '005',
+      '015',
+      '0a7',
+      '030',
+      '110',
+      '0b0',
+      '040',
+      '120',
+      '060',
+      '050',
+      '000',
+      '0f0',
+      '100',
+      '0d0',
+      '010',
+      '020',
+      '001',
+      '011',
+      '0a3',
+      '002',
+      '012',
+      '003',
+      '013',
+      '008',
+      '018',
+      '0ab',
+      '00a',
+      '01a',
+      '00b',
+      '01b',
+    ]);
+  });
+});