diff --git a/keyserver/src/responders/thread-responders.js b/keyserver/src/responders/thread-responders.js
--- a/keyserver/src/responders/thread-responders.js
+++ b/keyserver/src/responders/thread-responders.js
@@ -3,6 +3,7 @@
 import t from 'tcomb';
 import type { TInterface, TUnion } from 'tcomb';
 
+import { rawThreadInfoValidator } from 'lib/permissions/minimally-encoded-thread-permissions-validators.js';
 import { mediaValidator } from 'lib/types/media-types.js';
 import {
   rawMessageInfoValidator,
@@ -30,7 +31,6 @@
   type RoleModificationResult,
   type RoleDeletionRequest,
   type RoleDeletionResult,
-  legacyRawThreadInfoValidator,
 } from 'lib/types/thread-types.js';
 import { serverUpdateInfoValidator } from 'lib/types/update-types.js';
 import { userInfosValidator } from 'lib/types/user-types.js';
@@ -289,7 +289,7 @@
 
 export const roleModificationResultValidator: TInterface<RoleModificationResult> =
   tShape<RoleModificationResult>({
-    threadInfo: t.maybe(legacyRawThreadInfoValidator),
+    threadInfo: t.maybe(rawThreadInfoValidator),
     updatesResult: tShape({
       newUpdates: t.list(serverUpdateInfoValidator),
     }),
@@ -310,7 +310,7 @@
 
 export const roleDeletionResultValidator: TInterface<RoleDeletionResult> =
   tShape<RoleDeletionResult>({
-    threadInfo: t.maybe(legacyRawThreadInfoValidator),
+    threadInfo: t.maybe(rawThreadInfoValidator),
     updatesResult: tShape({
       newUpdates: t.list(serverUpdateInfoValidator),
     }),
diff --git a/keyserver/src/responders/user-responders.js b/keyserver/src/responders/user-responders.js
--- a/keyserver/src/responders/user-responders.js
+++ b/keyserver/src/responders/user-responders.js
@@ -62,7 +62,6 @@
   type SubscriptionUpdateResponse,
   threadSubscriptionValidator,
 } from 'lib/types/subscription-types.js';
-import { legacyRawThreadInfoValidator } from 'lib/types/thread-types.js';
 import { createUpdatesResultValidator } from 'lib/types/update-types.js';
 import {
   type PasswordUpdate,
@@ -254,7 +253,7 @@
     rawMessageInfos: t.list(rawMessageInfoValidator),
     currentUserInfo: loggedInUserInfoValidator,
     cookieChange: tShape({
-      threadInfos: t.dict(tID, legacyRawThreadInfoValidator),
+      threadInfos: t.dict(tID, rawThreadInfoValidator),
       userInfos: t.list(userInfoValidator),
     }),
   });
diff --git a/lib/shared/updates/join-thread-spec.js b/lib/shared/updates/join-thread-spec.js
--- a/lib/shared/updates/join-thread-spec.js
+++ b/lib/shared/updates/join-thread-spec.js
@@ -5,6 +5,7 @@
 import t from 'tcomb';
 
 import type { UpdateInfoFromRawInfoParams, UpdateSpec } from './update-spec.js';
+import { rawThreadInfoValidator } from '../../permissions/minimally-encoded-thread-permissions-validators.js';
 import {
   type RawEntryInfo,
   rawEntryInfoValidator,
@@ -17,10 +18,7 @@
   messageTruncationStatusValidator,
   rawMessageInfoValidator,
 } from '../../types/message-types.js';
-import {
-  legacyRawThreadInfoValidator,
-  type RawThreadInfos,
-} from '../../types/thread-types.js';
+import { type RawThreadInfos } from '../../types/thread-types.js';
 import { updateTypes } from '../../types/update-types-enum.js';
 import type {
   ThreadJoinUpdateInfo,
@@ -171,7 +169,7 @@
     type: tNumber(updateTypes.JOIN_THREAD),
     id: t.String,
     time: t.Number,
-    threadInfo: legacyRawThreadInfoValidator,
+    threadInfo: rawThreadInfoValidator,
     rawMessageInfos: t.list(rawMessageInfoValidator),
     truncationStatus: messageTruncationStatusValidator,
     rawEntryInfos: t.list(rawEntryInfoValidator),
diff --git a/lib/shared/updates/update-thread-spec.js b/lib/shared/updates/update-thread-spec.js
--- a/lib/shared/updates/update-thread-spec.js
+++ b/lib/shared/updates/update-thread-spec.js
@@ -4,10 +4,8 @@
 import t from 'tcomb';
 
 import type { UpdateInfoFromRawInfoParams, UpdateSpec } from './update-spec.js';
-import {
-  legacyRawThreadInfoValidator,
-  type RawThreadInfos,
-} from '../../types/thread-types.js';
+import { rawThreadInfoValidator } from '../../permissions/minimally-encoded-thread-permissions-validators.js';
+import { type RawThreadInfos } from '../../types/thread-types.js';
 import { updateTypes } from '../../types/update-types-enum.js';
 import type {
   ThreadUpdateInfo,
@@ -114,6 +112,6 @@
     type: tNumber(updateTypes.UPDATE_THREAD),
     id: t.String,
     time: t.Number,
-    threadInfo: legacyRawThreadInfoValidator,
+    threadInfo: rawThreadInfoValidator,
   }),
 });
diff --git a/lib/types/request-types.js b/lib/types/request-types.js
--- a/lib/types/request-types.js
+++ b/lib/types/request-types.js
@@ -18,16 +18,14 @@
   ClientThreadInconsistencyReportShape,
   ClientEntryInconsistencyReportShape,
 } from './report-types.js';
-import {
-  legacyRawThreadInfoValidator,
-  type RawThreadInfo,
-} from './thread-types.js';
+import { type RawThreadInfo } from './thread-types.js';
 import {
   type CurrentUserInfo,
   currentUserInfoValidator,
   type AccountUserInfo,
   accountUserInfoValidator,
 } from './user-types.js';
+import { rawThreadInfoValidator } from '../permissions/minimally-encoded-thread-permissions-validators.js';
 import { tNumber, tShape, tID } from '../utils/validation-utils.js';
 
 // "Server requests" are requests for information that the server delivers to
@@ -133,7 +131,7 @@
     ),
     stateChanges: t.maybe(
       tShape<StateChanges>({
-        rawThreadInfos: t.maybe(t.list(legacyRawThreadInfoValidator)),
+        rawThreadInfos: t.maybe(t.list(rawThreadInfoValidator)),
         rawEntryInfos: t.maybe(t.list(rawEntryInfoValidator)),
         currentUserInfo: t.maybe(currentUserInfoValidator),
         userInfos: t.maybe(t.list(accountUserInfoValidator)),
diff --git a/lib/types/socket-types.js b/lib/types/socket-types.js
--- a/lib/types/socket-types.js
+++ b/lib/types/socket-types.js
@@ -33,10 +33,7 @@
   type ClientClientResponse,
 } from './request-types.js';
 import type { SessionState, SessionIdentification } from './session-types.js';
-import {
-  type RawThreadInfos,
-  legacyRawThreadInfoValidator,
-} from './thread-types.js';
+import { type RawThreadInfos } from './thread-types.js';
 import {
   type ClientUpdatesResult,
   type ClientUpdatesResultWithUserInfos,
@@ -53,6 +50,7 @@
   type LoggedOutUserInfo,
   loggedOutUserInfoValidator,
 } from './user-types.js';
+import { rawThreadInfoValidator } from '../permissions/minimally-encoded-thread-permissions-validators.js';
 import { tShape, tNumber, tID } from '../utils/validation-utils.js';
 
 // The types of messages that the client sends across the socket
@@ -193,7 +191,7 @@
 };
 const baseFullStateSyncValidator = tShape<BaseFullStateSync>({
   messagesResult: messagesResponseValidator,
-  threadInfos: t.dict(tID, legacyRawThreadInfoValidator),
+  threadInfos: t.dict(tID, rawThreadInfoValidator),
   rawEntryInfos: t.list(rawEntryInfoValidator),
   userInfos: t.list(userInfoValidator),
   updatesCurrentAsOf: t.Number,