diff --git a/lib/Redis.ts b/lib/Redis.ts
index d36cc2e..648b850 100644
--- a/lib/Redis.ts
+++ b/lib/Redis.ts
@@ -11,6 +11,9 @@ import { LabelledKey } from './Key';
 
 const logger = debug ('redis');
 
+export type SyncClass = 'blacklist' | 'keystore'
+export type SyncValue = LabelledKey | string;
+
 export class Redis {
   private _redis: IORedis | null = null;
 
@@ -52,20 +55,31 @@ export class Redis {
     log ('done');
   }
 
-  public async set_key (key: LabelledKey): Promise<void> {
-    const log = logger.extend ('set_key');
-    log ('trying to set key %s to redis', key.index);
+  public async set (
+    sync_class: SyncClass,
+    key: string,
+    value: SyncValue
+  ): Promise<void> {
+    const log = logger.extend ('set');
+    log ('trying to set %s value %s to redis', sync_class, key);
     if (this._redis === null) {
       log ('redis is inactive, skipping');
       return;
     }
-    const valid_for = Math.floor (
-      (key.valid_until - (new Date)
-        .getTime ()) / 1000
-    );
-    log ('key is valid for %d seconds', valid_for);
-    await this._redis.setex (key.index, valid_for, JSON.stringify (key));
-    log ('saved key');
+    let valid_for = null;
+    if (sync_class === 'keystore') {
+      valid_for = Math.floor (
+        (key.valid_until - (new Date)
+          .getTime ()) / 1000
+      );
+      log ('key is valid for %d seconds', valid_for);
+    }
+    if (valid_for === null)
+      await this._redis.set (key, JSON.stringify (value));
+    else
+      await this._redis.setex (key, valid_for, JSON.stringify (value));
+
+    log ('saved value');
   }
 
   public async get_key (index: string): Promise<LabelledKey | null> {