diff --git a/src/app/jams/oauth/code/route.ts b/src/app/jams/oauth/code/route.ts
index 66f056d..3ffcf8e 100644
--- a/src/app/jams/oauth/code/route.ts
+++ b/src/app/jams/oauth/code/route.ts
@@ -39,19 +39,39 @@ export async function GET(request: NextRequest) {
   // Test for user existence
   let tUserExists = await mauth.verifyUser(tUserToken.token_type + " " + tUserToken.access_token);
 
-  console.log(tUserExists,);
+  console.log(tUserExists);
 
   if (tUserExists == null) return new Response('', {
     status: 400
   });
 
+  // Check if user is "dangerous"
+
+  const t1ListRequest = await fetch("https://seirdy.one/pb/tier1.csv");
+  
+  const t1List = await t1ListRequest.text();
+
+  if (t1List == null) return new Response('', {
+    status: 500
+  });
+
+  // Split lists
+
+  const JSONt1List = t1List.split("\n").slice(2).map(x => x.split(",")[0]);
+
+  // Impersonation check
+
+  if (!tUserExists.url.includes(instance) && !tUserExists.url.includes(tUserExists.acct)) return new Response(`URL is invalid`, {
+    status: 401
+  });
+
   let currentUser = {
     id: nanoid(21),
     instance,
     username: tUserExists.acct,
     admin: false,
     url: tUserExists.url,
-    banned: false,
+    banned: JSONt1List.includes(instance), // If user's domain is on tier1, start user banned
     joined: Date.now()
   } as UserTable;
 
diff --git a/src/app/jams/oauth/login/route.ts b/src/app/jams/oauth/login/route.ts
index 404abee..b601b5c 100644
--- a/src/app/jams/oauth/login/route.ts
+++ b/src/app/jams/oauth/login/route.ts
@@ -11,6 +11,37 @@ export async function GET(request: NextRequest) {
   });
   const mauth = new MastoAuth(instance);
 
+  // Check if instance is fediblocked
+
+  const fnListRequest = await fetch("https://seirdy.one/pb/FediNuke.txt");
+  
+  const fnList = await fnListRequest.text();
+
+  if (fnList == null) return new Response('', {
+    status: 500
+  });
+
+  const ssListRequest = await fetch("https://seirdy.one/pb/spammy-subdomains.txt");
+  
+  const ssList = await ssListRequest.text();
+
+  if (ssList == null) return new Response('', {
+    status: 500
+  });
+
+  // Split lists
+
+  const JSONFnList = fnList.split("\n");
+  const JSONSsList = ssList.split("\n");
+
+  if (JSONSsList.includes(instance)) return new Response('https://seirdy.one/pb/spammy-subdomains.txt', {
+    status: 403
+  });
+
+  if (JSONFnList.includes(instance)) return new Response('https://seirdy.one/pb/FediNuke.txt', {
+    status: 403
+  });
+
   // Check if instance app exists
   let existingInstanceApp = await db
       .selectFrom('apps')
@@ -41,7 +72,7 @@ export async function GET(request: NextRequest) {
         .returningAll()
         .executeTakeFirstOrThrow();
     } catch (err) {
-      return  new Response('', {
+      return new Response('', {
         status: 500
       });
     }