feat: single-asset auth, UI improvements

- Auth flow now uses single signature from user's chosen coin
- Update SmirkSignResult types to match extension API
- Add Creepster font for branding
- Better error messages from API responses
- Update docs to reflect single-asset auth is working

.gitignore

@@ -32,6 +32,7 @@ yarn-error.log*
 
 # env files (can opt-in for committing if needed)
 .env*
+!.env.local.example
 
 # vercel
 .vercel

README.md

@@ -52,14 +52,12 @@ The Smirk extension injects a `window.smirk` API object into web pages. The webs
 5. Website calls `POST /api/v1/auth/website/challenge` with origin
 6. Backend returns challenge message (with nonce + timestamp + origin)
 7. Website calls `window.smirk.signMessage(challenge)`
-8. Extension shows signing popup with the message
-9. User approves → Extension returns signatures from all 5 keys
-10. Website sends `{ challenge_id, signatures }` to `POST /api/v1/auth/website/verify`
-11. Backend verifies signatures, looks up user by BTC pubkey_hash, issues JWT session
+8. Extension shows asset picker - user chooses favorite coin
+9. User signs → Extension returns signature from chosen asset
+10. Website sends `{ challenge_id, signature }` to `POST /api/v1/auth/website/verify`
+11. Backend verifies signature, looks up user by pubkey_hash, issues JWT session
 12. Website stores JWT, user is now authenticated
 
-**Future**: Allow single-asset auth (user picks their favorite coin to sign with).
-
 ### Tech Stack
 
 - **Framework**: Next.js 14+ (App Router)

TODO.md

@@ -134,14 +134,11 @@ Origin: https://smirk.cash
 
 Challenge should expire after ~5 minutes to prevent replay attacks.
 
-### Single-Asset Authentication (Future Enhancement)
+### Single-Asset Authentication (DONE - 2026-01-25)
 
-**Current implementation**: Backend requires signatures from all 5 asset keys.
+User picks their favorite coin to sign with:
+- Simpler UX - choose one coin, sign once
+- User data - "What's your favorite coin?" insight
+- Any of the 5 coins proves wallet ownership
 
-**Better approach**: Let users pick their favorite coin to sign with. Benefits:
-1. **Simpler UX** - User chooses one coin, signs once
-2. **User data** - "What's your favorite coin?" gives us insight into our user base
-3. **Proof of concept** - Demonstrates wallet-based auth for ANY of these 5 coins
-4. **Still secure** - We already know all 5 pubkeys; signing with ANY one proves wallet ownership
-
-This positions Smirk as infrastructure for wallet-based authentication across multiple cryptocurrencies. Other websites could use the same pattern - "Sign in with Bitcoin/Litecoin/Monero/Wownero/Grin".
+This positions Smirk as infrastructure for wallet-based authentication across multiple cryptocurrencies.

src/app/globals.css

@@ -1,5 +1,13 @@
 @import "tailwindcss";
 
+@font-face {
+  font-family: 'Creepster';
+  src: url('/fonts/Creepster-Regular.ttf') format('truetype');
+  font-weight: normal;
+  font-style: normal;
+  font-display: swap;
+}
+
 :root {
   --background: #0a0a0a;
   --foreground: #ededed;
@@ -73,3 +81,13 @@ body {
   font-weight: 500;
   text-transform: uppercase;
 }
+
+/* Creepster text styling */
+.creepster-text {
+  font-family: 'Creepster', cursive;
+  color: #fbeb0a;
+  text-shadow:
+    0 0 10px rgba(251, 235, 10, 0.6),
+    0 0 20px rgba(251, 235, 10, 0.4),
+    0 0 30px rgba(251, 235, 10, 0.2);
+}

src/app/page.tsx

@@ -60,14 +60,17 @@ export default function Home() {
       const challenge = await getChallenge(window.location.origin);
 
       // Sign with the selected coin
-      const signatures = await window.smirk.signMessage(challenge.challenge);
-      const sig = signatures[coin];
+      const result = await window.smirk.signMessage(challenge.challenge);
+      const sig = result.signatures.find((s) => s.asset === coin);
+      if (!sig) {
+        throw new Error(`No signature found for ${coin}`);
+      }
 
       // Verify with backend
       const auth = await verifySignature(challenge.challenge_id, {
         asset: coin,
         signature: sig.signature,
-        public_key: sig.public_key,
+        public_key: sig.publicKey,
       });
 
       // Store token and show logged in
@@ -101,15 +104,19 @@ export default function Home() {
   return (
     <div className="min-h-screen flex flex-col items-center justify-center p-8">
       {/* Logo */}
-      <div className="mb-12 logo-glow">
+      <div className="mb-12 flex flex-col items-center">
+        <h1 className="creepster-text text-4xl mb-4">SMIRK WALLET</h1>
+        <div className="logo-glow">
           <Image
-          src="/logo_w_creepytext.svg"
-          alt="Smirk Wallet"
-          width={220}
-          height={200}
+            src="/logo.svg"
+            alt="Smirk"
+            width={160}
+            height={160}
             priority
           />
         </div>
+        <p className="creepster-text text-2xl mt-4">smirk.ca$h</p>
+      </div>
 
       {/* Initial state - Connect button */}
       {step === 'initial' && (

src/lib/api.ts

@@ -34,8 +34,8 @@ export async function getChallenge(origin: string): Promise<ChallengeResponse> {
   });
 
   if (!res.ok) {
-    const error = await res.json().catch(() => ({ message: 'Request failed' }));
-    throw new Error(error.message || 'Failed to get challenge');
+    const data = await res.json().catch(() => ({}));
+    throw new Error(data.error || data.message || 'Failed to get challenge');
   }
 
   return res.json();
@@ -55,8 +55,8 @@ export async function verifySignature(
   });
 
   if (!res.ok) {
-    const error = await res.json().catch(() => ({ message: 'Request failed' }));
-    throw new Error(error.message || 'Failed to verify signature');
+    const data = await res.json().catch(() => ({}));
+    throw new Error(data.error || data.message || 'Failed to verify signature');
   }
 
   return res.json();

src/types/smirk.d.ts

@@ -9,25 +9,23 @@ interface SmirkPublicKeys {
 }
 
 interface SmirkSignature {
-  asset: string;
+  asset: 'btc' | 'ltc' | 'xmr' | 'wow' | 'grin';
   signature: string;
-  public_key: string;
+  publicKey: string;
 }
 
-interface SmirkSignatures {
-  btc: SmirkSignature;
-  ltc: SmirkSignature;
-  xmr: SmirkSignature;
-  wow: SmirkSignature;
-  grin: SmirkSignature;
+interface SmirkSignResult {
+  message: string;
+  signatures: SmirkSignature[];
 }
 
 interface SmirkAPI {
+  isSmirk: boolean;
   connect(): Promise<SmirkPublicKeys>;
   disconnect(): Promise<void>;
   isConnected(): Promise<boolean>;
   getPublicKeys(): Promise<SmirkPublicKeys | null>;
-  signMessage(message: string): Promise<SmirkSignatures>;
+  signMessage(message: string): Promise<SmirkSignResult>;
 }
 
 interface Window {