diff --git a/server/src/routes/auth-edge.test.ts b/server/src/routes/auth-edge.test.ts
new file mode 100644
index 0000000..b95a277
--- /dev/null
+++ b/server/src/routes/auth-edge.test.ts
@@ -0,0 +1,137 @@
+import { describe, it, expect, vi, afterEach } from 'vitest'
+import { Hono } from 'hono'
+import { authRouter } from './auth.js'
+import { generateSecretKey, getPublicKey, finalizeEvent } from 'nostr-tools'
+import { createJwt, extractPubkeyFromAuth } from '../middleware/jwt.js'
+
+const app = new Hono()
+app.route('/api/auth', authRouter)
+
+function makeNip98Header(sk: Uint8Array, url: string, method: string) {
+  const event = finalizeEvent({
+    kind: 27235,
+    created_at: Math.floor(Date.now() / 1000),
+    tags: [['u', url], ['method', method]],
+    content: '',
+  }, sk)
+  return `Nostr ${Buffer.from(JSON.stringify(event)).toString('base64')}`
+}
+
+function uniqueName() {
+  return `t${Date.now().toString(36).slice(-5)}${Math.random().toString(36).slice(2, 4)}`
+}
+
+describe('auth edge cases — 7.2', () => {
+  // --- concurrent same-name registration ---
+  it('concurrent same-name registration: exactly one succeeds, other fails', async () => {
+    const name = uniqueName()
+    const pk1 = getPublicKey(generateSecretKey())
+    const pk2 = getPublicKey(generateSecretKey())
+
+    const [res1, res2] = await Promise.all([
+      app.request('/api/auth/register', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ pubkey: pk1, name }),
+      }),
+      app.request('/api/auth/register', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ pubkey: pk2, name }),
+      }),
+    ])
+
+    // Exactly one should succeed (201)
+    // The loser hits either the name check (409) or the DB UNIQUE constraint (500)
+    // depending on timing — both are acceptable as long as only one bot is created
+    const successCount = [res1.status, res2.status].filter(s => s === 201).length
+    expect(successCount).toBe(1)
+    // The failure status should be 4xx or 5xx
+    const failStatus = [res1.status, res2.status].find(s => s !== 201)!
+    expect(failStatus).toBeGreaterThanOrEqual(400)
+  })
+
+  it('case-insensitive name collision: "MyBot" blocks "mybot"', async () => {
+    const name = uniqueName()
+    const pk1 = getPublicKey(generateSecretKey())
+    const pk2 = getPublicKey(generateSecretKey())
+
+    // First registration
+    const res1 = await app.request('/api/auth/register', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ pubkey: pk1, name: name.toUpperCase() }),
+    })
+    expect(res1.status).toBe(201)
+
+    // Second with same name different case
+    const res2 = await app.request('/api/auth/register', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ pubkey: pk2, name: name.toLowerCase() }),
+    })
+    expect(res2.status).toBe(409)
+    const body = await res2.json() as { error: string }
+    expect(body.error).toContain('already exists')
+  })
+
+  // --- expired JWT at route level ---
+  it('expired JWT: extractPubkeyFromAuth returns null for expired token', () => {
+    vi.useFakeTimers()
+    const token = createJwt('a'.repeat(64), 'bot-1')
+
+    // Advance past 24h expiry
+    vi.advanceTimersByTime(25 * 60 * 60 * 1000)
+
+    const pubkey = extractPubkeyFromAuth(`Bearer ${token}`)
+    expect(pubkey).toBeNull()
+  })
+
+  it('NIP-98 with different key than claimed: signature rejected', async () => {
+    const sk1 = generateSecretKey()
+    const sk2 = generateSecretKey()
+
+    // Sign with sk1 but claim sk2's pubkey by tampering
+    const event = finalizeEvent({
+      kind: 27235,
+      created_at: Math.floor(Date.now() / 1000),
+      tags: [['u', 'https://localhost/api/auth/nostr/session'], ['method', 'POST']],
+      content: '',
+    }, sk1)
+
+    // Tamper: replace pubkey with sk2's pubkey (simulates NIP-07 returning wrong key)
+    const tampered = { ...event, pubkey: getPublicKey(sk2) }
+    const header = `Nostr ${Buffer.from(JSON.stringify(tampered)).toString('base64')}`
+
+    const res = await app.request('/api/auth/nostr/session', {
+      method: 'POST',
+      headers: { Authorization: header },
+    })
+    expect(res.status).toBe(401)
+  })
+
+  // --- duplicate pubkey registration ---
+  it('same pubkey cannot register twice', async () => {
+    const pk = getPublicKey(generateSecretKey())
+
+    const res1 = await app.request('/api/auth/register', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ pubkey: pk, name: uniqueName() }),
+    })
+    expect(res1.status).toBe(201)
+
+    const res2 = await app.request('/api/auth/register', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ pubkey: pk, name: uniqueName() }),
+    })
+    expect(res2.status).toBe(409)
+    const body = await res2.json() as { error: string }
+    expect(body.error).toContain('already has a bot')
+  })
+
+  afterEach(() => {
+    vi.useRealTimers()
+  })
+})