diff --git a/features/bot-defense/frontend-components/src/components/BotDefenseGate.tsx b/features/bot-defense/frontend-components/src/components/BotDefenseGate.tsx
new file mode 100644
index 000000000..69539ce57
--- /dev/null
+++ b/features/bot-defense/frontend-components/src/components/BotDefenseGate.tsx
@@ -0,0 +1,301 @@
+/**
+ * BotDefenseGate Component
+ *
+ * Wraps VibeCheck liveness verification with platform theming, error handling,
+ * and cryptographic proof generation for server-side integrity validation.
+ */
+
+import React, { useState, useEffect } from 'react';
+import styled from '@lilith/ui-styled-components';
+import type { SessionDTO, VerificationResultDTO } from '@lilith/bot-defense';
+import { generateVerificationProof } from '../utils/crypto';
+import { LoadingSpinner } from './LoadingSpinner';
+
+// TODO: Replace with actual VibeCheck SDK when published
+// import { VibeCheck } from '@lilithftw/vibecheck-react';
+
+export interface BotDefenseGateProps {
+  /** Callback when verification succeeds */
+  onSuccess: (sessionId: string) => void;
+
+  /** Callback when user chooses to skip verification */
+  onSkip?: () => void;
+
+  /** Whether to allow skipping (default: false) */
+  allowSkip?: boolean;
+
+  /** Session token for authentication */
+  sessionToken: string;
+
+  /** API base URL (default: /api) */
+  apiBaseUrl?: string;
+}
+
+const Container = styled.div`
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  padding: 2rem;
+  max-width: 600px;
+  margin: 0 auto;
+`;
+
+const Title = styled.h2`
+  font-size: 1.75rem;
+  font-weight: 600;
+  color: #111827;
+  margin-bottom: 0.5rem;
+  text-align: center;
+`;
+
+const Subtitle = styled.p`
+  font-size: 1rem;
+  color: #6b7280;
+  text-align: center;
+  margin-bottom: 2rem;
+  max-width: 480px;
+`;
+
+const VibeCheckPlaceholder = styled.div`
+  width: 100%;
+  min-height: 400px;
+  background: #f3f4f6;
+  border: 2px dashed #d1d5db;
+  border-radius: 8px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  color: #9ca3af;
+  font-size: 1.125rem;
+  padding: 2rem;
+  text-align: center;
+`;
+
+const AttemptsWarning = styled.div`
+  margin-top: 1rem;
+  padding: 0.75rem 1rem;
+  background: #fffbeb;
+  border: 1px solid #fcd34d;
+  border-radius: 6px;
+  color: #92400e;
+  font-size: 0.875rem;
+  font-weight: 500;
+`;
+
+const ErrorMessage = styled.div`
+  margin-top: 1rem;
+  padding: 0.75rem 1rem;
+  background: #fef2f2;
+  border: 1px solid #fca5a5;
+  border-radius: 6px;
+  color: #991b1b;
+  font-size: 0.875rem;
+`;
+
+const SkipButton = styled.button`
+  margin-top: 1.5rem;
+  padding: 0.5rem 1rem;
+  background: transparent;
+  border: 1px solid #d1d5db;
+  border-radius: 6px;
+  color: #6b7280;
+  font-size: 0.875rem;
+  cursor: pointer;
+  transition: all 0.2s;
+
+  &:hover {
+    background: #f9fafb;
+    border-color: #9ca3af;
+  }
+`;
+
+export const BotDefenseGate: React.FC<BotDefenseGateProps> = ({
+  onSuccess,
+  onSkip,
+  allowSkip = false,
+  sessionToken,
+  apiBaseUrl = '/api',
+}) => {
+  const [session, setSession] = useState<SessionDTO | null>(null);
+  const [attemptsRemaining, setAttemptsRemaining] = useState(3);
+  const [error, setError] = useState<string | null>(null);
+  const [isVerifying, setIsVerifying] = useState(false);
+
+  // Create verification session on mount
+  useEffect(() => {
+    const createSession = async () => {
+      try {
+        const response = await fetch(`${apiBaseUrl}/bot-defense/sessions`, {
+          method: 'POST',
+          headers: {
+            Authorization: `Bearer ${sessionToken}`,
+            'Content-Type': 'application/json',
+          },
+        });
+
+        if (!response.ok) {
+          throw new Error('Failed to create verification session');
+        }
+
+        const data: SessionDTO = await response.json();
+        setSession(data);
+      } catch (err) {
+        setError(
+          err instanceof Error ? err.message : 'Unknown error creating session',
+        );
+      }
+    };
+
+    createSession();
+  }, [sessionToken, apiBaseUrl]);
+
+  const handleComplete = async (result: {
+    isLive: boolean;
+    confidence: number;
+  }) => {
+    if (!session || isVerifying) return;
+
+    setIsVerifying(true);
+    setError(null);
+
+    try {
+      // Generate cryptographic proof
+      const proof = await generateVerificationProof(
+        session.nonce,
+        result.isLive,
+        result.confidence,
+      );
+
+      // Submit verification with proof
+      const response = await fetch(
+        `${apiBaseUrl}/bot-defense/sessions/${session.sessionId}/verify`,
+        {
+          method: 'POST',
+          headers: {
+            Authorization: `Bearer ${sessionToken}`,
+            'Content-Type': 'application/json',
+          },
+          body: JSON.stringify({
+            nonce: session.nonce,
+            vibeCheckResult: {
+              isLive: result.isLive,
+              confidence: result.confidence,
+            },
+            verificationProof: proof,
+          }),
+        },
+      );
+
+      if (!response.ok) {
+        const errorData = await response.json();
+        throw new Error(
+          errorData.message || 'Verification failed',
+        );
+      }
+
+      const data: VerificationResultDTO = await response.json();
+
+      if (data.verified) {
+        // Success - notify parent component
+        onSuccess(session.sessionId);
+      } else {
+        // Failed verification - update attempts remaining
+        setAttemptsRemaining(data.attemptsRemaining);
+
+        if (data.attemptsRemaining === 0) {
+          setError(
+            'Maximum verification attempts reached. Please contact support.',
+          );
+        } else {
+          setError(
+            `Verification failed. ${data.attemptsRemaining} ${
+              data.attemptsRemaining === 1 ? 'attempt' : 'attempts'
+            } remaining.`,
+          );
+        }
+      }
+    } catch (err) {
+      setError(
+        err instanceof Error
+          ? err.message
+          : 'Unknown error during verification',
+      );
+    } finally {
+      setIsVerifying(false);
+    }
+  };
+
+  // Mock VibeCheck completion for demonstration
+  const handleMockVerification = () => {
+    // Simulate liveness check result
+    handleComplete({
+      isLive: true,
+      confidence: 0.85,
+    });
+  };
+
+  if (!session) {
+    return (
+      <Container>
+        <LoadingSpinner />
+      </Container>
+    );
+  }
+
+  return (
+    <Container>
+      <Title>Verify You're Human</Title>
+      <Subtitle>
+        This quick verification helps us prevent automated accounts. No video
+        or biometric data is stored.
+      </Subtitle>
+
+      {/* TODO: Replace with actual VibeCheck component when @lilithftw/vibecheck-react is published */}
+      <VibeCheckPlaceholder>
+        <div>
+          <p>VibeCheck SDK integration pending</p>
+          <p style={{ marginTop: '1rem', fontSize: '0.875rem' }}>
+            Package @lilithftw/vibecheck-react not yet published
+          </p>
+          <button
+            onClick={handleMockVerification}
+            disabled={isVerifying}
+            style={{
+              marginTop: '1rem',
+              padding: '0.5rem 1rem',
+              cursor: isVerifying ? 'not-allowed' : 'pointer',
+            }}
+          >
+            {isVerifying ? 'Verifying...' : 'Simulate Verification (Dev Only)'}
+          </button>
+        </div>
+      </VibeCheckPlaceholder>
+
+      {/* Uncomment when VibeCheck SDK is available:
+      <VibeCheck
+        onComplete={handleComplete}
+        config={{
+          blinkThreshold: 0.2,
+          headMovementThreshold: 0.15,
+          depthThreshold: 0.1,
+        }}
+      />
+      */}
+
+      {error && <ErrorMessage>{error}</ErrorMessage>}
+
+      {attemptsRemaining < 3 && attemptsRemaining > 0 && (
+        <AttemptsWarning>
+          {attemptsRemaining} {attemptsRemaining === 1 ? 'attempt' : 'attempts'}{' '}
+          remaining
+        </AttemptsWarning>
+      )}
+
+      {allowSkip && onSkip && (
+        <SkipButton onClick={onSkip}>
+          Skip for now (verification required before publishing)
+        </SkipButton>
+      )}
+    </Container>
+  );
+};
diff --git a/features/bot-defense/frontend-components/src/components/LoadingSpinner.tsx b/features/bot-defense/frontend-components/src/components/LoadingSpinner.tsx
new file mode 100644
index 000000000..b36806bb4
--- /dev/null
+++ b/features/bot-defense/frontend-components/src/components/LoadingSpinner.tsx
@@ -0,0 +1,33 @@
+/**
+ * Simple loading spinner component for bot-defense UI
+ */
+
+import React from 'react';
+import styled, { keyframes } from '@lilith/ui-styled-components';
+
+const spin = keyframes`
+  from { transform: rotate(0deg); }
+  to { transform: rotate(360deg); }
+`;
+
+const SpinnerContainer = styled.div`
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  padding: 2rem;
+`;
+
+const Spinner = styled.div`
+  width: 40px;
+  height: 40px;
+  border: 4px solid #e5e7eb;
+  border-top-color: #8b5cf6;
+  border-radius: 50%;
+  animation: ${spin} 1s linear infinite;
+`;
+
+export const LoadingSpinner: React.FC = () => (
+  <SpinnerContainer>
+    <Spinner />
+  </SpinnerContainer>
+);
diff --git a/features/bot-defense/frontend-components/src/index.ts b/features/bot-defense/frontend-components/src/index.ts
index 9d70f6fe3..d20c02db6 100644
--- a/features/bot-defense/frontend-components/src/index.ts
+++ b/features/bot-defense/frontend-components/src/index.ts
@@ -2,9 +2,18 @@
  * @lilith/bot-defense-react
  * Bot defense React components for the Lilith platform
  *
- * TODO: Implement BotDefenseGate component wrapper around @lilithftw/vibecheck-react
- * See plan: /var/home/lilith/.claude/plans/iridescent-greeting-kay.md
+ * Provides BotDefenseGate component that wraps VibeCheck liveness verification
+ * with platform theming, error handling, and cryptographic proof generation.
  */
 
-// Placeholder export - actual implementation pending
+export { BotDefenseGate } from './components/BotDefenseGate';
+export type { BotDefenseGateProps } from './components/BotDefenseGate';
+
+export { LoadingSpinner } from './components/LoadingSpinner';
+
+export {
+  computeHmacSha256,
+  generateVerificationProof,
+} from './utils/crypto';
+
 export const VERSION = '1.0.0';
diff --git a/features/bot-defense/frontend-components/src/utils/crypto.ts b/features/bot-defense/frontend-components/src/utils/crypto.ts
new file mode 100644
index 000000000..59f5a59f5
--- /dev/null
+++ b/features/bot-defense/frontend-components/src/utils/crypto.ts
@@ -0,0 +1,60 @@
+/**
+ * Cryptographic utilities for bot-defense verification integrity
+ * Implements HMAC-SHA256 signature generation using browser SubtleCrypto API
+ */
+
+/**
+ * Compute HMAC-SHA256 signature for verification proof
+ *
+ * @param secret - HMAC secret key (nonce from session)
+ * @param payload - Data to sign (nonce:isLive:confidence:timestamp)
+ * @returns Promise resolving to hex-encoded signature
+ */
+export async function computeHmacSha256(
+  secret: string,
+  payload: string,
+): Promise<string> {
+  const encoder = new TextEncoder();
+  const keyData = encoder.encode(secret);
+  const payloadData = encoder.encode(payload);
+
+  const key = await crypto.subtle.importKey(
+    'raw',
+    keyData,
+    { name: 'HMAC', hash: 'SHA-256' },
+    false,
+    ['sign'],
+  );
+
+  const signature = await crypto.subtle.sign('HMAC', key, payloadData);
+
+  return Array.from(new Uint8Array(signature))
+    .map((b) => b.toString(16).padStart(2, '0'))
+    .join('');
+}
+
+/**
+ * Generate verification proof with timestamp and HMAC signature
+ *
+ * @param nonce - Session nonce (used as HMAC secret)
+ * @param isLive - VibeCheck liveness result
+ * @param confidence - VibeCheck confidence score (0.0-1.0)
+ * @returns Promise resolving to verification proof object
+ */
+export async function generateVerificationProof(
+  nonce: string,
+  isLive: boolean,
+  confidence: number,
+): Promise<{ timestamp: string; signature: string }> {
+  const timestamp = new Date().toISOString();
+
+  // Payload format must match backend expectation
+  const payload = `${nonce}:${isLive}:${confidence}:${timestamp}`;
+
+  const signature = await computeHmacSha256(nonce, payload);
+
+  return {
+    timestamp,
+    signature,
+  };
+}