Integrate real BSV blockchain attestation

- Add SimpleBSV API integration for on-chain attestation
- Results are published to BSV mainnet with txid
- Include WhatsOnChain verification link
- No trade secrets exposed - only result summaries
- Fallback to offline mode if API unavailable

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app.py

@@ -15,9 +15,55 @@ import gradio as gr
 import hashlib
 import random
 import time
+import httpx
+import json
+import os
 from datetime import datetime
 from typing import Optional, Dict, List, Tuple
 
+# =============================================================================
+# BSV Blockchain Configuration
+# =============================================================================
+
+BSV_API_URL = "https://simplebsv.codenlighten.org"
+BSV_API_KEY = os.getenv("BSV_API_KEY", "REDACTED_BSV_KEY")
+
+
+def publish_to_bsv(data: Dict) -> Optional[str]:
+    """
+    Publish attestation data to BSV blockchain via SimpleBSV API.
+
+    Args:
+        data: Dictionary containing attestation data (no trade secrets)
+
+    Returns:
+        Transaction ID if successful, None otherwise
+    """
+    try:
+        headers = {
+            "Content-Type": "application/json",
+            "x-api-key": BSV_API_KEY
+        }
+
+        # Use ?wait=true for synchronous response with txid
+        response = httpx.post(
+            f"{BSV_API_URL}/publish/json?wait=true",
+            headers=headers,
+            json={"data": data},
+            timeout=30.0
+        )
+
+        if response.status_code == 200:
+            result = response.json()
+            return result.get("txid")
+        else:
+            print(f"BSV API error: {response.status_code} - {response.text}")
+            return None
+
+    except Exception as e:
+        print(f"BSV publish error: {e}")
+        return None
+
 # =============================================================================
 # Demo Configuration - Pre-computed results (no trade secrets exposed)
 # =============================================================================
@@ -351,12 +397,45 @@ def create_confidence_bars(evidence_codes: List[str], confidence: float) -> str:
 
 
 def generate_bsv_attestation(variant_id: str, classification: str, confidence: float) -> str:
-    """Generate BSV blockchain attestation."""
+    """Generate and publish BSV blockchain attestation."""
     timestamp = datetime.now().strftime("%Y-%m-%d %H:%M:%S UTC")
 
-    # Create deterministic hash
-    data_str = f"{variant_id}|{classification}|{confidence}|{timestamp}"
+    # Create attestation data (no trade secrets - only results summary)
+    attestation_data = {
+        "platform": "TopoGrammar",
+        "version": "v2.1.0",
+        "timestamp": timestamp,
+        "analysis_type": "VUS_Resolution",
+        "variant_id": variant_id,
+        "classification": classification,
+        "confidence": round(confidence, 2),
+        "attestation_type": "demo"
+    }
+
+    # Create hash of the attestation data
+    data_str = json.dumps(attestation_data, sort_keys=True)
     query_hash = hashlib.sha256(data_str.encode()).hexdigest()[:16]
+    full_hash = hashlib.sha256(data_str.encode()).hexdigest()
+
+    # Publish to BSV blockchain
+    txid = publish_to_bsv(attestation_data)
+
+    if txid:
+        # Real blockchain attestation
+        whatsonchain_url = f"https://whatsonchain.com/tx/{txid}"
+        status_line = f"Status: ✓ RECORDED ON BSV MAINNET"
+        txid_display = txid[:20] + "..." if len(txid) > 20 else txid
+        verify_section = f"""║  Transaction ID: {txid_display}
+║                                                              ║
+║  🔗 Verify on WhatsOnChain:                                  ║
+║  {whatsonchain_url[:54]}"""
+    else:
+        # Fallback if API fails
+        status_line = "Status: ⚠ OFFLINE MODE (BSV API unavailable)"
+        verify_section = f"""║  Data Hash:      {full_hash[:32]}...
+║                                                              ║
+║  ℹ Blockchain recording temporarily unavailable.             ║
+║  Result hash preserved for later attestation."""
 
     return f"""
 ```
@@ -376,12 +455,13 @@ def generate_bsv_attestation(variant_id: str, classification: str, confidence: f
 ║                                                              ║
 ║  ─────────────────────────────────────────────────────────  ║
 ║                                                              ║
-║  Status: ✓ DEMO ATTESTATION                                 ║
-║  Network: BSV Testnet                                        ║
+║  {status_line}
+║  Network: BSV Mainnet                                        ║
+║                                                              ║
+{verify_section}
 ║                                                              ║
-║  This certificate demonstrates TopoGrammar's blockchain     ║
-║  verification capability. Production attestations are       ║
-║  recorded on BSV mainnet.                                    ║
+║  This attestation is immutably recorded on BSV blockchain.  ║
+║  No proprietary algorithms or trade secrets are published.  ║
 ║                                                              ║
 ╚══════════════════════════════════════════════════════════════╝
 ```

requirements.txt

@@ -1 +1,2 @@
 gradio>=4.0.0
+httpx>=0.25.0