""" Starlight Auditing System - Core Hash Lock Verification Implements trustless verification of Bitcoin script hash commitments """ import json import hashlib import base64 import datetime import re import math from typing import Dict, List, Optional, Any, Union class StarlightAuditor: """ Core auditing system for Bitcoin hash lock verification. Scans confirmed blocks and verifies PSBT commitments. """ def __init__(self): self.audit_log = [] self.verified_hashes = {} self.block_height = 0 def op_cat_restricted(self, data1: str, data2: str, confirmed: bool = False) -> Optional[str]: """ Simulate OP_CAT restricted to confirmed transactions only. Prevents DoS vulnerability from mempool operations. """ if not confirmed: return None if not data1 or not data2: return None return data1 + data2 def verify_script_hash_commitment(self, script_hash: str, psbt_data: str, ipfs_cid: str) -> Dict[str, Any]: """ Verify that PSBT matches script hash commitment. Returns verification results without exposing PSBT in clear text. """ try: psbt_hash = hashlib.sha256(psbt_data.encode()).hexdigest() expected_hash = self._extract_hash_from_script(script_hash) verification = { "timestamp": datetime.datetime.now().isoformat(), "script_hash": script_hash, "psbt_hash": psbt_hash, "ipfs_cid": ipfs_cid, "verified": expected_hash == psbt_hash, "confidence": self._calculate_confidence(script_hash, psbt_data) } if verification["verified"]: self.verified_hashes[script_hash] = verification return verification except Exception as e: return { "error": str(e), "verified": False, "timestamp": datetime.datetime.now().isoformat() } def _extract_hash_from_script(self, script_hash: str) -> str: """Extract expected hash from Bitcoin script.""" if not script_hash: return "" hash_pattern = r'[a-fA-F0-9]{64}' matches = re.findall(hash_pattern, script_hash) return matches[0] if matches else "" def _calculate_confidence(self, script_hash: str, psbt_data: str) -> float: """Calculate verification confidence score.""" base_confidence = 0.0 if script_hash and psbt_data: base_confidence += 0.4 if len(script_hash) >= 64: base_confidence += 0.3 if self._validate_script_structure(script_hash): base_confidence += 0.3 return min(base_confidence, 1.0) def _validate_script_structure(self, script: str) -> bool: """Validate Bitcoin script structure.""" required_ops = ["OP_RETURN", "OP_HASH160"] for op in required_ops: if op not in script: return False return True def scan_block_for_hash_locks(self, block_data: Dict[str, Any]) -> List[Dict[str, Any]]: """ Scan confirmed block for hash lock transactions. Identifies OP_RETURN outputs with script hash commitments. """ hash_locks = [] if not block_data.get("transactions"): return hash_locks for tx in block_data["transactions"]: for output in tx.get("outputs", []): script = output.get("script", "") if self._is_hash_lock_script(script): hash_lock = { "txid": tx.get("txid", ""), "vout": output.get("vout", 0), "script": script, "value": output.get("value", 0), "block_height": block_data.get("height", 0), "timestamp": block_data.get("timestamp", "") } hash_locks.append(hash_lock) return hash_locks def _is_hash_lock_script(self, script: str) -> bool: """Check if script contains hash lock pattern.""" hash_lock_pattern = r'OP_RETURN.*OP_HASH160.*[a-fA-F0-9]{40,64}' return bool(re.search(hash_lock_pattern, script, re.IGNORECASE)) def audit_batch_verifications(self, verifications: List[Dict[str, Any]]) -> Dict[str, Any]: """ Process batch of verifications and generate audit report. """ total = len(verifications) verified = sum(1 for v in verifications if v.get("verified", False)) failed = total - verified avg_confidence = 0.0 if total > 0: confidences = [v.get("confidence", 0) for v in verifications if "confidence" in v] avg_confidence = sum(confidences) / len(confidences) if confidences else 0 report = { "audit_timestamp": datetime.datetime.now().isoformat(), "total_verifications": total, "verified_count": verified, "failed_count": failed, "success_rate": verified / total if total > 0 else 0, "average_confidence": avg_confidence, "block_height": self.block_height, "verifications": verifications } self.audit_log.append(report) return report def generate_audit_summary(self, limit: int = 100) -> Dict[str, Any]: """Generate summary of recent audits.""" recent_audits = self.audit_log[-limit:] total_verifications = sum(a["total_verifications"] for a in recent_audits) total_verified = sum(a["verified_count"] for a in recent_audits) return { "summary_timestamp": datetime.datetime.now().isoformat(), "total_audits": len(recent_audits), "total_verifications": total_verifications, "total_verified": total_verified, "overall_success_rate": total_verified / total_verifications if total_verifications > 0 else 0, "active_hash_locks": len(self.verified_hashes), "latest_block": self.block_height } class PSBTSteganography: """ Encode PSBT data using steganography for privacy-preserving verification. """ def __init__(self): self.encoding_key = "starlight_verification_2024" def encode_psbt_in_image(self, psbt_data: str, image_data: str) -> Dict[str, Any]: """ Simulate encoding PSBT data in image using steganography. Returns encoded result and metadata. """ try: psbt_hash = hashlib.sha256(psbt_data.encode()).hexdigest() encoded_data = self._simulate_steganographic_encoding( psbt_data, image_data, self.encoding_key ) return { "success": True, "encoded_data": encoded_data, "psbt_hash": psbt_hash, "encoding_timestamp": datetime.datetime.now().isoformat(), "data_size": len(psbt_data), "encoding_method": "lsb_steganography" } except Exception as e: return { "success": False, "error": str(e), "timestamp": datetime.datetime.now().isoformat() } def decode_psbt_from_image(self, encoded_data: str) -> Dict[str, Any]: """ Decode PSBT data from steganographically encoded image. """ try: decoded_psbt = self._simulate_steganographic_decoding( encoded_data, self.encoding_key ) psbt_hash = hashlib.sha256(decoded_psbt.encode()).hexdigest() return { "success": True, "psbt_data": decoded_psbt, "psbt_hash": psbt_hash, "decoding_timestamp": datetime.datetime.now().isoformat(), "verification_ready": True } except Exception as e: return { "success": False, "error": str(e), "timestamp": datetime.datetime.now().isoformat() } def _simulate_steganographic_encoding(self, data: str, image: str, key: str) -> str: """Simulate LSB steganography encoding.""" combined = f"{data}:{key}:{len(data)}" encoded = base64.b64encode(combined.encode()).decode() return f"ENCODED:{encoded}" def _simulate_steganographic_decoding(self, encoded_data: str, key: str) -> str: """Simulate LSB steganography decoding.""" if not encoded_data.startswith("ENCODED:"): raise ValueError("Invalid encoded data format") encoded_part = encoded_data[8:] decoded = base64.b64decode(encoded_part.encode()).decode() parts = decoded.split(":") if len(parts) >= 3 and parts[1] == key: return parts[0] raise ValueError("Invalid encoding key or corrupted data") class IPFSIntegration: """ Simulate IPFS integration for off-chain script storage. """ def __init__(self): self.content_store = {} def store_script_content(self, script_data: str, metadata: Dict[str, Any] = None) -> Dict[str, Any]: """ Store script content with content addressing. Returns CID and storage confirmation. """ try: content_hash = hashlib.sha256(script_data.encode()).hexdigest() cid = self._generate_cid(content_hash) storage_entry = { "cid": cid, "content": script_data, "content_hash": content_hash, "timestamp": datetime.datetime.now().isoformat(), "metadata": metadata or {}, "size": len(script_data) } self.content_store[cid] = storage_entry return { "success": True, "cid": cid, "content_hash": content_hash, "size": len(script_data), "timestamp": storage_entry["timestamp"] } except Exception as e: return { "success": False, "error": str(e), "timestamp": datetime.datetime.now().isoformat() } def retrieve_script_content(self, cid: str) -> Dict[str, Any]: """Retrieve script content by CID.""" if cid not in self.content_store: return { "success": False, "error": "Content not found", "timestamp": datetime.datetime.now().isoformat() } entry = self.content_store[cid] return { "success": True, "cid": cid, "content": entry["content"], "content_hash": entry["content_hash"], "metadata": entry["metadata"], "timestamp": entry["timestamp"] } def _generate_cid(self, content_hash: str) -> str: """Generate CID from content hash.""" return f"bafybeig{content_hash[:32]}" def test_starlight_auditor(): """Test the Starlight auditing system.""" auditor = StarlightAuditor() test_script = "OP_RETURN OP_HASH160 a1b2c3d4e5f6789012345678901234567890abcd" test_psbt = "psbt_data_sample_transaction_details" verification = auditor.verify_script_hash_commitment(test_script, test_psbt, "test_cid") print("✅ Starlight Auditor Test:") print(f"Verification result: {verification}") return verification if __name__ == "__main__": test_starlight_auditor()