Common Privacy Pitfalls & Mistakes

// Privacy Pitfall Detection and Remediation Tool
class PrivacyPitfallDetector {
    constructor() {
        this.pitfallCategories = {
            addressReuse: {
                severity: "CRITICAL",
                detection: "Same address used multiple times",
                impact: "Complete transaction history exposure",
                fix: "Generate new address for every transaction"
            },
            kycContamination: {
                severity: "HIGH",
                detection: "KYC and non-KYC coins mixed",
                impact: "Identity exposure through coin history",
                fix: "Keep KYC and non-KYC coins completely separate"
            },
            timingPatterns: {
                severity: "MEDIUM",
                detection: "Regular transaction timing",
                impact: "Behavioral pattern recognition",
                fix: "Randomize transaction timing"
            },
            amountPatterns: {
                severity: "MEDIUM",
                detection: "Round numbers or distinctive amounts",
                impact: "Transaction linking and identification",
                fix: "Vary amounts and avoid round numbers"
            },
            walletClustering: {
                severity: "HIGH",
                detection: "Multiple activities in single wallet",
                impact: "Activity correlation and linking",
                fix: "Use separate wallets for different purposes"
            }
        };
    }
    
    scanForPitfalls(transactionHistory, walletData) {
        const detectedIssues = [];
        const recommendations = [];
        
        // Check for address reuse
        const addressReuseIssues = this.detectAddressReuse(transactionHistory);
        if (addressReuseIssues.length > 0) {
            detectedIssues.push({
                category: "addressReuse",
                severity: "CRITICAL",
                count: addressReuseIssues.length,
                addresses: addressReuseIssues,
                description: "Address reuse detected - major privacy violation"
            });
        }
        
        // Check for timing patterns
        const timingIssues = this.detectTimingPatterns(transactionHistory);
        if (timingIssues.patternDetected) {
            detectedIssues.push({
                category: "timingPatterns",
                severity: "MEDIUM",
                description: "Regular transaction timing patterns detected",
                recommendations: ["Randomize transaction timing", "Use Tor for transaction broadcasting"]
            });
        }
        
        // Check for amount patterns
        const amountIssues = this.detectAmountPatterns(transactionHistory);
        if (amountIssues.roundNumbers > 0) {
            detectedIssues.push({
                category: "amountPatterns",
                severity: "MEDIUM",
                description: `Found ${amountIssues.roundNumbers} round number transactions`,
                recommendations: ["Avoid round numbers like 1.0, 0.5 BTC", "Add small random amounts"]
            });
        }
        
        // Check wallet clustering
        const clusteringIssues = this.detectWalletClustering(walletData);
        if (clusteringIssues.mixedActivities) {
            detectedIssues.push({
                category: "walletClustering",
                severity: "HIGH",
                description: "Multiple activity types detected in same wallet",
                activities: clusteringIssues.activities,
                recommendations: ["Separate activities into different wallets", "Use dedicated wallets for different purposes"]
            });
        }
        
        return {
            issuesFound: detectedIssues.length,
            criticalIssues: detectedIssues.filter(issue => issue.severity === "CRITICAL").length,
            issues: detectedIssues,
            overallPrivacyScore: this.calculatePrivacyScore(detectedIssues),
            immediateActions: this.getImmediateActions(detectedIssues),
            longTermImprovements: this.getLongTermImprovements(detectedIssues)
        };
    }
    
    detectAddressReuse(transactions) {
        const addressCount = {};
        const reusedAddresses = [];
        
        transactions.forEach(tx => {
            tx.outputs.forEach(output => {
                const address = output.address;
                if (addressCount[address]) {
                    addressCount[address]++;
                    if (addressCount[address] === 2) {
                        reusedAddresses.push(address);
                    }
                } else {
                    addressCount[address] = 1;
                }
            });
        });
        
        return reusedAddresses;
    }
    
    detectTimingPatterns(transactions) {
        if (transactions.length < 5) return { patternDetected: false };
        
        const intervals = [];
        for (let i = 1; i < transactions.length; i++) {
            const interval = transactions[i].timestamp - transactions[i-1].timestamp;
            intervals.push(interval);
        }
        
        // Check for regular intervals (within 10% variance)
        const avgInterval = intervals.reduce((sum, int) => sum + int, 0) / intervals.length;
        const regularIntervals = intervals.filter(int => Math.abs(int - avgInterval) < avgInterval * 0.1);
        
        return {
            patternDetected: regularIntervals.length > intervals.length * 0.6,
            averageInterval: avgInterval,
            regularIntervals: regularIntervals.length
        };
    }
    
    detectAmountPatterns(transactions) {
        const roundNumbers = transactions.filter(tx => {
            const amount = tx.amount;
            return amount % 0.1 === 0 || amount % 1 === 0; // Check for round numbers
        }).length;
        
        return { roundNumbers };
    }
    
    detectWalletClustering(walletData) {
        const activities = new Set();
        
        walletData.transactions.forEach(tx => {
            if (tx.category === "exchange") activities.add("exchange");
            if (tx.category === "merchant") activities.add("merchant");
            if (tx.category === "personal") activities.add("personal");
            if (tx.category === "mixing") activities.add("mixing");
        });
        
        return {
            mixedActivities: activities.size > 2,
            activities: Array.from(activities)
        };
    }
    
    calculatePrivacyScore(issues) {
        let score = 100;
        
        issues.forEach(issue => {
            switch (issue.severity) {
                case "CRITICAL": score -= 30; break;
                case "HIGH": score -= 20; break;
                case "MEDIUM": score -= 10; break;
                case "LOW": score -= 5; break;
            }
        });
        
        return Math.max(0, score);
    }
    
    getImmediateActions(issues) {
        const actions = [];
        
        issues.forEach(issue => {
            if (issue.category === "addressReuse") {
                actions.push("URGENT: Stop using all identified reused addresses immediately");
            }
            if (issue.category === "kycContamination") {
                actions.push("URGENT: Separate KYC and non-KYC coins completely");
            }
        });
        
        return actions;
    }
    
    getLongTermImprovements(issues) {
        return [
            "Implement automated address generation",
            "Set up separate wallets for different activities",
            "Establish privacy-conscious transaction habits",
            "Regular privacy audits (monthly)",
            "Consider mixing services for large amounts",
            "Use Tor for all Bitcoin activities"
        ];
    }
    
    generatePrivacyImprovementPlan(scanResults) {
        return {
            immediate: scanResults.immediateActions,
            thisWeek: [
                "Audit all stored addresses for reuse",
                "Set up fresh address generation",
                "Separate wallet activities"
            ],
            thisMonth: [
                "Implement privacy best practices",
                "Set up regular privacy monitoring",
                "Consider mixing for larger amounts"
            ],
            ongoing: [
                "Monthly privacy scans",
                "Stay updated on privacy tools",
                "Regular backup of privacy configurations"
            ]
        };
    }
}

// Usage example
const detector = new PrivacyPitfallDetector();
const mockTransactionHistory = [
    { amount: 0.5, timestamp: Date.now() - 86400000, outputs: [{ address: "bc1qreuse123" }] },
    { amount: 0.5, timestamp: Date.now() - 172800000, outputs: [{ address: "bc1qreuse123" }] } // Same address reused
];

const mockWalletData = {
    transactions: [
        { category: "exchange" },
        { category: "merchant" },
        { category: "personal" },
        { category: "mixing" }
    ]
};

const scanResults = detector.scanForPitfalls(mockTransactionHistory, mockWalletData);
const improvementPlan = detector.generatePrivacyImprovementPlan(scanResults);
console.log("Privacy Scan Results:", scanResults);
console.log("Improvement Plan:", improvementPlan);