Frontend & Domain Protection
We engineer zero-trust client-side architectures, anti-drainer transaction inspection layers, strict Content Security Policy (CSP) enforcement, and cryptographic DNS/BGP routing defenses to protect dApp interfaces and enterprise web applications from supply chain compromises and domain hijacking.
Core Capabilities
Anti-Drainer & Transaction Simulation Hooks
- ■Pre-signing simulation pipelines analyzing asset state diffs and instruction destination accounts
- ■Deterministic detection of malicious permit signatures, arbitrary CPI approvals, and blind-signing lures
- ■Client-side RPC payload encryption preventing man-in-the-middle node interception
- ■Automated wallet balance mutation alerts before transaction submission to the mempool
Strict CSP, Nonces & Subresource Integrity (SRI)
- ■Cryptographic nonce generation per request preventing unauthorized inline script and style execution
- ■Zero-tolerance Content Security Policies blocking unvetted third-party analytics and tracking pixels
- ■Automated Subresource Integrity (SRI) hash verification for all static assets and remote dependencies
- ■Sandboxed iframe isolation and strict Cross-Origin Opener/Embedder Policies (COOP/COEP)
Client-Side Supply Chain Defense
- ■Deterministic npm package lockfile audits and real-time dependency mutation monitoring
- ■Zero-runtime third-party script policies with hermetic build-time asset bundling
- ■Automated DOM mutation observers detecting unauthorized script tampering in memory
- ■Continuous WebSocket integrity monitoring between frontend clients and backend APIs
DNSSEC, BGP & Domain Hijacking Defense
- ■Full DNSSEC signing and automated registrar registry-lock enforcement against domain takeover
- ■Real-time BGP routing anomaly detection and global SSL/TLS certificate transparency log monitoring
- ■DDoS-resilient Anycast DNS failover networks with automated latency-based edge routing
- ■Strict HTTP Strict Transport Security (HSTS) with preloaded domain-level pinning
Decentralized Frontend Hosting & IPFS Redundancy
- ■Immutable IPFS and Arweave build pinning paired with Ethereum Name Service (ENS) / Solana SNS
- ■Automated CI/CD deployment pipelines producing deterministic IPFS content identifiers (CIDs)
- ■Decentralized gateway failover ensuring 100% frontend availability during centralized cloud outages
- ■Client-side cryptographic hash verification against on-chain smart contract manifest registries
Anti-Drainer & Transaction Simulation Hooks
- ■Pre-signing simulation pipelines analyzing asset state diffs and instruction destination accounts
- ■Deterministic detection of malicious permit signatures, arbitrary CPI approvals, and blind-signing lures
- ■Client-side RPC payload encryption preventing man-in-the-middle node interception
- ■Automated wallet balance mutation alerts before transaction submission to the mempool
Strict CSP, Nonces & Subresource Integrity (SRI)
- ■Cryptographic nonce generation per request preventing unauthorized inline script and style execution
- ■Zero-tolerance Content Security Policies blocking unvetted third-party analytics and tracking pixels
- ■Automated Subresource Integrity (SRI) hash verification for all static assets and remote dependencies
- ■Sandboxed iframe isolation and strict Cross-Origin Opener/Embedder Policies (COOP/COEP)
Client-Side Supply Chain Defense
- ■Deterministic npm package lockfile audits and real-time dependency mutation monitoring
- ■Zero-runtime third-party script policies with hermetic build-time asset bundling
- ■Automated DOM mutation observers detecting unauthorized script tampering in memory
- ■Continuous WebSocket integrity monitoring between frontend clients and backend APIs
DNSSEC, BGP & Domain Hijacking Defense
- ■Full DNSSEC signing and automated registrar registry-lock enforcement against domain takeover
- ■Real-time BGP routing anomaly detection and global SSL/TLS certificate transparency log monitoring
- ■DDoS-resilient Anycast DNS failover networks with automated latency-based edge routing
- ■Strict HTTP Strict Transport Security (HSTS) with preloaded domain-level pinning
Decentralized Frontend Hosting & IPFS Redundancy
- ■Immutable IPFS and Arweave build pinning paired with Ethereum Name Service (ENS) / Solana SNS
- ■Automated CI/CD deployment pipelines producing deterministic IPFS content identifiers (CIDs)
- ■Decentralized gateway failover ensuring 100% frontend availability during centralized cloud outages
- ■Client-side cryptographic hash verification against on-chain smart contract manifest registries
How It Works
Client-Side Attack Surface Analysis
We audit all third-party dependencies, build scripts, RPC endpoints, and DNS configurations to identify vulnerable injection vectors and domain takeover risks.
CSP Hardening & Nonce Enforcement
We implement strict Content Security Policies, generate cryptographic nonces, and enforce Subresource Integrity (SRI) hashes across all static assets.
Anti-Drainer & RPC Hardening
We integrate client-side transaction simulation engines and secure RPC failover pools that inspect instruction payloads and prevent malicious approvals.
DNSSEC & Infrastructure Locking
We configure DNSSEC, registry locks, BGP route monitors, and certificate transparency alerts to eliminate man-in-the-middle and DNS spoofing vectors.
Decentralized Mirroring & Verification
We deploy immutable IPFS/Arweave mirrors and connect real-time DOM integrity monitors to detect client-side script tampering in production.
Target Scenarios
High-Volume DeFi Web Applications
Securing trading terminals, liquidity pools, and lending interfaces from client-side wallet drainers, malicious RPC overrides, and rogue scripts.
Enterprise Web Portals & FinTech Dashboards
Hardening corporate client interfaces against cross-site scripting (XSS), session hijacking, and unauthorized third-party tracking scripts.
Decentralized Physical Networks (DePIN) Portals
Protecting hardware operator claim portals and telemetry visualization frontends against fake signing prompts and DNS spoofing.
NFT Marketplaces & Token Launchpads
Defending high-traffic minting pages and order books from supply chain attacks, fake approval injections, and frontend takeover during peak events.
Institutional Custody & Multi-Sig Interfaces
Ensuring governance and multi-signature approval interfaces render transaction details with cryptographic verification.
High-Volume DeFi Web Applications
Securing trading terminals, liquidity pools, and lending interfaces from client-side wallet drainers, malicious RPC overrides, and rogue scripts.
Enterprise Web Portals & FinTech Dashboards
Hardening corporate client interfaces against cross-site scripting (XSS), session hijacking, and unauthorized third-party tracking scripts.
Decentralized Physical Networks (DePIN) Portals
Protecting hardware operator claim portals and telemetry visualization frontends against fake signing prompts and DNS spoofing.
NFT Marketplaces & Token Launchpads
Defending high-traffic minting pages and order books from supply chain attacks, fake approval injections, and frontend takeover during peak events.
Institutional Custody & Multi-Sig Interfaces
Ensuring governance and multi-signature approval interfaces render transaction details with cryptographic verification.
Tech Stack
Case Studies
DeFi Exchange Frontend Hardening & Anti-Drainer Integration
Re-engineered the client-side architecture of a high-throughput decentralized exchange. Implemented strict CSP with dynamic nonces, pre-sign transaction simulation hooks, and immutable IPFS mirroring, preventing three attempted supply chain injection attacks.
Enterprise DNSSEC & BGP Routing Protection
Deployed an automated domain defense suite for an institutional crypto custodian. Configured registry locks, automated certificate transparency alerts, and real-time BGP hijacking telemetry, maintaining 99.999% secure route availability.
What Our Clients Say
"Zanvexis hardened our dApp frontend against wallet drainers and XSS vulnerabilities. Their pre-sign simulation layer gave our users full transparency and stopped malicious approvals in their tracks."
"The automated DNSSEC setup and IPFS failover deployment ensured that our exchange remained online and secure even during a major regional DNS provider outage."
Frequently Asked Questions
QHow do wallet drainers compromise Web3 frontends without altering smart contracts?
Wallet drainers typically exploit supply chain vulnerabilities in third-party npm packages, inject malicious scripts via compromised CDNs, or use DNS hijacking. These scripts intercept the user's wallet connection and present deceptive approval prompts (such as unlimited ERC-20 approvals or arbitrary permit signatures) that transfer assets to an attacker.
QWhat is Subresource Integrity (SRI) and why is it mandatory for Web3 applications?
SRI ensures that browsers only execute external scripts (from CDNs or build artifacts) if their cryptographic hash exactly matches a predetermined hash. If an attacker tampers with a hosted script or package, the browser immediately blocks execution.
QHow does pre-signing transaction simulation protect users?
Our client-side hooks simulate the transaction against an isolated node before opening the user's wallet. The system decodes all state changes, asset balance deltas, and contract approvals, displaying a clear warning if an instruction attempts to move unexpected funds or grant broad permissions.
QCan decentralized frontends on IPFS completely replace centralized hosting?
Yes. We configure automated CI/CD pipelines that compile static single-page applications, pin the immutable build to IPFS and Arweave, and route traffic via decentralized ENS/SNS domains or enterprise edge gateways for maximum redundancy.
Related Content
Eliminating Wallet Drainers with Pre-Signing State Simulation
How to decode and validate transaction instruction calldata directly in the browser before triggering wallet signatures.
Implementing Strict Nonce-Based Content Security Policies in Next.js
A practical guide to securing modern Next.js single-page applications against script injections and XSS vectors.
Defending Web3 Infrastructure Against BGP Hijacking and DNS Spoofing
Real-time route monitoring and registry lock strategies for mission-critical cryptocurrency platforms.
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SERVICE // 03Smart Contract & Full-Stack Security
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