Web3 &
Blockchain Security
Smart contracts, NFT platforms, and token-gated systems built with blockchain-native threat models — formal verification, institutional key management, and DeFi economic exploit modelling before a single dollar of TVL is at risk.
The institutional standard for blockchain security and development
Security-Native Architecture
Every smart contract, wallet integration, and protocol we build is threat-modelled from day one. Security is not an afterthought — it is the architecture. Our developers are also auditors, which means adversarial thinking is embedded in every design decision before a single line of Solidity or Rust is written.
Formal Verification Capability
Beyond standard testing — we apply mathematical formal verification to critical contract logic using Certora Prover and SMTChecker, providing proof-level assurance that your contract behaves exactly as specified under all possible inputs. This is the highest standard of assurance available in blockchain engineering.
Multi-Chain Engineering
Native expertise across Ethereum (Solidity/EVM), Solana (Rust/Anchor), Polygon, Avalanche, and BNB Chain — plus Layer 2 deployments on Arbitrum, Optimism, and Base. One team, every production chain, without the handoff risk of engaging multiple specialist contractors.
Enterprise-Grade Delivery
ISO 27001-aligned development processes, documented audit trails, full source control, and legal-grade technical documentation — ready for institutional, regulatory, and investor scrutiny. Every engagement produces artefacts that satisfy enterprise procurement, VC due diligence, and regulatory examination requirements.
Seven Specialised Web3 Security & Development Capabilities
From smart contract architecture to blockchain forensics — one integrated Web3 security and development practice.
NFT-Based Chat System Development
Token-gated messaging platforms where on-chain ownership is the identity — built for exclusive communities, DAOs, and Web3-native brands. ERC-721/1155 and SPL token gate logic, end-to-end encrypted DMs, multi-wallet support, and automatic access revocation within seconds of NFT transfer. Push Protocol and XMTP integration for decentralised wallet-to-wallet messaging.
Smart Contract Development & Audit
Full-lifecycle Solidity and Rust smart contract development with formal verification using Certora Prover and SMTChecker — mathematical proof that contract logic is correct under all possible states. Reentrancy analysis, access control audit, gas optimisation, upgradeability patterns, and CVSS-scored investor-grade audit reports accepted by leading launchpads and VCs.
NFT Platform Development
Full-stack NFT marketplace and minting platform with ERC-2981 royalty enforcement, IPFS and Arweave decentralised storage, lazy minting architecture, and merkle-proof whitelist systems. Anti-wash-trading detection, multi-currency settlement, and full administrative dashboards — built to the same standard we apply to DeFi protocols.
DeFi Protocol Security
Comprehensive DeFi security review covering flash loan simulation, oracle manipulation testing, economic exploit modelling using agent-based simulation, and AMM invariant verification. Governance attack surface review, cross-protocol composability risk analysis, and adversarial red team on forked mainnet — before a single dollar of TVL is at risk.
Wallet & Key Management Security
Institutional-grade wallet integration, Gnosis Safe multi-sig architecture, HSM integration, and MPC wallet implementation for keyless signing without single custodian risk. Private key exposure audit, seed phrase security architecture, key rotation procedures, and break-glass access protocols — eliminating the single greatest attack surface in Web3.
Blockchain Forensics
On-chain transaction graph analysis, wallet attribution and clustering, rug pull investigation, and smart contract exploit post-mortems for legal, regulatory, and recovery contexts. Exchange and mixer tracing, legal-grade evidence packaging for civil litigation and regulatory submissions, and asset recovery coordination with international law enforcement.
The ZecurX Security-First Development Process
Every engagement follows a structured, repeatable, and documented security process — from concept to formal verification.
Threat Modelling
Map attack surface before writing a single line of code.
Secure Architecture
Design patterns selected for security properties first.
Development
Security-aware engineering with inline expert review.
Automated Analysis
Slither, Mythril, Echidna fuzzing on all contract code.
Manual Audit
Expert review of all critical paths and economic logic.
Formal Verification
Mathematical proof for critical logic and state invariants.
What You Receive
Investor-grade documentation and production-ready code delivered at engagement close — not after a separate remediation sprint.
Security Architecture & Threat Model
Attack surface map for your smart contract system or Web3 product — trust boundaries, privileged roles, economic attack vectors, and cross-protocol composability risks documented before development begins. Includes blockchain-native threat model covering flash loan, oracle, governance, and reentrancy attack classes.
Formal Verification Report
Certora Prover and SMTChecker output with mathematical proof of correctness for critical contract logic — demonstrating that specified invariants hold under all possible inputs and states. Accepted by institutional investors, launchpads, and DeFi insurance protocols as the highest standard of contract assurance.
Smart Contract Audit Report
CVSS-scored findings with proof-of-concept exploit code, root cause analysis, and prioritised remediation guidance — suitable for investor disclosure, regulatory submission, and public publication. Includes automated analysis (Slither, Mythril, Echidna) augmented with expert manual review of all critical paths.
Deployment & Post-Launch Package
Production deployment support with verified contract source code, deployment scripts, multi-sig governance configuration, and 30-day post-launch monitoring. Includes gas optimisation report, upgradeability documentation, and incident response runbook — the complete handover package for live protocol management.
Proven Web3 security and development outcomes
How our engagements have prevented exploits, secured treasuries, and recovered stolen assets across the Web3 ecosystem.
12,000 Wallets Onboarded in 30 Days — Zero Security Incidents on Token-Gated Chat Platform
"ZecurX delivered a custom token-gated chat platform in 8 weeks — 3 tier levels based on NFT rarity, E2E encrypted DMs, and automatic access revocation on NFT transfer. The platform onboarded 12,000 wallets in the first 30 days with zero security incidents."
3 Critical Vulnerabilities Found Before $15M TVL Launch — Protocol Launched Without Incident
"A DeFi lending protocol required audit before a $15M TVL launch. ZecurX's review identified three critical vulnerabilities — including a flash-loan-assisted price manipulation path that could have drained the entire liquidity pool. All findings were remediated before deployment. The protocol launched without incident and cited the ZecurX audit report in investor communications."
2,500 NFT Drop Sold Out in 11 Minutes — ₹38L in Secondary Royalties Generated
"ZecurX delivered a fully branded marketplace with Arweave-backed metadata (permanent storage), ERC-2981 royalties, and a private minting portal for brand administrators. The initial drop of 2,500 NFTs sold out in 11 minutes with zero contract incidents. Secondary market royalties have since generated ₹38L in passive creator revenue."
Critical Governance Flash Loan Path Found Before $50M TVL — Architecture Redesigned Pre-Launch
"A yield optimisation protocol preparing for $50M TVL launch engaged ZecurX for a DeFi security review. Our economic modelling identified a governance flash loan attack path that would have allowed a single actor to temporarily acquire a voting majority and pass a malicious upgrade proposal in a single transaction. The finding was considered critical — equivalent vulnerabilities have caused eight-figure losses elsewhere. The governance architecture was redesigned before launch."
3,400 ETH Treasury Secured — 4-of-7 Multi-Sig Implemented Across Geographies
"A Web3 gaming company's treasury (holding 3,400 ETH) was managed by a single EOA (Externally Owned Account) — one compromised developer laptop away from total loss. ZecurX designed and implemented a Gnosis Safe multi-sig governance structure with 4-of-7 signing authority distributed across geographies, hardware wallets, and a timelock delay for large transactions. The treasury has operated without incident since, through three major market volatility events."
Token Holder Retention Up 34% — Multi-Chain Gating Layer Live in 6 Weeks
"ZecurX built a multi-chain gating layer connecting ERC-20 balance thresholds to feature flags in the SaaS platform — with real-time balance monitoring and graceful downgrade UX when token balances dropped below thresholds. Implementation took 6 weeks. The feature increased token holder retention by 34% within 90 days of launch."
$1.1M in Assets Frozen Within 72 Hours — Oracle Exploit Forensics Submitted Across Two Jurisdictions
"A venture-backed DeFi protocol lost $4.2M in an oracle manipulation exploit. ZecurX conducted a full forensic investigation — reconstructing the 14-transaction attack sequence, tracing profits through two bridges and a centralised exchange deposit, and attributing the attack to a cluster of wallets linked to a known threat actor. The forensic report was submitted to law enforcement in two jurisdictions. The exchange froze $1.1M in assets within 72 hours of receiving the report."
Native Expertise Across Every Production Chain
Multi-chain engineering capability across every major production blockchain ecosystem.
Ethereum & EVM
- ◉Solidity (0.8.x) — primary smart contract language
- ◉OpenZeppelin Standards — audited contract libraries
- ◉Hardhat / Foundry — development and testing frameworks
- ◉ERC-20, 721, 1155, 2981 — token and royalty standards
- ◉Arbitrum · Optimism · Base — Layer 2 deployments
Solana Ecosystem
- ◉Rust + Anchor Framework — Solana program development
- ◉Metaplex NFT Standard — NFT creation and management
- ◉SPL Token Program — fungible and non-fungible tokens
- ◉Solana Program Library — core on-chain primitives
- ◉Phantom / Backpack Integration — wallet connectivity
Other Chains
- ◉Polygon (PoS + zkEVM) — low-cost EVM deployment
- ◉Avalanche (C-Chain) — high-throughput EVM environment
- ◉BNB Smart Chain — BSC-native contract deployment
- ◉Cosmos / IBC — interchain protocol development
- ◉LayerZero, Wormhole — cross-chain bridge integration
Regulatory Alignment
Built to satisfy institutional, legal, and investor-grade requirements across Indian and international regulatory frameworks.
India-Specific Frameworks
- ◉CERT-In Cybersecurity Directions — breach reporting obligations for Web3 platforms
- ◉PMLA / ED Compliance — transaction tracing supporting AML obligations
- ◉DPDPA 2023 — on-chain user data minimisation and privacy architecture
- ◉Income Tax Act Section 115BBH — technical documentation for crypto tax compliance
- ◉RBI Virtual Digital Assets guidance for payment-adjacent blockchain systems
- ◉SEBI consultation framework for digital asset securities
International Standards
- ◉FATF Travel Rule — technical implementation for VASPs and crypto exchanges
- ◉MiCA (EU) — Markets in Crypto-Assets Regulation compliance architecture
- ◉ISO/IEC 27001:2022 — development and audit process alignment
- ◉NIST Cybersecurity Framework applied to smart contract risk management
- ◉CCSS (Cryptocurrency Security Standard) — custody and key management
- ◉SOC 2 Type II — security controls documentation for B2B Web3 products
Structured to Match Your Timeline and Delivery Preference
Three commercial structures designed for audit-only, full build, and ongoing protocol security requirements.
Audit-Only
Fixed-scope smart contract security review — automated and manual analysis, CVSS-scored findings report, remediation guidance and re-check, and investor-grade audit certificate. Typical duration: 2–4 weeks. Ideal for protocols approaching launch that require third-party assurance.
Build + Secure
End-to-end development with security embedded throughout — architecture, development, and audit in one engagement with a single accountable team and no handoff risk. Production deployment support and 30-day post-launch monitoring included. Typical duration: 8–20 weeks.
Retainer / Ongoing
Dedicated Web3 security partner for live protocols — contract monitoring and anomaly alerting, protocol upgrade review on demand, blockchain forensics response SLA, and monthly security briefings. Ideal for protocols with live TVL that require continuous security oversight.
Build on-chain. Build with confidence.
Request a complimentary Web3 security scoping session with a ZecurX blockchain engineer — we will review your contract architecture, identify your highest-risk attack surfaces, and outline the fastest path to a production-ready, audit-certified deployment.