We build the contracts, applications, and operational infrastructure behind trustworthy on-chain products. Every engagement starts with a threat model and an honest decision about what belongs on-chain, then ships with invariant tests, multisig controls, monitoring, and an audit-ready evidence pack.
A smart contract can move millions in one transaction and cannot be quietly patched after the fact. That changes the job: the happy path matters less than permissions, upgrade boundaries, price manipulation, key compromise, and what operators do when an assumption fails.
We start with the threat model and the reason a workflow belongs on-chain at all. Then we build the smallest trusted surface, prove its economic invariants, put privileged actions behind explicit controls, and leave an evidence trail an independent auditor can reproduce.
Threat-first
Adversaries and trust boundaries mapped before code
Invariant-led
Economic rules tested across generated transaction sequences
2 keys+
No production privilege held by one person or hot wallet
24 / 7
Contract events and abnormal flows monitored after launch
The contract is one component. A reliable product also needs wallet UX, indexed data, transaction orchestration, controls, and an operating model.
Multisig approval and timelocks keep one compromised key from becoming a protocol-wide incident.
Generated transaction sequences try to violate supply, access, and solvency rules before an attacker does.
Destination state changes only after the source event and its finality proof have been verified.
Contracts for assets, marketplaces, governance, escrow, and protocol logic, with storage layout and upgrade boundaries documented before deployment.
Signing that feels like a product rather than a cryptography lesson, from embedded wallets and passkeys to sponsored transactions and recovery.
Digital-asset issuance and money movement with transfer controls, lifecycle operations, and reconciliation to the system of record.
Integration with liquidity, lending, staking, and exchange protocols, including slippage, oracle, approval, and liquidation failure modes.
The off-chain layer that makes chain state usable: event indexing, confirmations, retries, reorg handling, notifications, and support tooling.
A reproducible evidence pack before an external review, followed by disciplined remediation and deployment controls after findings arrive.
A focused release usually takes eight to fourteen weeks before external audit. Security work starts in the first week rather than in the final one.
1–2 weeks
We map assets, actors, adversaries, and legal or operational constraints, then challenge which state genuinely benefits from shared settlement.
2–3 weeks
State transitions, permissions, invariants, and upgrade rules become a reviewable specification and a working testnet path.
4–6 weeks
Contracts, application, and indexers are built together, then exercised with fuzzing, fork tests, malicious tokens, failed oracles, and abnormal transaction ordering.
2–3 weeks +
We prepare the evidence, resolve auditor findings, rehearse deployment, and launch behind multisig controls with alerts and an incident path already assigned.
A smaller contract surface with explicit trust and upgrade assumptions
Economic invariants enforced by tests, not left in a whitepaper
Wallet and transaction flows ordinary users can complete safely
Production controls and monitoring that continue after the audit PDF
The tools we reach for on Blockchain & Crypto work, picked for the problem in front of us and for the team who inherits the code.
Code that cannot be patched after deploy
Chosen for finality, fees and who is already there
Wallets and signing that non-crypto users survive
Reading chain state without running your own node
Often, only part of it does. Shared settlement earns its cost when multiple parties need a common state without giving one operator unilateral control, or when assets must compose with an existing on-chain market. If one trusted company owns every write and reversal, a signed database is usually faster, cheaper, and safer. We make that boundary explicit before proposing a chain.