Verifiable data and cryptographic proofs.
We build proof systems that turn assertions into verifiable facts. From blockchain native Merkle trees and zero knowledge circuits to supply chain provenance, regulatory attestations, and compliance audit trails, we engineer the verification layer that earns trust across industries.
What we prove.
Every proof system we build starts with a question. Who needs to believe what, and what is the cheapest honest way to convince them. These are the verification systems we design most often, spanning blockchain protocols and traditional industries alike.
Merkle Proof Systems
We build Merkle tree infrastructure for efficient verification of large datasets. A single root hash commits to millions of records, and any individual record can be verified with a compact proof. We use this for airdrop eligibility, batch transaction verification, snapshot commitments, and any scenario where a large dataset needs to be provable without publishing every record on chain.
- Merkle tree construction for airdrop and distribution proofs
- Batch transaction verification with compact inclusion proofs
- Snapshot commitments for periodic data anchoring
- Sparse Merkle trees for membership and exclusion proofs
Zero Knowledge Proofs
We design zero knowledge circuits for scenarios where the data is too sensitive to reveal or where verification on chain must be cheap regardless of computational complexity off chain. Eligibility proofs that confirm a user qualifies without exposing personal data. Confidential transactions where amounts stay private. Compliance attestations that prove regulatory status without leaking the underlying records.
- Privacy preserving eligibility and membership proofs
- Confidential transaction verification without data exposure
- Selective disclosure for identity and credential systems
- Recursive proofs for aggregating multiple attestations
Proof of Reserves
We build proof of reserves systems that pair asset snapshots with Merkle committed liability trees. Any individual user can verify their balance is included in the tree, and independent auditors can confirm that total assets exceed total liabilities. We design for the operational reality of rotating wallets, off book obligations, and publication cadences that compliance teams can sustain.
- Merkle liability trees with individual user verification
- Anchored asset snapshots across multiple chains and custodians
- Automated publication pipelines with configurable cadence
- User facing verification tooling and transparency dashboards
On Chain Attestations
We implement attestation systems using the Ethereum Attestation Service and custom schema registries. Attestations bind off chain facts to on chain identity, creating a verifiable record that any third party can check. We use this for reputation systems, credential verification, KYC status flags, and any claim that needs to be both machine readable and publicly verifiable.
- EAS schema design and registration for custom claim types
- Delegated and self issued attestation workflows
- Revocable attestations with expiration and renewal logic
- Attestation indexing and query APIs for downstream consumers
Supply Chain Provenance
We build provenance tracking systems that record every handoff in a product's journey from origin to destination. Each transfer of custody generates a signed, timestamped attestation anchored to a verifiable record. We work across pharmaceuticals, luxury goods, food and agriculture, and industrial components, designing for the operational constraints of warehouse floors, shipping docks, and factory lines.
- Product origin tracking from raw material to retail shelf
- Chain of custody records with signed handoff attestations
- NFC and QR code integration for physical product verification
- Counterfeit detection through verifiable provenance history
Compliance and Audit Trails
We design append only audit trail systems where every record is cryptographically linked to the one before it, making retroactive tampering detectable. These systems serve financial reporting, regulatory filings, clinical trial documentation, and any domain where proving that records were not altered after the fact is a legal or operational requirement.
- Hash chained audit logs for financial and regulatory records
- Proof of existence timestamping for documents and filings
- Periodic anchoring of off chain databases to on chain commitments
- Exportable verification packages for auditors and regulators
Identity and Credential Verification
We build systems where identity claims and professional credentials can be verified without exposing the underlying personal data. A KYC provider attests that a user passed verification. An employer attests that a professional holds a valid license. The verifier checks the attestation without ever seeing the passport scan, the tax return, or the credential database. Privacy by architecture, not by policy.
- KYC attestations that confirm status without sharing documents
- Professional credential proofs for licenses and certifications
- Age and jurisdiction verification with selective disclosure
- W3C Verifiable Credential issuance and verification pipelines
Carbon and ESG Attestation
We build verification systems for environmental and sustainability claims. Carbon credit issuance and retirement tracked through verifiable on chain records. Ethical sourcing attestations that trace materials back to certified suppliers. Impact reporting backed by auditable data rather than self reported figures. These systems give ESG claims the same rigor that financial statements receive from auditors.
- Carbon credit lifecycle tracking from issuance through retirement
- Ethical sourcing attestations linked to supplier certifications
- Sustainability impact metrics anchored to verifiable data sources
- Transparent offset registries with public retirement records
Where proofs solve real problems.
Cryptographic verification is not limited to blockchain protocols. These scenarios reflect the types of proof system engagements we take on across regulated industries, global supply chains, and enterprise compliance.
Pharmaceutical supply chain traceability
A pharmaceutical distributor needed to prove that every unit of medication could be traced from manufacturer to pharmacy without gaps. The solution uses a provenance system where each custody transfer generates a signed attestation anchored to an on chain commitment. Pharmacists scan a product and verify its full chain of custody. Regulators receive exportable audit packages covering any time window. The system detects gaps, inconsistencies, and unauthorized handoffs automatically.
Financial compliance and regulatory attestation
A financial services firm needed timestamped proof that specific regulatory filings existed at specific points in time, creating an immutable record for MiFID and SOX compliance. The approach uses a proof of existence system that periodically hashes document sets and anchors the commitment on chain. Auditors verify that no filing was backdated or altered after submission. The system produces verifiable timestamps that hold up under regulatory scrutiny without exposing the content of the documents themselves.
Luxury goods authentication
A luxury brand wanted customers to verify product authenticity at the point of sale using their phone. The solution uses an NFC tag system where each physical product is paired with an on chain provenance record at the factory. Every transfer between distributor, retailer, and buyer generates a signed attestation. A customer taps the product with their phone and sees the full provenance history, confirming it is genuine and has never been flagged as lost or stolen.
Carbon credit marketplace verification
A carbon marketplace needed transparent tracking of credit issuance, trading, and retirement so that buyers could prove their offsets were genuine and had not been double counted. The solution uses a system where every credit is issued as a verifiable on chain record linked to the underlying certification. Retirement is permanent and publicly visible. Buyers receive a verifiable retirement certificate, and regulators can audit the full lifecycle of any credit from project registration through final retirement.
Cross border trade documentation
A logistics firm managing cross border shipments needed to replace paper based bills of lading, certificates of origin, and customs declarations with cryptographically verifiable digital equivalents. The solution uses a document attestation system where each trade document is hashed and signed by the issuing party, with the commitment anchored on chain. Customs authorities verify document authenticity without contacting the issuer. Banks processing letters of credit confirm that the underlying documents are genuine and unaltered.
Real estate title verification
A title insurance company wanted to reduce the cost and time of title searches by maintaining a verifiable record of property ownership attestations. The solution uses a system where each title transfer generates an on chain attestation signed by the recording authority. Lien holders register their claims against the same record. Title searches that previously required weeks of manual record review now produce a verifiable ownership history in seconds, with every claim backed by a cryptographic signature from the issuing authority.
The primitives behind every proof.
Different verification problems call for different cryptographic tools. We choose the simplest primitive that solves the actual problem, and we are honest about when a sophisticated approach is justified and when a straightforward one will do.
Merkle Trees and Proofs
Merkle trees are the workhorse of data verification. A tree of hashes reduces any dataset to a single root commitment. Anyone holding a leaf value can verify its inclusion using a compact proof that grows logarithmically with the dataset size. We use Merkle trees for airdrop distributions, liability commitments, periodic data snapshots, and any system that needs to commit to a large dataset cheaply and allow individual verification later.
We also implement sparse Merkle trees for scenarios that require both inclusion and exclusion proofs, and incremental Merkle trees for append only systems like audit logs where the dataset grows over time.
Zero Knowledge Proof Systems
Zero knowledge proofs allow one party to convince another that a statement is true without revealing anything beyond the truth of the statement itself. We work across multiple ZK frameworks depending on the requirements.
- zk SNARKs for succinct proofs with fast on chain verification
- zk STARKs for transparent setup and quantum resistance
- Circom for arithmetic circuit design with Groth16 and PLONK backends
- Noir for higher level ZK development with Rust like syntax
- Halo2 for recursive proof composition without trusted setup
On Chain Attestations
Attestations are signed claims made by one entity about another. Unlike tokens, attestations represent facts rather than assets. The Ethereum Attestation Service provides a standardized framework for creating, registering, and verifying attestations on chain. We design custom attestation schemas for specific use cases and build the issuance, verification, and revocation workflows around them.
For cross chain scenarios, we implement attestation bridging so that a claim made on one network can be verified on another without requiring the verifier to interact with the originating chain.
Tamper Evident Logging
Hash chains create append only records where every entry includes a cryptographic link to the previous one. Altering any historical record breaks the chain and becomes immediately detectable. We build tamper evident log systems for audit trails, regulatory filings, clinical trial records, and any domain where the integrity of historical data is critical.
- Hash chained log entries with periodic on chain anchoring
- Verifiable append only databases for regulatory compliance
- Certificate transparency style systems for public accountability
- Independent verification tooling for auditors and regulators
How we approach every proof system.
A proof is only as honest as the data that feeds it and the pipeline that generates it. Our process reflects that reality, treating data integrity and operational reliability as first class concerns alongside cryptographic correctness.
Data Architecture and Schema Design
We start by mapping what needs to be proved, to whom, and under what constraints. We define the data schemas that will feed the proof system, identify the trust assumptions at each data source, and design the ingestion pipeline that moves data from operational systems into the proving layer. If the source data is unreliable, no amount of cryptography will fix the output.
We also design the attestation schemas or tree structures at this stage, choosing field types, encoding formats, and indexing strategies that will support both the proving use case and the verification queries that downstream consumers will run.
Proof Circuit or Tree Design
For zero knowledge systems, we design the arithmetic circuit that encodes the statement to be proved. We think carefully about circuit size, constraint count, and prover time, because a circuit that is correct but takes hours to prove is not a usable system. For Merkle based proofs, we design the tree structure, leaf encoding, and hash function selection. For attestation systems, we define the schema registry and the issuance workflow.
We prototype early and benchmark aggressively. The gap between theoretical proof generation time and real world performance on production hardware is often significant, and we surface those numbers before architecture decisions become irreversible.
On Chain Verification Contract
The on chain component is the trust anchor. For Merkle proofs, this is the contract that stores root commitments and verifies inclusion proofs. For zero knowledge systems, this is the verifier contract that checks proofs in constant time regardless of the computation's complexity. For attestation systems, this is the schema registry and attestation store. We build these contracts with the same security discipline we apply to any smart contract, including threat modeling, property based testing, and formal verification where warranted.
Off Chain Proof Generation Pipeline
Most of the computational work in a proof system happens off chain. We build the prover infrastructure as a production service with monitoring, error handling, and retry logic. For zero knowledge proofs, this means managing prover hardware, parallelizing witness generation, and handling the memory requirements of large circuits. For Merkle trees, this means building the tree construction pipeline that ingests data, computes the tree, and publishes the root.
We design these pipelines to be reproducible. Given the same inputs, the pipeline produces the same outputs. This reproducibility is essential for independent verification and auditor trust.
Integration and API Layer
Proof systems do not exist in isolation. They connect to operational databases, user facing applications, auditor portals, and regulatory reporting systems. We build the API layer that lets downstream consumers request proofs, verify claims, and export verification packages. We design for the actual users of the system, whether that is a warehouse worker scanning a product, a compliance officer generating a report, or a smart contract verifying a proof on chain.
Monitoring and Audit Interface
We build the observability layer that lets operators see whether the proof system is healthy. This includes monitoring for proof generation latency, root publication frequency, verification success rates, and data pipeline integrity. We also build the audit interface that external reviewers use to independently verify the system's claims. If the proof system cannot be audited by a stranger with a laptop, it has not earned the trust it claims to provide.
Built on open standards.
We build on established standards and open protocols wherever possible. Standards provide interoperability, reduce vendor lock in, and mean that the systems we build can be verified by anyone, not just the team that built them.
Ethereum Attestation Service
EAS provides a decentralized, open source protocol for creating and verifying on chain attestations. We use EAS for reputation systems, credential verification, KYC status flags, and any scenario where a signed claim needs to be publicly verifiable. We design custom attestation schemas, build issuance workflows, and integrate attestation verification into downstream applications and smart contracts.
W3C Verifiable Credentials
The W3C Verifiable Credentials standard defines a data model for expressing credentials on the web in a way that is cryptographically verifiable, privacy respecting, and machine readable. We implement VC issuance and verification pipelines for identity systems, professional credentials, educational certificates, and organizational memberships. Credentials can be presented selectively, revealing only the claims needed for a specific interaction.
ZK Proof Frameworks
We work across the major zero knowledge proof frameworks and choose based on the requirements of each project. Circom for mature arithmetic circuit development with Groth16 proving. Noir for developer friendly circuit authoring with a Rust like language. Halo2 for recursive proof composition. We evaluate each framework against proving time, verification cost, trusted setup requirements, and the maturity of its tooling and auditing ecosystem.
Supply Chain and Industry Standards
For supply chain provenance, we align with GS1 EPCIS for event data exchange, ensuring that the proof systems we build interoperate with existing supply chain infrastructure. For clinical trials, we design around 21 CFR Part 11 requirements for electronic records. For financial compliance, we structure audit trails to meet the retention and integrity requirements of MiFID II, SOX, and comparable regulatory frameworks.
Tools we use daily.
We choose tools based on the problem, not habit. These are the languages, frameworks, and proof tooling we work with across our verification engagements.
ZK Circuit Development
We build zero knowledge circuits across multiple frameworks, choosing the right tool for each project's constraints around proving time, verification cost, and developer experience.
On Chain Verification
The trust anchor lives on chain. We build verifier contracts, attestation registries, and Merkle root stores using battle tested smart contract frameworks and libraries.
Off Chain Infrastructure
Proof generation, tree construction, and data pipelines run off chain as production services. We build these with the same reliability and monitoring standards we apply to any backend infrastructure.
Standards and Protocols
We build on open standards for interoperability and long term viability. Every proof system we design can be verified independently using public tooling and documented specifications.
Adjacent work we do.
Smart contract systems
The on chain layer that enforces what proofs describe. Threat modelled, audited, and built for the contracts that verify your proofs.
Tokens & tokenization
Token standards and distribution logic that work alongside attestations and Merkle based eligibility proofs.
Governance & treasury
On chain voting and treasury management with the same verifiability and audit trail discipline we bring to proof systems.
If you need to prove it, not just say it.
Tell us what you need verified and who needs to believe it. We will tell you whether a Merkle tree, a ZK circuit, an attestation, or a straightforward audit trail is the right answer.