guardian | open-source digital mrv
From methodology to verified credit
Guardian is open-source software that turns environmental methodologies into digital workflows. Project developers, auditors, standards bodies and buyers work from one shared, auditable record, so every claim can be traced back to its data.
sustainable impact studios
Four studios, scaling impact
Open-source studios support the entire project lifecycle, from origination to financing and from issuance to retirement, helping prove environmental claims along the way. They digitize the methodology, issue and track the asset, finance the project, and prove where the money went. Each works on its own, and they are built to work together on Hedera.
Methodology and dMRV
Hedera Guardian
Digitize methodologies and prove every claim
Guardian is a digital operating framework for methodology digitization and integrated measurement, reporting, and verification. Standardized forms, automated workflows, and connected data streams link projects, auditors, corporates, and standards bodies into a single auditable record. Teams have used it to build the world’s largest open-source library of digitized methodologies, spanning carbon credits, biodiversity, renewable energy, and emissions tracking.
- Digitizes methodologies Turns 100+ page environmental protocols into standardized digital workflows.
- Connects stakeholders Project developers, auditors, corporates, and standards bodies work from one shared record.
- Proves integrity Every dataset and decision is auditable and traceable from source to claim.
Registry infrastructure
Carbon Registry
Government-grade registry infrastructure, open to any country
The National Carbon Registry is an open-source registry system initiated by UNDP as a Digital Public Good, so countries and standards bodies can manage carbon projects, credits, issuances, transfers, and retirements without building proprietary infrastructure from scratch. Running on Hedera, it anchors every data event to a public ledger and links it to digital MRV flows in Guardian, creating a provable chain of custody for carbon units.
- Article 6.2 ready Tracks corresponding adjustments, international transfers, and reporting in UNFCCC formats.
- Sovereign control Countries decide who can register projects, approve issuances, or link to carbon credits.
- No licensing fees Open-source code any country or standard can adopt, extend, or integrate into existing systems.
Sustainable finance
ATS for Sustainable Finance
Turn static sustainable bonds into programmable assets
The Asset Tokenization Studio transforms sustainable bonds, typically illiquid and manually administered, into transparent and programmable digital instruments. Its Asset Smart Contract encodes contractual terms and compliance rules as executable logic, enabling automated lifecycle actions, real-time ownership tracking, and secure integration with verified ESG oracles. The result is a fractionalizable digital asset built for institutional capital markets.
- KPI-linked rates Oracle-verified KPI data attested through Guardian triggers interest-rate adjustments or penalties automatically.
- Compliance as code Whitelisting of authorized investors and eligible projects is enforced on-chain across the asset lifecycle.
- Market liquidity Securities-leg settlement for trades executed on external secondary-market platforms.
Fund management
Treasury module
Prove where the proceeds went
The Treasury Module solves the black box problem in sustainable finance: the lack of visibility and verifiable control over how bond proceeds are allocated and managed. It replaces opaque SPV and asset-manager structures with a smart-contract-governed treasury, executing and recording every fund movement and project allocation on-chain across the bond’s entire lifecycle.
- Controlled disbursement Funds move only to pre-approved project wallets, managed in regulated stablecoins.
- Unified custody Financial returns and environmental assets such as carbon credits and forwards are tracked in one place.
- Real-time audit trail Immutable evidence of fund allocation and asset custody for investors and regulators.
key differentiators
The Guardian difference
Trust and transparency
Guardian records every step of the sustainability data lifecycle on Hedera, making the process tamper-evident and transparent to all stakeholders, from regulators to end customers.
Comparable, auditable data
Guardian structures project data to the methodology it follows, so every claim traces back to its source. Gaps, inconsistencies and differences between projects become visible, helping auditors, and the AI tools they use, flag issues sooner.
Cut time to issuance
Guardian automates the issuance of digital environmental assets, improving trust while reducing the time and cost involved in issuing, reporting, and verifying carbon assets.
modular and customizable
Open-source toolkit for digital MRV
As a Digital Measurement, Reporting and Verification (dMRV) tool, Guardian enables trusted tokenization of sustainability assets. Organizations can extend or adapt the platform for use cases like supply chain emissions tracking, green bonds, or renewable energy certification.
standards and registries
Built with the bodies that set the standards
Verra, Gold Standard and UNDP’s National Carbon Registry all work with Guardian, so project data can move from methodology to verification to registry in one traceable format.
case study
Verra chooses Hedera as its chain of record
Verra, the world’s largest carbon credit standards body, is using Hedera to anchor trusted environmental data. By integrating the Blue Carbon (ABC) Mangrove Restoration Project in Senegal through Hedera, Verra is helping eliminate inaccurate, fragmented data and prevent premature or unsupported claims.
Learn more about Guardian
guardian resources
Featured resources
success stories
Who is building on Guardian
ecosystem
Sustainability ecosystem
Guardian integrates with third-party providers, offering tools and services for the next generation of sustainability solutions.
see what others are saying
Trusted for the real world
This collaboration represents a significant advancement in Verra’s digitalisation strategy, enhancing our ability to deliver more efficient, transparent, and scalable climate action. Integrating Hedera Guardian with the Verra Project Hub represents a meaningful step toward improving the way we serve our stakeholders.
Mandy Rambharos
CEO
Hedera provides the network bandwidth and low-costs that B4E requires to process the amount of data needed to tokenize robust environmental claims. This is critical for the scaling required for industry-wide adoption.
Rebecca Hofmann
CEO
By combining the strengths of EcoRegistry with the advanced capabilities of Hedera Guardian, we are setting new standards for transparency and accountability in carbon trading.
Juan Durán
CEO
Discover why innovators trust Guardian for sustainability
Thanks — your submission has been received.
Sorry, something went wrong submitting the form. Please try again, or email us if the problem continues.