Deep dive: Blockchain for carbon markets & MRV — what's working, what's not, and what's next

In 2025, on-chain carbon credit retirements surpassed 45 million tonnes of CO2 equivalent for the first time, yet this figure still represents less than 8% of the total voluntary carbon market volume of approximately 600 million tonnes tracked by Ecosystem Marketplace. That ratio captures the paradox at the heart of blockchain-based carbon markets: the technology has demonstrated clear advantages in transparency and traceability, but adoption remains constrained by fragmentation, regulatory uncertainty, and persistent skepticism from traditional market participants. As the EU Carbon Border Adjustment Mechanism (CBAM) enters its definitive phase in 2026 and the Article 6.4 mechanism under the Paris Agreement begins issuing credits, the infrastructure choices made today will determine whether blockchain becomes the backbone of global carbon accounting or remains a niche tool for early adopters.

Why It Matters

The voluntary carbon market (VCM) has suffered a crisis of credibility. A landmark 2023 investigation by The Guardian, Die Zeit, and SourceMaterial found that more than 90% of rainforest carbon offsets certified by Verra, the world's largest offset standard, were likely phantom credits representing no real emissions reductions. The resulting collapse in credit prices and buyer confidence exposed fundamental weaknesses in the traditional registry model: opaque issuance pipelines, inconsistent monitoring, reporting, and verification (MRV) methodologies, and the persistent risk of double counting across jurisdictional boundaries.

Blockchain technology directly addresses several of these structural problems. Immutable on-chain records prevent double counting by making every issuance, transfer, and retirement publicly auditable. Smart contracts can automate verification workflows, reducing the 12-18 month delays that characterize traditional credit issuance. Tokenization enables fractional ownership, improving liquidity for project developers who currently wait years for revenue. According to the World Bank's Climate Warehouse initiative, interoperable digital registries could reduce transaction costs by 30-50% while increasing market transparency.

For EU-based compliance buyers, the stakes are particularly high. The CBAM requires importers to surrender certificates corresponding to the embedded carbon in goods from non-EU countries starting in 2026. The EU Emissions Trading System (ETS) price reached EUR 68 per tonne in early 2026, creating strong economic incentives for accurate, verifiable carbon accounting. Blockchain-based MRV systems that integrate satellite imagery, IoT sensor data, and automated verification algorithms could provide the audit trails that regulators increasingly demand.

The global carbon market, including both compliance and voluntary segments, was valued at $948 billion in 2024 according to Refinitiv. Even marginal improvements in market efficiency, transparency, and integrity represent billions of dollars in economic value and, more critically, determine whether carbon pricing mechanisms actually deliver the emissions reductions they promise.

Key Concepts

Tokenized Carbon Credits represent the conversion of traditional carbon credits (issued by registries such as Verra, Gold Standard, or the American Carbon Registry) into blockchain-based digital tokens. Each token corresponds to a specific credit with embedded metadata including project type, vintage, methodology, and retirement status. Tokenization enables programmatic settlement, fractional ownership, and integration with decentralized finance (DeFi) protocols. The Toucan Protocol pioneered large-scale tokenization in 2021, bridging over 21 million Verra credits onto the Polygon blockchain before Verra temporarily halted the practice in 2023 to develop its own digital framework.

On-chain MRV refers to monitoring, reporting, and verification processes that store evidence and attestations directly on blockchain infrastructure. Rather than relying on periodic auditor site visits (the traditional model), on-chain MRV integrates continuous data streams from satellites, drones, IoT devices, and remote sensors. Verification algorithms process this data against established baselines, with results cryptographically signed and recorded on-chain. dMRV (digital MRV) platforms such as Hyphen Global and Regen Network have demonstrated that automated verification can reduce credit issuance timelines from 18 months to as few as 45 days for certain project types.

Interoperable Registries address the fragmentation problem that currently divides carbon markets across dozens of incompatible registry systems. The World Bank's Climate Action Data Trust (CAD Trust), launched in late 2023, uses distributed ledger technology to create a meta-registry connecting Verra, Gold Standard, the Architecture for REDD+ Transactions (ART), and national registries. Interoperability prevents double counting across registries and enables cross-border credit transfers required under Article 6 of the Paris Agreement.

Smart Contract Settlement automates the execution of carbon credit transactions according to predefined rules encoded in self-executing contracts. Applications include: automatic retirement upon delivery to a compliance buyer, escrow mechanisms that release payment only upon verified emission reductions, and programmatic distribution of revenue to project stakeholders. KlimaDAO's retirement aggregator processes over 15,000 retirements per month using smart contracts that interact with multiple on-chain credit pools.

Blockchain Carbon Market KPIs: Benchmark Ranges

Metric	Below Average	Average	Above Average	Top Quartile
Credit Issuance Time (dMRV)	>12 months	6-12 months	2-6 months	<2 months
Transaction Cost per Credit	>$2.00	$0.50-2.00	$0.10-0.50	<$0.10
Double-Counting Detection Rate	<60%	60-80%	80-95%	>95%
On-chain Data Completeness	<40%	40-65%	65-85%	>85%
Registry Interoperability Score	1 registry	2-3 registries	4-6 registries	>6 registries
Smart Contract Audit Coverage	None	Basic audit	Comprehensive audit	Formal verification

What's Working

Toucan Protocol and the Base Carbon Tonne

Despite early controversy, Toucan Protocol has matured into the most liquid on-chain carbon market infrastructure. By early 2026, over 25 million credits had been bridged through Toucan's smart contracts, with the Base Carbon Tonne (BCT) and Nature Carbon Tonne (NCT) serving as benchmark price references. Toucan's partnership with Verra, formalized in 2025 after two years of negotiation, established a sanctioned bridging framework that addresses concerns about unauthorized tokenization. The BCT pool has processed over $180 million in cumulative trading volume, providing project developers with liquidity that traditional over-the-counter markets struggle to match. Celo and Polygon remain the primary blockchain networks hosting Toucan pools, with transaction costs averaging $0.02 per retirement.

Pachama's Satellite-Powered Forest Carbon Verification

Pachama has emerged as the leading dMRV platform for forest carbon projects, using a combination of LiDAR, satellite imagery, and machine learning to evaluate carbon stocks across 15 million hectares of monitored forest. Their platform processes imagery from Sentinel-2, Landsat, and commercial providers to generate biomass estimates with 85-90% correlation to ground-truth measurements. In 2025, Pachama's technology was adopted by major corporate buyers including Microsoft, Shopify, and Salesforce as a due diligence layer for offset procurement. The company raised $79 million in Series C funding in 2024, led by Lowercarbon Capital, reflecting investor confidence in technology-driven verification.

World Bank Climate Action Data Trust

The CAD Trust represents the most ambitious interoperability initiative in carbon markets. Launched with participation from Singapore, Chile, Rwanda, and the European Commission, CAD Trust connects five major carbon registries through a permissioned distributed ledger that enables real-time cross-referencing of credit issuances and retirements. By Q4 2025, the platform tracked over 1.2 billion credits across participating registries, providing the first comprehensive global view of carbon credit lifecycle data. The initiative is critical for Article 6 implementation, where corresponding adjustments between countries require absolute certainty that credits are not double counted.

What's Not Working

Regulatory Fragmentation Across Jurisdictions

The absence of harmonized regulations for tokenized carbon credits creates significant barriers for cross-border market participants. The EU's Markets in Crypto-Assets (MiCA) regulation, fully effective since January 2025, classifies certain carbon tokens as financial instruments subject to prospectus requirements, while the US Commodity Futures Trading Commission (CFTC) has signaled that carbon tokens may fall under derivatives regulation. Singapore's Monetary Authority treats tokenized credits as digital payment tokens. This patchwork forces platforms to maintain multiple compliance frameworks, increasing costs by 20-35% according to industry estimates. Several projects have restricted access to EU users entirely rather than navigate MiCA compliance.

Quality Concerns Persist Despite Transparency

Putting credits on-chain does not inherently improve their quality. The "garbage in, garbage out" problem remains acute: if the underlying carbon project overstates its baseline or applies flawed additionality assumptions, tokenizing the resulting credits simply creates a transparent record of a flawed instrument. The 2024 collapse of several on-chain credit pools containing low-quality REDD+ credits demonstrated that blockchain transparency alone is insufficient. BeZero Carbon Ratings and Sylvera have begun providing on-chain quality scores, but standardized quality frameworks for tokenized credits remain in early development.

Liquidity Fragmentation Across Chains

The proliferation of carbon credit tokenization across multiple blockchain networks (Ethereum, Polygon, Celo, Solana, and proprietary chains) has fragmented liquidity rather than consolidating it. A buyer seeking nature-based credits might find pools on three different networks, each with different bridge mechanisms, gas fee structures, and counterparty risks. Cross-chain bridges have proven vulnerable to exploits, with over $2.5 billion lost to bridge hacks across the broader crypto ecosystem between 2021 and 2025. Carbon market participants, particularly institutional buyers, cite this fragmentation as a primary barrier to adoption.

Scalability of dMRV for Non-Forest Projects

While satellite-based verification works well for forest and land-use projects, extending dMRV to other project categories remains challenging. Cookstove projects, methane capture, and industrial efficiency improvements require fundamentally different monitoring approaches that cannot rely solely on remote sensing. Sensor-based IoT monitoring is technically feasible but faces cost, connectivity, and maintenance challenges in developing regions where many carbon projects operate. Less than 15% of non-forest carbon projects had dMRV integration as of late 2025, according to the International Emissions Trading Association (IETA).

Key Players

Established Leaders

Verra remains the dominant carbon credit standard, certifying over 75% of voluntary market credits. Their evolving digital strategy, including partnerships with Toucan and development of the Verra Digital Registry, signals acceptance of blockchain infrastructure.

Gold Standard has integrated digital verification tools and partnered with technology providers to pilot on-chain issuance for select project types, maintaining its reputation for high-integrity credits.

ICE (Intercontinental Exchange) operates carbon futures markets and has invested in tokenization infrastructure, positioning traditional financial market plumbing alongside emerging blockchain alternatives.

Emerging Startups

Toucan Protocol provides the leading open-source infrastructure for carbon credit tokenization, with BCT and NCT pools serving as primary on-chain liquidity venues.

Pachama delivers AI-powered forest carbon verification with satellite and LiDAR analysis, offering buyers independent quality assessment and continuous monitoring.

Hyphen Global focuses on end-to-end dMRV infrastructure, integrating IoT sensors and satellite data with blockchain-based attestation for diverse project types.

Flowcarbon raised $70 million in 2022 and has pivoted toward institutional-grade tokenized carbon products, targeting compliance buyers with regulated token structures.

Key Investors and Funders

Lowercarbon Capital led by Chris Sacca has made significant investments in carbon market infrastructure including Pachama and several dMRV startups.

a16z Crypto (Andreessen Horowitz) invested in Flowcarbon and has a broader thesis on blockchain-enabled environmental markets.

European Commission Innovation Fund provides grant funding for digital carbon market infrastructure projects aligned with EU Green Deal objectives, including pilot programs for Article 6 implementation.

What's Next

The most consequential near-term development is the operationalization of Article 6.4 under the Paris Agreement. The Article 6.4 Supervisory Body approved initial methodologies in late 2025, and the first credits are expected by mid-2026. The digital infrastructure built to support Article 6.4 will likely set the template for global carbon market architecture for decades. Countries including Singapore, Switzerland, and Japan have explicitly signaled interest in blockchain-based corresponding adjustment mechanisms.

The convergence of AI and blockchain for MRV represents the most promising technical frontier. Systems combining machine learning for anomaly detection, satellite imagery for continuous monitoring, and blockchain for immutable record-keeping could create verification frameworks that are both more rigorous and less expensive than traditional approaches. Pilot projects in 2025 demonstrated that AI-augmented dMRV can reduce verification costs by 60-70% while increasing monitoring frequency from annual audits to near-real-time assessment.

Institutional adoption will accelerate as regulatory clarity improves. The EU's pilot regime for DLT-based market infrastructure, extended through 2026, provides a sandbox for tokenized carbon products. Major financial institutions including HSBC, Standard Chartered, and BNP Paribas have announced pilot programs for blockchain-based carbon credit trading, lending credibility to the technology while signaling demand from compliance-oriented buyers.

Action Checklist

• Evaluate on-chain carbon credit procurement against traditional OTC markets for cost, transparency, and speed
• Assess MiCA and local regulatory implications before engaging with tokenized carbon credit platforms
• Require independent quality ratings (BeZero, Sylvera, or Calyx Global) for any on-chain credits considered for purchase
• Implement cross-registry verification using CAD Trust or equivalent infrastructure to prevent double-counting exposure
• Pilot dMRV integration for portfolio carbon projects, starting with forest and land-use categories
• Engage legal counsel on the classification of tokenized carbon credits under local securities and commodities regulations
• Develop internal policies distinguishing between compliance-grade and voluntary market on-chain credits
• Monitor Article 6.4 Supervisory Body decisions for implications on cross-border credit recognition

FAQ

Q: Are tokenized carbon credits legally equivalent to traditional registry credits? A: Legal equivalence depends on jurisdiction and the specific tokenization mechanism. Credits bridged through sanctioned partnerships (such as Toucan's agreement with Verra) maintain their registry status and retirement validity. However, tokenized credits may trigger additional regulatory requirements under MiCA in the EU or securities regulations in the US. Buyers should verify that on-chain retirement results in corresponding retirement on the underlying registry to avoid legal ambiguity.

Q: How does blockchain-based MRV compare to traditional third-party verification in terms of accuracy? A: For forest carbon projects, dMRV platforms like Pachama achieve 85-90% correlation with ground-truth measurements, comparable to traditional site-visit audits that typically achieve 80-92% accuracy. The key advantage of dMRV is frequency rather than precision: continuous satellite monitoring detects reversals (such as deforestation or wildfire) within days rather than waiting for annual audit cycles. For non-forest projects, traditional verification currently remains more reliable due to the limitations of remote sensing for process-level emissions monitoring.

Q: What is the cost of implementing blockchain-based carbon market participation for a mid-sized company? A: Direct procurement of on-chain credits requires minimal infrastructure, typically just a compatible wallet and access to a platform like Toucan or KlimaDAO, with transaction costs of $0.01-0.10 per credit retirement. For companies developing their own carbon projects with dMRV integration, implementation costs range from $50,000-250,000 depending on project type, sensor infrastructure requirements, and chosen verification platform. Ongoing monitoring costs run $10,000-50,000 annually. These figures compare favorably to traditional verification costs of $30,000-80,000 per audit cycle.

Q: Is blockchain necessary for carbon market integrity, or can traditional databases achieve the same outcomes? A: Centralized databases can replicate many blockchain features, including transaction logging and audit trails. The distinct advantages of blockchain are: resistance to retroactive tampering (critical for credits representing 30-100 year commitments), interoperability across organizations without requiring a trusted central authority, and programmable settlement through smart contracts. For single-registry domestic markets, centralized databases may suffice. For cross-border markets involving multiple registries, jurisdictions, and counterparties, blockchain's trust-minimized architecture provides structural advantages that centralized alternatives cannot easily replicate.

Q: How will Article 6 of the Paris Agreement affect blockchain carbon markets? A: Article 6 creates both opportunity and complexity. Article 6.2 (bilateral credit transfers between countries) requires corresponding adjustments to national emissions inventories, creating demand for infrastructure that can track credits across jurisdictional boundaries. Article 6.4 (the centralized crediting mechanism) will issue credits under UN oversight with digital infrastructure requirements. Blockchain platforms that integrate with the Article 6.4 registry and automate corresponding adjustments will capture significant market share. However, the Supervisory Body has not yet mandated specific technology standards, leaving open the possibility that proprietary or centralized solutions may compete.

Sources

• Ecosystem Marketplace. (2025). State of the Voluntary Carbon Market 2025: Market Outlook and Credit Prices. Washington, DC: Forest Trends.
• World Bank. (2025). Climate Action Data Trust: Year One Progress Report. Washington, DC: World Bank Group.
• IETA. (2025). Digital MRV for Carbon Markets: Technology Assessment and Adoption Barriers. Geneva: International Emissions Trading Association.
• Refinitiv. (2025). Carbon Market Year in Review 2024. London: London Stock Exchange Group.
• European Commission. (2025). CBAM Implementation: Technical Standards for Carbon Accounting. Brussels: European Commission Directorate-General for Taxation.
• Verra. (2025). Digital Strategy and Tokenization Framework. Washington, DC: Verra.
• UNFCCC. (2025). Article 6.4 Supervisory Body: Approved Methodologies and Implementation Guidelines. Bonn: United Nations Framework Convention on Climate Change.