Carbon Credit Registries: The Infrastructure Behind Global Carbon Markets
Carbon credit registries are the backbone of both voluntary and compliance carbon markets. They assign unique serial numbers to each verified credit, track ownership transfers, and retire credits upon use — preventing double counting and ensuring market integrity. As the voluntary carbon market matures and regulatory frameworks like Article 6 of the Paris Agreement take effect, the registry landscape is expanding rapidly beyond the traditional "Big Four."
The Dominant Registries
Five major crediting programs — Verra (VCS), Gold Standard, ACR, Climate Action Reserve, and ART TREES — account for approximately 98% of voluntary market volume. Verra alone represented 63% of all credits retired in 2024, with over 1.3 billion credits issued since inception.
ICVCM and the Core Carbon Principles
The Integrity Council for the Voluntary Carbon Market (ICVCM) has established a global quality benchmark through its Core Carbon Principles (CCPs). As of late 2025, eight crediting programs have achieved CCP-Eligible status:
| Program | Focus Area | CCP Status |
|---|---|---|
| Verra (VCS) | Broad (REDD+, renewables, methane) | CCP-Eligible |
| Gold Standard | SDG-aligned projects | CCP-Eligible |
| ACR | Americas-focused | CCP-Eligible |
| Climate Action Reserve | North America | CCP-Eligible |
| ART TREES | Jurisdictional REDD+ | CCP-Eligible |
| Puro.earth | Engineered carbon removal | CCP-Eligible |
| Isometric | Durable carbon removal | CCP-Eligible |
| Equitable Earth | Community-based projects | CCP-Eligible |
Emerging and Regional Registries
Beyond the established programs, a growing number of regional and specialized registries are gaining traction:
- International Carbon Registry (ICR)
- ICROA-endorsed platform with 121+ listed projects across all continents, recently integrated with JPMorgan's Kinexys blockchain for credit tokenization.
- EcoRegistry
- Latin American registry partnering with S&P Global and JPMorgan on blockchain-based carbon credit tokenization at the registry layer.
- BioCarbon Registry
- Formerly PROCLIMA, focused on Latin American GHG mitigation projects with deep expertise in nature-based solutions.
- Global Carbon Council (GCC)
- Middle East and North Africa-focused crediting program supporting regional decarbonization.
Blockchain-Native Platforms
A new generation of blockchain-based registries is challenging traditional infrastructure. The blockchain-based carbon credit platform market was valued at USD 325 million in 2024 and is projected to reach USD 567 million by 2031. Platforms like Carbonmark, Toucan Protocol, and KlimaDAO offer tokenized carbon credits with real-time traceability, fractional ownership, and automated retirement via smart contracts.