Carbon registries record projects, issue serialised units, track ownership and document retirement. They provide the infrastructure that prevents the same unit from circulating after it has been used.
Standard, methodology and registry
A standard sets programme rules. A methodology defines how a specific project type calculates outcomes. The registry records the project and units. In some systems these functions sit within one organisation, while others use connected platforms.
The project lifecycle
A project submits documentation, completes validation and registers. After a monitoring period, it prepares a monitoring report and passes independent verification. The programme reviews the package and issues units with unique serial numbers.
Units can then transfer between accounts. Retirement permanently removes them from circulation and records the beneficiary and purpose where the registry supports those fields.
What buyers should check
Registry records confirm status, issuance and retirement, but buyers should still review methodology, project documents, verifier, vintage and any labels or eligibility conditions. A transfer into an account is not the same as retirement, and a cancellation reason should match the intended claim.
Major programmes
Verra's Verified Carbon Standard covers a broad range of project types. Gold Standard combines climate outcomes with sustainable development requirements. Other programmes include the American Carbon Registry, Climate Action Reserve, Puro.earth and specialist systems for durable removals or environmental attributes.
The best choice depends on project type, geography, buyer use and methodology quality rather than brand recognition alone.
Sentinel Earth develops projects across multiple standards and helps buyers interpret registry evidence through our carbon credit sourcing process.
