When the Integrity Council for the Voluntary Carbon Market (ICVCM) published the Core Carbon Principles (CCPs) and the accompanying Assessment Framework in 2023, the immediate market reaction was to treat CCP-eligibility as an external badging exercise. That framing has not survived contact with implementation. As of mid-2025, ICVCM has announced CCP-Approved methodologies covering ozone-depleting substances, landfill gas, multiple clean-cookstove versions, and — in June 2025 — adipic acid and additional cookstove versions, alongside CCP-Eligible carbon-crediting programs including ACR, Climate Action Reserve, Gold Standard, ART TREES, and ERS [1][2][3].
What the label actually requires
Under the ICVCM Assessment Framework, a CCP-labelled credit must satisfy ten Core Carbon Principles covering governance (effective governance, tracking, transparency, robust independent third-party validation and verification), emissions impact (additionality, permanence, robust quantification, no double counting), and sustainable development (sustainable development benefits and safeguards, contribution to net-zero transition). The label is assigned to credits that come from a CCP-Approved methodology issued by a CCP-Eligible program — a two-gate test.
What is often missed is that 'CCP-Approved methodology' is not a one-time decision. ICVCM assesses specific methodology versions, and version upgrades trigger re-assessment. In June 2025 ICVCM explicitly approved 'further clean-cookstove methodology versions' — confirming that the unit of decision is the methodology version, not the methodology family [3].
Registry-level implications
The Assessment Framework requirements cut across nearly every layer of a registry's data model:
Evidence chains at credit level. Retrievable evidence for additionality, baseline, and quantification must be attached at the credit (vintage) level, not just at the project level. Registries built before CCP existed are now retrofitting cohort-level evidence indexing.
Methodology version tracking. Each issued vintage must record the specific methodology version used. With ICVCM approving discrete versions, the registry must distinguish a CCP-labelled vintage from a non-CCP vintage of the same project. Verra's CCP Label Guidance v1.1 operationalises this at the VCU level [4].
Retirement metadata. Retirements must carry sufficient metadata to support corporate claims under emerging guidance such as the VCMI Claims Code of Practice and the SBTi Beyond Value Chain Mitigation framework. Minimum-viable retirement metadata now includes beneficiary, claim type, vintage, methodology version, and CCP-label status.
Lifecycle re-assessment. Because CCP-Approval can be revoked or refined, registries need a re-labelling process — what happens to outstanding labelled units if the methodology version is downgraded? This is not yet uniformly handled across programs.
Methodology developer implications
Methodology developers face a more demanding evidence burden. Additionality assessments must withstand the Framework's 'conservative' and 'science-based' tests, which in practice means quantitative justification rather than barrier-analysis narratives alone. Permanence requires explicit risk buffers, reversal monitoring, and — for nature-based methodologies — durable monitoring commitments that often exceed historical practice.
Where CAS fits in
CAS supports project proponents and program operators on the operational consequences of the CCP regime rather than the assessment itself. Concretely: (a) gap analyses against the Assessment Framework for projects developed under earlier methodology versions; (b) registry data-model upgrades to surface methodology-version and CCP-status at vintage level; (c) evidence-pack engineering so additionality, permanence, and quantification claims are audit-retrievable per cohort; and (d) retirement-metadata schemas aligned to VCMI and SBTi claim guidance. We are independent of ICVCM and of the assurance bodies performing the assessments.
Sources
[1] ICVCM, 'CCP-Approved Methodologies' (current list).
[2] ICVCM, 'First high-integrity CCP-labelled carbon credits announced', 6 June 2024.
[3] ICVCM, 'Integrity Council approves Adipic Acid and further clean-cookstove methodology versions', 3 June 2025.
[4] Verra, 'ICVCM CCP Label Guidance v1.1'.