The firmware that validates what enters the registry.
Rimba's methodology framework is the firmware that determines the quality of every credit that enters the registry. In the AACF infrastructure model, the registry is the operating system — but an OS is only as trustworthy as the standards that govern what it processes. That is what the methodology framework does: it defines what counts as a genuine tonne of CO₂ reduced or removed from an ASEAN tropical ecosystem, so that every credit tracked in the CA layer carries scientific credibility that holds up to MAS, NEA, and international audit.
For too long, carbon credit methodologies applied to Southeast Asian forests and peatlands were adapted from frameworks designed for the Amazon, the Congo Basin, or temperate forests — where the ecology, hydrology, and carbon dynamics are fundamentally different. A peatland in Sarawak behaves differently from a peatland in Finland. A mangrove in Johor sequesters carbon in ways a mangrove in Florida does not. These are not minor variations — they determine whether a credit represents a real tonne or an optimistic estimate built on the wrong assumptions.
Rimba co-develops its methodologies with researchers whose published work is rooted in Malaysian and ASEAN field conditions. Every emission factor, allometric equation, and monitoring protocol is calibrated to data collected from the ecosystems being certified — not borrowed from another continent. ISO 14064-2 compliant for project-level accounting. ISO 14064-3 compliant for validation and verification. ICVCM CCP-aligned from the first published version.
The Four Methodology Areas
Tropical Peatland Restoration
Southeast Asia holds approximately 56% of the world's tropical peatland — and Malaysia and Indonesia together account for the majority of that. These ecosystems store carbon that has been accumulating for thousands of years, held in place by a simple mechanism: keep the peat waterlogged and the carbon stays put. Drain it, and it releases.
The Rimba peatland methodology is built around this hydrological reality. The primary measurement variable is water table depth — the single most important indicator of whether a peatland is sequestering or emitting carbon. We measure this continuously through a network of IoT dipwell sensors deployed across the project area, cross-validated against OPTRAM satellite-derived water table proxies derived from Sentinel-1 and Sentinel-2 imagery.
Emission factors are calibrated to Malaysian and Bornean peat conditions, drawing on published field research from Peninsular Malaysia and Sarawak. Baseline deforestation rates are derived from satellite-verified historical land cover change data — conservative by design, transparent by publication.
Mangrove Blue Carbon
Mangroves are among the most carbon-dense ecosystems on Earth, storing carbon not just in their biomass but deep in their sediments — carbon that has been locked away for centuries. Malaysia holds approximately 566,000 hectares of mangrove forest, making it one of ASEAN's most significant blue carbon reserves.
The Rimba mangrove methodology measures three distinct carbon pools: above-ground biomass, below-ground root biomass, and sediment organic carbon. Each pool is measured using field-validated protocols appropriate to the specific mangrove species present — Rhizophora, Avicennia, Bruguiera, and others common to Malaysian coastal ecosystems have different biomass structures and require species-specific allometric equations.
Satellite monitoring using Sentinel-2 optical imagery and ALOS-2 PALSAR radar — which penetrates cloud cover, essential for ASEAN's wet season — tracks canopy extent and health continuously. A permanence buffer pool is built into every mangrove project, set aside as insurance against sea-level rise and storm damage, calibrated to local coastal risk conditions rather than generic global averages.
Tropical Forest — REDD+
Reducing emissions from deforestation and forest degradation — REDD+ — remains one of the most powerful tools available for climate mitigation. Malaysia's dipterocarp rainforests, Sabah's lowland forests, and Sarawak's mixed forest landscapes represent some of the highest carbon-density tropical forest on Earth.
The credibility of any REDD+ methodology lives or dies on the integrity of its baseline — the counterfactual answer to the question: how much forest would have been cleared without this project? Verra's credibility crisis was largely a baseline credibility crisis.
Rimba's approach is deliberately conservative: baselines are derived from satellite-verified historical deforestation rates in a defined reference region, cross-checked against independent datasets including Hansen Global Forest Watch and JAXA forest maps, and reviewed independently before any credits are issued.
Carbon stocks are measured through a combination of field plots — where tree diameter and height are measured and applied to ASEAN-specific allometric equations — and LiDAR or PALSAR satellite data calibrated against those field plots and extrapolated across the project area. A leakage zone is defined and monitored continuously, with automatic deductions applied if deforestation is detected shifting into adjacent unprotected areas.
Smallholder and Palm Oil Transition
This is the methodology that no Western standard has built properly — and it represents one of ASEAN's most significant untapped carbon opportunities.
Millions of smallholder farmers across Malaysia and Indonesia manage palm oil plots of two to five hectares each. Individually, no single farm is large enough to justify the cost of certification under any existing standard. Collectively, their land management decisions — whether they drain peatland, how they apply fertiliser, whether they transition degraded land to other uses — have an enormous cumulative impact on ASEAN's carbon balance.
Rimba's smallholder methodology aggregates hundreds or thousands of farmers into a single registered program, sharing verification costs across the pool. Measurement follows IPCC Tier 2 emission factors — practical and defensible for small-scale land management — combined with GPS-tagged mobile app data collection from farmers themselves and satellite boundary monitoring to detect any land use changes. Credits are pooled and distributed proportionally, making carbon finance accessible to communities that have never had access to it before.
How Verification Works
Every Rimba-certified project goes through two independent processes before any credit is issued. Validation happens before the project begins. An accredited Rimba verifier reviews the project design, the methodology application, the baseline calculation, and the monitoring plan — confirming that the project is correctly structured and that the claimed reductions are plausible given the site conditions.
Verification happens after emission reductions have been achieved. The verifier reviews monitoring data — from IoT sensors, satellite analysis, and field surveys — and confirms that the claimed reductions actually occurred. Only after successful verification does Rimba issue credits into the registry.
Our verifiers are accredited local practitioners — researchers and field scientists based in Malaysia, Indonesia, and Thailand who have direct experience with the ecosystems they audit. They are not flown in from another country. They do not need to be introduced to what a tropical peat swamp looks like. This is not a minor operational detail — it is the reason our verification costs are a fraction of what international auditors charge, and the reason our verification timeline is measured in weeks rather than months.
All verification reports are published openly in the Rimba registry. Every credit carries a serial number traceable to the project, the verification report, and the auditor who signed it. Nothing is hidden.
Scientific Governance — The Methodology Firewall
Rimba's methodology governance is structurally separated from its commercial governance. The Scientific Peer-Review Council (SPRC) — composed of independent researchers from UPM, UNIMAS, UMS, and peer institutions — holds final approval authority over all published Rimba methodologies. The CLG Board retains control over operational and financial decisions. The founder cannot unilaterally approve or block methodology decisions without SPRC consensus. All SPRC votes, dissenting opinions, and methodology rationale documents are published. This governance firewall is benchmarked against the ICVCM's Technical Expert Group model and is in place from the date of CLG incorporation — not after years of operation.
ICVCM Permanence Compliance and Buffer Pools
Rimba's methodologies adopt the ICVCM's February 2026 Continuous Improvement Work Program on Permanence from the first published version. For tropical peatland — the ecosystem most vulnerable to fire and reversal — buffer pools are stress-tested against a 100-year monitoring horizon rather than the legacy 40-year standard. This gives Rimba credits a quality premium over existing Verra credits issued before these standards existed, and positions them as CCP-aligned from inception — directly relevant for Singapore's NEA carbon tax eligibility criteria.
The Science Comes First
No Rimba credit will be issued under any methodology that has not been peer-reviewed and independently published. The four methodology areas described above are in active co-development with identified researchers from UPM, UNIMAS, UMS, and Tanjungpura University. Exclusive co-development agreements are being finalised. The peatland and forest biomass work is most advanced. Mangrove blue carbon and smallholder methodology areas are in structured co-development with named scientific leads.
We are actively seeking additional scientific collaborators — particularly researchers working on tropical peatland hydrology, mangrove sediment carbon, REDD+ baseline methodology, and smallholder emission factor development in ASEAN contexts. If your field data belongs in a methodology that the compliance market will actually use, and if your institution would benefit from being named as a founding scientific partner in the AACF infrastructure, we would genuinely like to hear from you.
Reach us at [email protected]