Methodology

dMRV

dMRV

dMRV

Digital measurement, reporting and verification

Our methodology records every tonne of carbon from the biomass it came from to the place it is stored. Reactor sensors, weighbridges, field apps and accredited laboratories write into one time-stamped chain of custody that buyers and verifiers can audit line by line.

Our methodology records every tonne of carbon from the biomass it came from to the place it is stored. Reactor sensors, weighbridges, field apps and accredited laboratories write into one time-stamped chain of custody that buyers and verifiers can audit line by line.

Illustrative reactor log · R-07 · batch KE-TN-R07-0417
Biochar window 450–700 °C02004006008000h6h12h18h24h612 °C
SELECTED · 00:00 · 30 °C

7 stages

Traced per batch, from biomass to permanence.

15 records

Captured per batch with evidence a verifier can open.

Ex-post

Credits issued after measurement

01 / CHAIN OF CUSTODY

Seven stages. One auditable record.

Seven stages. One auditable record.

Seven stages. One auditable record.

Fifteen records follow every batch from feedstock eligibility to permanence monitoring. Open a stage to see its measurements, capture method and evidence.

Evidence register / 01 Biomass

Feedstock origin and eligibility

Captured through: geotagged source polygon, sourcing category and counterfactual fate, checked against satellite imagery.

Evidence: intake form, source map, eligibility declaration.

Quantity and characteristics

Captured through: integrated weighbridge, with moisture and ash tested at intake.

Evidence: weighbridge ticket, moisture log.

Transport and custody

Captured through: GPS trip log with a signed hand-off at each transfer.

Evidence: trip log, custody signatures.

Carbon accounting

Carbon removal calculator

Example batch · KE-TN-R07-0417

Batch parameters

Calculation breakdown

Biochar stored, dry2.80 t
Organic carbon content78.4%
CO₂ conversion factor (44/12)3.667
Gross carbon stored8.05 tCO₂
Durable fraction0.72
Durable removal5.80 tCO₂
Project emissions & leakage0.58 tCO₂e
Net removal, issued ex-post
Durable removal minus project emissions and leakage
5.22 tCO₂e

Quantification

Removal, computed from the record.

The removal for each batch comes straight from its own measurements. Dry mass, organic carbon and the durable fraction come from the batch's weigh-out and laboratory results, and every emission along the chain, from haulage to reactor power, is deducted before a credit is issued.

The removal for each batch comes straight from its own measurements. Dry mass, organic carbon and the durable fraction come from the batch's weigh-out and laboratory results, and every emission along the chain, from haulage to reactor power, is deducted before a credit is issued.

The durable fraction follows the decay model of the framework the project is registered under, using the measured H/Corg ratio and the conditions of the storage site.

The durable fraction follows the decay model of the framework the project is registered under, using the measured H/Corg ratio and the conditions of the storage site.

Data sources

Every reading is captured at the moment it happens.

Every reading is captured at the moment it happens.

Every reading is captured at the moment it happens.

Most records are written by instruments and devices at the moment they happen. Manual entries are limited, signed and checked against the instruments around them.

Most records are written by instruments and devices at the moment they happen. Manual entries are limited, signed and checked against the instruments around them.

var(--variable-meI8I3Mcr)

Reactor sensors

Reactor sensors

Thermocouples, oxygen and pressure sensors on every reactor, logged every minute and tied to the batch ID.

Thermocouples, oxygen and pressure sensors on every reactor, logged every minute and tied to the batch ID.

var(--variable-meI8I3Mcr)

Weighbridge

Weighbridge

Biomass in and carbon out are weighed on calibrated scales that write directly to the batch record.

Biomass in and carbon out are weighed on calibrated scales that write directly to the batch record.

var(--variable-meI8I3Mcr)

Field app

Field app

GPS-tagged intake, transport and application records with photographs, captured offline and synced on return.

GPS-tagged intake, transport and application records with photographs, captured offline and synced on return.

var(--variable-meI8I3Mcr)

Accredited laboratories

Accredited laboratories

Samples travel under chain of custody to accredited labs; certificates attach to the batch they describe.

Samples travel under chain of custody to accredited labs; certificates attach to the batch they describe.

var(--variable-meI8I3Mcr)

Remote sensing

Remote sensing

Satellite and drone imagery confirm biomass source areas and application sites.

Satellite and drone imagery confirm biomass source areas and application sites.

var(--variable-meI8I3Mcr)

Audit workspace

Audit workspace

Verifiers open raw records, version history and evidence files directly, with every change logged.

Verifiers open raw records, version history and evidence files directly, with every change logged.

Framework alignment

Built for Puro.earth and Isometric.

Our record structure follows the evidence both leading biochar frameworks ask for, so the documents an audit requires already exist when the verifier arrives.

Minimalist concrete building with glowing windows at dusk in fog.
RequirementPuro.earth · Biochar Methodology, Edition 2025Isometric · Biochar Production and Storage ProtocolKari dMRV record
Feedstock eligibilityBiomass sourcing criteriaBiomass feedstock accounting moduleIntake record with sourcing category and counterfactual
Production monitoringFacility audit and production batch recordsBatch records with energy use accountingReactor sensor log and batch balance
Carbon and durabilityOrganic carbon and H/Corg; CORC200+ durability labelMeasured carbon content; durable fraction by storage moduleAccredited laboratory certificate per batch
Project emissionsLife-cycle emissions deductedGHG and energy use accounting modulesMass, energy and transport records
Storage and end usePermitted end uses, traced to applicationStorage modules for soil and the built environmentGPS application log with photographs
IssuanceCORCs on the Puro Registry after an output auditEx-post removal credits on the Isometric registryRegistry serials linked to batch IDs
Portrait of portfolio creator – back view
Portrait of portfolio creator – front view

Integrity

Principles behind every claim.

The methodology is conservative by design. When a measurement is uncertain, the lower figure is used; when evidence is missing, the batch waits.

The methodology is conservative by design. When a measurement is uncertain, the lower figure is used; when evidence is missing, the batch waits.

01

Ex-post only

02

Durable storage only

03

Conservative durability

04

Independent laboratories

05

Tamper-evident records

06

Open to verifiers

01

Ex-post only

02

Durable storage only

03

Conservative durability

04

Independent laboratories

05

Tamper-evident records

06

Open to verifiers

INTEGRITY

Principles behind every claim.

The methodology is conservative by design. When a measurement is uncertain, the lower figure is used; when evidence is missing, the batch waits.

Credits are issued after the carbon has been produced, measured, stored and verified.

Ex-post only

CIRCULAR CARBON / KARI ENERGY

Ex-post only