Puro.earth, Isometric or Verra: which suits a biochar project?

All three take biochar projects from India. Isometric's Biochar Protocol v1.0 and Verra's VM0044 v1.2 were approved for the ICVCM CCP label in August 2025; Puro.earth, which wrote the first biochar methodology, is a CCP-Eligible programme. Pick by which buyers you are selling to, how your kilns run and how often you need issuance.

Puro.earth

• Credit: the CORC, one tonne of durable net removal, issued after verification.
• Methodology: Puro Biochar, Edition 2025, version 2. Biochar is labelled 200+ years.
• Audits: a facility audit by an independent VVB, valid up to five years, then an output audit per reporting period. Puro.earth pays the auditors.
• Credits are sold to buyers directly, through marketplaces or through brokers.

Isometric

• Credit: one certificate per tonne, issued per production batch on a public registry with the data behind it.
• Protocol: Biochar Production and Storage, whose v1.0 is CCP-approved. Modules cover industrial plants, distributed production, mobile reactors and combustion co-products.
• Durability: soil storage credited at 200 years, or 1,000 years with extra testing.
• Steps: eligibility check, 10-day public comment, validation with a site visit, batch verification, issuance. Isometric picks the verifier, and buyers pay for certification, not project developers.

Verra VM0044 v1.2

• Credit: VCUs on the Verra Registry, where anyone can open an account.
• CCP-approved since August 2025. Additionality now includes an investment analysis under VT0008.
• Registration follows Verra's pipeline listing, 30-day public comment, validation and verification, then the issuance levy.

How to choose

• Selling to a buyer who names a registry: use that one.
• Many small kilns across villages: check Isometric's distributed production module and how each registry treats open kilns.
• Need frequent cash: Isometric issues per batch; Puro offers on-demand issuance through Puro Issuance Plus for eligible industrial suppliers.
• Want the CCP label now: Isometric v1.0 and VM0044 v1.2 were approved on 13 August 2025. Check ICVCM's assessment status for later decisions on Puro's methodology.

What Senseible does here

Senseible records each batch the same way whichever registry you pick: kiln sensor temperature logs, chain of custody, geotagged photos and H:Corg results, with automatic flags, in one verifier evidence pack. The chosen registry and its verifier make the call.

• Carbon removal projects
• What a CORC is
• The Isometric registry
• VM0044 v1.2 investment analysis
• Carbon credit platforms

Sources: Puro.earth, Certification: certification journey from initial qualification to CORC issuance, Isometric, Biochar pathway: Biochar Protocol v1.0, modules and five certification steps, Verra, VM0044 Biochar Utilization in Soil and Non-Soil Applications, v1.2 (active since 27 June 2025), methodology page, ICVCM, Integrity Council approves Biochar and Improved Forest Management methodologies (13 August 2025), Verra, Registration and Issuance Process, v5.0 (16 December 2025)

Last reviewed 2026-11-02.