The world’s leading voluntary carbon market standard.

Verra is a nonprofit standard-setter founded to develop and manage standards for high-integrity environmental and social impact. Its flagship is the Verified Carbon Standard (VCS) Program — the world’s most-used voluntary carbon-crediting framework, established in 2007. VCS-registered projects issue Verified Carbon Units (VCUs), each representing one metric tonne of CO₂-equivalent reduced, avoided, or removed. VCS credits are recognised by CORSIA (the ICAO aviation offsetting mechanism) and have category-by-category eligibility under ICVCM’s Core Carbon Principles for high-integrity buyer markets. Verra also administers the Climate Community and Biodiversity (CCB) Standards, the Sustainable Development Verified Impact Standard (SD VISta), and the Plastic Waste Reduction Standard.

A Lead Assessor is the individual practitioner inside an approved Validation/Verification Body (VVB) who plans, leads, and signs off a validation or verification engagement against Verra’s program rules. Day-to-day work includes: confirming methodology applicability, reviewing the project description and monitoring plan, assessing baseline and additionality, conducting site visits where the methodology requires, evaluating ex-post MRV data, logging findings as Corrective Action Requests (CARs), reviewing the Project Proponent’s response, and drafting and signing the final Validation Report or Verification Statement that Verra reads. Functionally equivalent to a CQI/IRCA Lead Auditor for ISO 14064-3 — both grades describe “the assessor whose name goes on the report.”

Timing and subject. Validation happens before project implementation — the VVB assesses the project description, baseline, additionality, and monitoring plan against VCS methodology requirements. The Validation Report is what Verra reads before registering the project. Verification happens after monitoring data has been collected, typically on a periodic cycle defined in the crediting period. The VVB evaluates the Monitoring Report, replaces ex-ante estimates with ex-post MRV data, and issues the Verification Statement that Verra reads before issuing VCUs. The two-phase structure is the integrity control that distinguishes Verra credits from self-reported reductions — without independent verification, no VCUs are issued.

Different credits, different methodologies, separate registries — but shared governance under Verra. VCS issues Verified Carbon Units for GHG-equivalent reductions. CCB is a multi-benefit label for land-use projects, layered on top of VCS to identify projects with simultaneous climate, community, and biodiversity benefits. SD VISta verifies social and environmental impact mapped to UN SDGs — can be directly certified or applied as a label on top of VCS credits. Plastic Waste Reduction Standard issues Waste Collection Credits and Waste Recycling Credits — entirely separate from carbon, with its own registry. A project is rarely on more than two of these at once; Othello scopes the right combination at engagement letter.

ISO 14064-2 and 14064-3 are the technical floor Verra builds on. The Verra Validation and Verification Manual explicitly references both — ISO 14064-2 for project-level GHG quantification (baselines, monitoring, reporting) and ISO 14064-3 for the validation/verification methodology itself. A VVB Lead Assessor must be competent against both ISO standards as well as Verra-specific Program Guide requirements. This is why Panit holding both Verra Lead Assessor and CQI/IRCA ISO 14064 Lead Auditor is operationally efficient — the technical methodology work and the program-specific work are credentialled in the same practitioner. See /certifications/iso-14064/ for the substantive ISO 14064 detail.

A Validation/Verification Body (VVB) is an organisation that Verra has approved to conduct project assessments under one or more of its programs. To be approved, a VVB must hold ISO 14065 accreditation through a VCS-recognised accreditation body (IAF member operating under ISO/IEC 17029), have signed the required agreement with Verra, have paid the annual VVB fee, and hold accreditation or approval for the sectoral scope(s) of the methodologies it will assess. Verra retains sanction authority — warnings, referrals to the accreditation body, or removal from the approved-VVB list for performance issues. The Lead Assessor is the individual practitioner inside the VVB; the VVB is the organisation Verra has approved to deploy that Lead Assessor against assessments.

Verra’s connections to CORSIA and ICVCM are what make VCU buyers comfortable that the credits they purchase will stay useful as carbon-market integrity standards tighten. CORSIA is the ICAO mechanism by which international airlines offset CO₂ growth above the 2019 baseline; CORSIA-approved crediting programs (VCS is one) issue Eligible Emissions Units airlines can use. ICVCM sets Core Carbon Principles (CCPs) — a quality threshold above which credits earn the CCP label, which high-integrity-buyer markets read. Procurement panels at sophisticated buyers now ask for CORSIA-eligible and / or CCP-labelled VCUs by default. Panit holds Lead Assessor on Verra, the adjacent CORSIA Verifier credential, and the adjacent ICVCM CCP credential — meaning the integrity assessment can be delivered end-to-end by one practitioner.

It depends on the project type, methodology, and Verra’s queue. Typical ranges: validation 3-6 months for standard projects (forestry and REDD+ can extend further given site-visit complexity); verification 2-4 months for projects on a stable monitoring cycle. The binding constraints are usually Project Proponent data availability, methodology-interpretation questions requiring Verra clarification, and Verra’s own registry-review queue after VVB report submission — not the VVB’s calendar. Othello plans both phases ahead; engagement letter issuance is typically within 1 business day of scoping, and project-specific timeline estimates are documented at engagement letter.

By examining the VVB’s project submissions on Verra’s public registry. The Verra Registry (registry.verra.org) lists every project, its VVB, and the submitted validation and verification reports — including the named Lead Assessor on each engagement. Procurement can confirm both that the VVB Othello operates within is on Verra’s approved-VVB list and that Panit has been the named Lead Assessor on submitted reports. The verification chain is direct: Verra is the issuing body, Verra runs the registry, no third-party intermediary required. Othello provides the underlying VVB approval letter and accreditation chain documentation under mutual NDA on request; the Verra Registry is the primary public-facing verification route.

Verra Lead Assessor is the specialist anchor of Othello’s seven-credential ESG-assurance cluster, alongside AA1000AS ACSAP, ISO 14064 Lead Auditor, TGO CFO + CFP Auditor, CORSIA Verifier, ICVCM CCP, and ISCC PLUS — all held by Panit Chancharoonpong. Voluntary carbon markets, regulatory carbon claims, and corporate climate disclosure intersect across these credentials. A project bound for CORSIA airline offsetting can be assessed under Verra + CORSIA by one practitioner; a project bound for high-integrity-buyer markets gets the ICVCM CCP overlay from the same bench. Founded 2020 on US Government bilingual contracts under FAR-grade contractor verification, the firm’s procurement-grade audit-trail standard applies to Verra engagements the same way it applies to ATA-certified translation or 56-1 One Report disclosure. One engagement letter, one NDA from first email, one audit-trail Bangkok-side, twenty credentials behind it. Email [email protected] or call +66 02-859-2145.