Greentruth Marketplace: The Single Venue for the QET Lifecycle

For natural gas and RNG producers ready to mint verified tokens from primary MRV data, and for corporate, utility, and fleet buyers ready to anchor reporting claims to registry-grade environmental attributes, the Greentruth Marketplace is the single venue where the full Quantified Emissions Token lifecycle plays out. Mint. Discover. Acquire. Retire. Every step on one registry, anchored on the EarnDLT blockchain infrastructure running on Hedera Hashgraph, with the same verified attribute schema flowing through every transaction. If you are a producer, you mint here. If you are a buyer, you acquire and retire here. The QET marketplace is the place both sides come to meet.

The Greentruth Marketplace, in one paragraph. The Greentruth Marketplace is the single venue for the full Quantified Emissions Token (QET) lifecycle — minting, discovery, acquisition, and retirement — anchored on the EarnDLT blockchain registry on Hedera Hashgraph. It serves both sides of the market: producers minting verified tokens from primary MRV data under ISO 14064-3 reasonable assurance, and corporate, utility, fleet, and industrial buyers discovering inventory across QET-NG, QET-RNG, QET-CCS, and QET-ELEC, acquiring tokens that match their procurement criteria, and retiring them against specific reporting claims under GHG Protocol, SBTi, CSRD, IFRS S2, SB 253, TCR, LCFS, and EU Methane Regulation frameworks.

What a QET is in the first place

The Greentruth Marketplace is the operating venue for the Quantified Emissions Token market. It sits on top of the EarnDLT registry — the blockchain infrastructure on Hedera Hashgraph that mints, transfers, and retires the underlying tokens — and surfaces every lifecycle operation through a unified application and API layer. Producers see one side of the venue; buyers see the other; both sides operate on the same registry, with the same attribute schema, against the same inventory.

Three properties define the venue:

• It is single-registry. Every QET on the platform is minted on, transferred on, and retired on the same EarnDLT registry. There is no fragmentation across competing chains, no opaque off-chain inventory — the registry is the book of record, and the application layer is the queryable surface on top of it.
• It is full-lifecycle. Mint → Discover → Acquire → Retire is not four products bolted together; it is one continuous workflow with consistent attribution, consistent verification, consistent compliance treatment, and consistent export. A buyer retiring a token today is consuming the same attribute structure the producer minted with months earlier.
• It is cross-token. A single queryable inventory surfaces QET-NG (natural gas), QET-RNG (renewable natural gas), QET-CCS (geologically stored CO₂), and QET-ELEC (electricity attribute) side by side. Cross-token procurement — for example, a hyperscaler matching natural-gas procurement against electricity-attribute procurement on the same disclosure cycle — operates through one interface.

For the technology backbone of every QET

For natural gas producers, RNG facilities, carbon-storage operators, and renewable electricity programs, the Marketplace is where verified primary data becomes a registry-grade, tradeable certificate.

The producer side of the workflow:

• Onboard. Producers complete KYC and entity verification under the EarnDLT Platform and Greentruth Marketplace Governance Framework Section 6.1.7 procedures. Project registration follows, with environmental-attribute rights documentation, monitoring system specifications, and the applicable program schedule attached.
• Submit primary MRV data. Site-specific measurement, continuous monitoring, segment-level reporting (where applicable to the QET class), and the underlying data-quality hierarchy feed into the methodology. For natural gas, that's the QET-NG methodology; for RNG, QET-RNG; for CCS, QET-CCS; for renewable electricity, QET-ELEC.
• Verification by an accredited third party. An ISO 14065:2020 accredited verifier reviews the producer data under ISO 14064-3 reasonable assurance, issues an unmodified opinion meeting the program's materiality threshold, and signs off on the token issuance.
• Mint on-chain. The token is minted on the EarnDLT registry with the verified attributes attached: producer-level carbon intensity, methodology version, verifier of record, MRV tier, geography, vintage, and the full data trail. Once minted, the token enters the Marketplace inventory available for discovery.

For producers, the value of operating here is that the same token a verifier signed off on is the same token a buyer eventually retires — with full provenance preserved on-chain throughout. There is no re-issuance, no re-statement, no platform-side modification of the producer's verified data.

How minting works in detail

For the QET-NG product

For the QET-RNG product

For corporate procurement teams, utilities, data centers, fleet operators, industrial offtakers, and aggregators, this is where reporting claims are anchored to specific verified attributes — not to a general-purpose voluntary attestation but to a registry-grade token with full chain of custody.

The buyer side of the workflow:

• Discover. Search the live inventory by basin, operator, pipeline, methodology version, MRV tier, regulatory eligibility (LCFS, EU Methane Regulation, GHG Protocol Scope 2 market-based), vintage, certificate class, and physical pathway. Save searches, build watchlists, and run cross-token portfolio queries.
• Acquire. Place an order or execute a bilateral transaction. Settlement is processed through the platform's payment and escrow layer; the token transfers on-chain to the buyer's wallet with an immutable transfer record.
• Retire. When the buyer is ready to anchor the token to a specific reporting claim, retirement is irrevocable on-chain. The retirement record carries the framework-aligned export — GHG Protocol Scope 1/2/3, SBTi, CSRD ESRS E1, IFRS S2, SB 253, TCR GRP — that the buyer's ESG software or disclosure team consumes directly.

For buyers, the value is twofold. First, every QET available is a registry-grade attribute with ISO 14064-3 reasonable-assurance backing — not a voluntary attestation that an auditor in 2026 or 2027 might reject. Second, every retirement produces a single immutable record that flows through to disclosure without manual reconciliation, ad-hoc retrieval, or PDF-stitching.

How discovery works in detail

How acquisition works

How retirement works

The platform is organized around four parallel lifecycle stages. The same authentication, the same attribute schema, and the same versioning apply across all four — but each stage has a dedicated workflow, dedicated documentation, and a dedicated audience.

Mint. Producers (or Measurement Partners acting on their behalf) submit primary data, run the methodology, secure ISO 14064-3 reasonable-assurance verification, and issue the token on-chain. Mint events stream to integrated buyer-side platforms via the Machine-Ready API; buyer saved searches matching the new token surface automatically.

Discover. Buyers search the live inventory across all token classes and all attribute dimensions. The pipeline pathway layer surfaces for natural gas and RNG queries; the hourly-granularity attribute structure surfaces for QET-ELEC; the permanence and storage-pathway attributes surface for QET-CCS.

Acquire. Order placement, settlement, on-chain transfer. The token lands in the buyer's wallet with a full transfer record on the Hedera ledger.

Retire. Retirement against a specific buyer claim. The retirement is irrevocable on-chain; the framework-aligned export is produced; the disclosure platform consumes it.

The four stages connect end-to-end. A producer mints; a buyer discovers; the buyer acquires; the buyer retires. Every stage is anchored to the same registry, the same attribute schema, and the same chain of custody — which is the property that lets an auditor or regulator open a retirement record three years later and trace it back, segment by segment, to the producer's primary MRV data.

The phrase "registry-grade" matters because the disclosure environment has changed. The major reporting frameworks — GHG Protocol, SBTi, CDP, TCR, CSRD ESRS E1, IFRS S2 — have steadily raised the evidentiary bar for what counts as a valid environmental-attribute instrument. Voluntary attestations, spreadsheet records, and producer-direct PDFs that survived audits in earlier cycles are no longer surviving 2026 audits.

Three properties make a QET registry-grade on the Greentruth Marketplace:

• ISO 14064-3 reasonable assurance. Every QET is verified by an accredited ISO 14065:2020 verifier under reasonable-assurance procedures — the higher of the two ISO 14064-3 assurance levels — with materiality thresholds documented and an unmodified opinion attached to the on-chain record.
• Single-mint enforcement at the registry layer. A specific physical unit produces exactly one token. The Hedera-anchored registry structurally rejects any attempt to issue a second token for the same MMBtu, MWh, or tonne. Double-counting prevention is enforced at the infrastructure layer, not asserted at the policy layer.
• Irrevocable on-chain retirement. Once retired, a QET cannot be re-retired, re-used, or rolled forward. The retirement record is a permanent state change written to the Hedera ledger and retained for the seven-year minimum the Framework requires.

These properties are why a Greentruth Marketplace retirement record stands up under audit. The integrity is structural, not contractual.

How ISO 14064-3 underpins this

Read the full Governance Framework

A corporate buyer in 2026 is rarely procuring a single attribute class. The same hyperscaler that procures hourly-matched renewable electricity is also procuring natural gas for backup generation, RNG for thermal load, and increasingly looking at carbon-storage allocations to balance residual emissions. The procurement teams behind those programs need to operate across the full attribute portfolio, not bounce between four siloed registries.

The platform surfaces all four QET classes in a single queryable inventory:

• QET-NG — natural gas with verified producer-level methane intensity, optional Physical Flow Certificate for EU Methane Regulation chain-of-custody, basin-level or well-level pathway origin.
• QET-RNG — renewable natural gas with the Compliance Passport five-point physical-delivery verification, Fuel Attribute Documentation Certificate for Scope 1 fossil CO₂ reduction validity.
• QET-CCS — geologically stored CO₂ with verified storage pathway and permanence attributes structured to satisfy major public CCS-EAC frameworks.
• QET-ELEC — renewable electricity with hourly-granularity attribution and machine-readable export structured for the consumption patterns major corporate procurement programs use.

Cross-token procurement queries — for example, "show me QET-NG with Haynesville origin OR QET-RNG with anaerobic-digestion pathway, deliverable to the Gulf Coast, vintage 2025–2026" — execute against the unified inventory. Watchlists, saved searches, and webhook subscriptions span the four classes.

QET-NG · QET-RNG · QET-CCS · QET-ELEC

Every Marketplace operation is exposed through the Machine-Ready API and data product layer. For developers, ERP integrators, ESG-software engineers, and customer technical teams, that means:

• REST endpoints covering every lifecycle stage: mint, discover, acquire, retire.
• Webhook events on every QET state change — mint events, transfer events, retirement events, methodology-version events.
• Schema-first attribute model with versioned, JSON-machine-readable fields and DID-compliant identifiers.
• Framework-aligned exports at retirement — GHG Protocol, SBTi, CSRD ESRS E1, IFRS S2, SB 253, TCR, LCFS — produced as machine-readable payloads consumable by the buyer's ESG software (Watershed, Persefoni, Sweep, Workiva, or in-house GHG accounting systems).

The integration model is additive. The Marketplace works as a user-facing application for procurement teams that want a UI, and as an API for engineering teams that want to embed QET operations inside an existing workflow. Most enterprise customers run both modes in parallel.

The full Machine-Ready API surface

The Marketplace is not a niche voluntary venue. Every token on it is structured for utility in the regulatory and disclosure environments customers actually operate in.

EU Methane Regulation. QET-NG with appended Physical Flow Certificate produces the Article 28 chain-of-custody evidence importers and downstream consumers face from the methane-intensity threshold onward.

GHG Protocol. QET retirements produce the Scope 1, Scope 2, and Scope 3 Category 3 disclosures the protocol contemplates, with biogenic CO₂ from RNG combustion reported outside Scope 1 per the protocol's separate reporting requirement.

SBTi. QET-RNG Fuel Attribute Documentation Certificates support Scope 1 fossil CO₂ reduction under Criterion C11 biogenic exclusion; QET-NG Physical Flow QETs support SBTi physical trace-and-claim attribution in Scope 3 energy-supply disclosures.

LCFS. Producers operating in California can mint QETs structured to satisfy LCFS pathway integrity requirements; buyers can acquire LCFS-eligible inventory through the same Marketplace surface.

CSRD ESRS E1 and IFRS S2. Retirement records produce the machine-readable disclosure payload these frameworks require, with the underlying verification opinion anchored to the on-chain record.

SB 253 and TCR GRP. California's SB 253 ($1B revenue threshold) and TCR's General Reporting Protocol both accept QET-backed disclosures with the retirement record serving as the supporting evidence.

For the cross-framework alignment in detail