CarbonLedger is a public ledger for the world's carbon debt. Scan your shopping, log a journey or an everyday activity, and retire pilot units for the CO₂ it caused, from a single gram. Every retirement gets a receipt that anyone can check on Solana.
Receipt chain intact. Figures refresh from the public audit endpoint when this page can reach it.
The voluntary carbon market moves billions a year, yet buyers still can't be sure that a tonne they paid for was removed, stays removed, and wasn't sold to someone else too.
Credits are issued year by year, but CO₂ stays in the air for centuries. A forest that burns down in thirty years has stored nothing, even though its credits were already used.
The market counts small reductions. Nobody counts the full amount each country has ever emitted, so nobody can say how much is left to clear.
When credits can be traded, re-sold and checked only once in a while, the same tonne gets claimed twice and greenwashing pays. More rules haven't fixed it.
CarbonLedger starts from the total. Each country's historic emissions, from the Global Carbon Project via Our World in Data, become a pool of carbon debt. People and companies clear that debt one gram at a time.
Scan a shopping basket, log a journey or pick an everyday activity. The app estimates the CO₂ in grams.
→Retire those grams as pilot units, credited to a country's pool. Each gram has its own serial number and is retired once, so no gram is used twice.
→You get a receipt chained to every receipt before it. Its fingerprint is written to Solana devnet, where anyone can check it.
→Next, each tonne is linked to a real removal project with published evidence, so you can trace your grams to carbon taken out of the air.
You don't need a crypto wallet or any crypto at all. The system pays every network fee for you.
Scan supermarket barcodes into a basket. Each product gets a CO₂ estimate, and the basket total is ready to retire.
Flights, train rides and car journeys, worked out from distance and mode of transport.
Home electricity and gas from your meter readings, and your meals, retired as you go.
Example amounts are typical rough values for illustration. The app works out your real figure. No payment is taken in the pilot.
Every country has its own pool, sized from its cumulative CO₂ since 1850 (Global Carbon Project, via Our World in Data), scaled to the IPCC's 2,400 billion tonne total. Today each pool is a pilot target.
The plan is to make clearing that debt a shared goal. Members work through the smallest pools first and earn badges and levels others can see, or retire for any country they choose. People and companies can also set their own targets.
Diagram of how the country ladder works. It doesn't show real progress figures.
The registry program enforces these rules. It is deployed on Solana devnet and passes all ten registry test cases. The app does not call it yet: today it anchors receipts by memo.
attested before issuedA named verifier must attest a project before any units are issued from it, and issued can never exceed attested.
serial rangesEvery retirement takes the next block of serial numbers. A gram that has been retired can never be retired again.
one external linkA credit from another registry can be linked to the ledger once only, so the same tonne can't be counted in two places.
contiguous anchorsEach anchored batch of receipts starts exactly where the last one ended, so nothing can be slipped in or left out.
suspend leverIf a project's evidence fails, it can be suspended, and no more units are issued or retired from it.
public by defaultEvery action is readable on standard Solana explorers. Refused retirements stay on the record too.
A permanent record only means something if the carbon removal behind it is permanent too. CarbonLedger plans to back the ledger with a physical removal method and a legal structure that holds the assets for good.
A Liechtenstein foundation (Stiftung) would acquire and hold the land and physical removal assets. By law it couldn't be dissolved, sold or turned to another purpose.
An international operating company would run the ledger, the app and day-to-day partnerships, with a UK company serving UK customers. They would run the service but never own the permanent assets.
Every receipt's fingerprint is written to Solana, today on devnet, a test network. The record stays readable even if the ledger later moves to its own network.
Plant-based material is heated without oxygen, which turns its carbon into a stable solid that lasts for centuries.
The biochar would be made from end-of-line paper that would otherwise go to landfill or be burned. Taking it in would also earn a waste-handling fee.
Each project will have its own ID. Its field video, satellite imagery, batch serial numbers and other evidence will be published under that ID, so every tonne can be followed back.
Everything below is live on the Solana devnet, Solana's free public test network.
Each retirement in the app produces a receipt that is chained to the one before it. The receipt's fingerprint is written to Solana devnet as a memo transaction. Anyone can rerun the chain check at the public audit endpoint.
The registry program, with verifier attestation, serial-range retirement and external-credit links, is deployed and tested. The next build connects the app to it, so retirements are recorded by the program instead of anchored by memo.
Scan, travel and daily retirements of pilot units, with chained receipts anchored on Solana and a public audit trail.
Verifier attestation, serial-range retirement, external-credit links and contiguous anchors, deployed on devnet and tested.
Retirements go through the registry program, with registry control moved to a multisig. A named verifier, card payments and the first biochar removal projects follow.
A dedicated Solana-based network that anyone can read, where CLT is the only token. Partner products will let people earn fractions of a CLT just by using them.
No. Retired units can't be sold, traded or transferred, and they have no market price. A retirement is a record that grams of carbon debt were retired, once. Today they are pilot units, not yet verified credits.
No. The system pays every network fee and handles the blockchain side. You just use the app.
The demo price is £100 per tonne of CO₂, which works out at one penny per 100 grams. You can retire as little as one gram. No payment is taken in the pilot.
Not yet. The live demo runs on Solana devnet, a free public test network, and payments are simulated. The receipts and on-chain anchors are real and can be checked.
Because a public ledger has to show everything. When a retirement is refused, the refusal and its reason are kept in the receipt chain instead of quietly disappearing.
From the Global Carbon Project, via Our World in Data: each country's cumulative CO₂ since 1850, scaled to the IPCC's 2,400 billion tonne total. The source is credited in the app.
Yes. Paste a receipt id into Verify in the app, or download every receipt and rerun the chain check yourself. No account is needed.
Pilot units, not yet verified credits. Recorded on Solana devnet, a test network.