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Verdantry: Carbon credit registry

An on-chain registry that records credit issuance and retirement, making double counting visible and easy to verify.

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Sector
Sustainability
Typical client
Land restoration group issuing verified credits
Typical timeline
24 weeks
Typical team
4 engineers, 1 security reviewer
Carbon credit registry with issuance, retirements and contract status
Project register with verification status, vintage and available credits
Restoration site map with monitoring progress by project

About this project

Carbon markets depend on trust, and double counting has damaged confidence in them. Buyers need proof that the credit they retire is real and can never be sold to anyone else.

Verdantry links each credit to verified project evidence and records its retirement on a public ledger. Corporate buyers use a conventional account and never need a crypto wallet.

Objectives

  • Make every credit traceable to a verified project
  • Prevent the same tonne being sold twice
  • Keep the buying experience simple for non-crypto customers

What’s delivered

  • ERC-1155 credit contracts with retirement logic
  • Verifier workflows and evidence storage
  • Public registry explorer
  • Custodial accounts for corporate buyers
  • Independent smart contract audit

Target outcomes

0

double-count goal

100%

credits linked to evidence

<£0.05

transaction cost target

2

independent reviews planned

Technology

  • Solidity
  • Foundry
  • Polygon
  • The Graph
  • Next.js

Services involved

More work like this

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