Carbon Farming Verification-and-Mint Tool

WHAT IT DOES

Carbon Farming Verification & Mint Tool is a DeFi tool that enables verification of carbon farming projects and minting of carbon credits. It reads the carbon credit contract address, farming project details (location, method, and area), verification report hash, carbon sequestration data, verification criteria, verification status (pending/verified/rejected), minting history, account nonce, gas estimates for verification and mint, and previous verification records. The tool then guides you through submitting a verification report, updating the verification status to verified, minting carbon credits to the project owner, and recording the verification on-chain.

HOW TO USE

Connect your wallet via the built-in connector. Select the network where the carbon credit contract is deployed. Enter the carbon credit contract address, farming project details, verification report hash, carbon sequestration data (in tCO2e), and the payment token address (use address(0) for native token). The tool will read on-chain data and display a preview including: carbon credit contract, project details, verification hash, sequestration data, payment token, verification status, verification criteria, minting history, and estimated gas. Review all details carefully. Click "submit verification & mint" to submit the verification and mint carbon credits. The tool will guide you through three steps: submitting the verification report, updating the status, and minting the credits.

TECHNICAL MECHANISM

The tool uses ethers.js v5.7.2 to interact with the carbon credit contract. It reads project details using `getProjectDetails(projectId)` which returns location, method, and area. Verification status is read via `getVerificationStatus(projectId)` which returns pending/verified/rejected. Verification criteria are read using `getVerificationCriteria()` which returns the required standards (e.g., ISO 14064, VCS). Carbon sequestration data is read via `getSequestrationData(projectId)` which returns the amount of carbon sequestered in tCO2e. Minting history is scanned using `eth_getLogs` for `CreditsMinted` events, with adaptive chunking (halving chunk size on failure) to handle different RPC limits—the tool walks backward from the current block and continues even if some ranges are rejected. The verification transaction calls `submitVerification(projectId, reportHash, sequestrationData)` which updates the status to verified. After verification, the tool calls `mintCredits(projectId, amount)` to mint carbon credits to the project owner. Gas estimates are calculated using `estimateGas` with EIP-1559 fee data from `feeData`. All transactions are built with EIP-1559 fee data, and the tool uses `effectiveGasPrice` from receipts for accurate cost accounting.

WHAT IT CANNOT SEE

This tool cannot verify that carbon sequestration data is accurate—it reads only the submitted data. It cannot detect if farming practices are misrepresented. It cannot guarantee that verification criteria are fair. It cannot prevent front-running of verification. It cannot validate that carbon credits represent real carbon removal—this depends on the verification process. It cannot detect if the carbon credit contract has been modified. It cannot ensure that verification standards are enforced off-chain. It cannot verify that credits are retired properly.

PLEASE NOTE

This tool is EVM-only and supports Ethereum, Polygon, BNB Chain, Arbitrum, Optimism, and Avalanche. Verification and mint transactions are signed by the connected wallet, and the user pays gas fees. Carbon credits represent real environmental assets—ensure verification is conducted properly before minting. The tool does not store or transmit any project data.