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Blockchain Carbon Credit Management System

This system leverages blockchain technology to manage the entire lifecycle of carbon credits, from issuance to retirement, ensuring transparency and integrity.

User Interface

Frontend for issuers, verifiers, administrators, and credit holders to interact with the system.

Backend/API Layer

Manages off-chain records and facilitates communication between frontend and external services.

Smart Contract Layer

Core logic engine on an EVM-compatible blockchain, enforcing rules and managing credit states.

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System Architecture Overview

Figure 1 illustrates the integrated architecture, highlighting key components that ensure secure and efficient carbon credit management.

IPFS Metadata Layer

Decentralized storage for heavy datasets like project methodologies and audit reports, minimizing on-chain costs.

Analytics & Indexing Layer

Monitors and indexes smart contract events for real-time dashboards, audit trails, and efficient querying of credit history.

This layered approach ensures data integrity, cost efficiency, and comprehensive traceability throughout the carbon credit lifecycle.

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Carbon Credit Lifecycle: A Sequence of Operations

Figure 2 details the chronological sequence of operations, from user initialization to credit retirement, ensuring a transparent and verifiable process.

Initialization

User connects wallet; system checks permissions against the smart contract's role registry.

Issuance Phase

Authorized Issuer uploads metadata to IPFS, then mints ERC-1155 tokens via smart contract, recording metadata URI on-chain.

Trading Phase

Token holder submits transfer request; smart contract verifies credit activity and executes transfer, updating ownership.

Retirement Phase

Smart contract burns tokens, records retirement reason, and mints a non-transferable Soulbound Token as proof.

Traceability

All events are captured by The Graph, enabling complete, publicly verifiable traceability from creation to consumption.

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Experimental Data & Validation

Our smart contract system has been rigorously deployed and validated across multiple Ethereum-compatible networks, ensuring robust cross-chain compatibility and a network-agnostic architecture.

Ethereum Sepolia Testnet

Chain ID: 11155111

Polygon Amoy Testnet

Chain ID: 80002

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Test Environment & Methodology

Gas consumption and performance metrics were meticulously measured in an EVM-compatible test environment using Hardhat 2.22.0 and Solidity 0.8.20. Contracts were compiled with optimization (200 runs) to mirror production conditions.

Measurement consistency was verified by deployment to the Ethereum Sepolia testnet, confirming identical gas consumption between the test environment and public blockchain infrastructure.

Integrated System

Deployment of CarbonCredit (ERC-1155), RetirementCertificate (Soulbound ERC-721), and CarbonMarketplace contracts.

Major Operations Tested

All key operations defined in the patent claims were executed, with gas consumption recorded from transaction receipts.

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Smart Contract Deployment Costs

CarbonCredit (ERC-1155)

5,031,219

Multi-asset carbon credit token with role-based access control

RetirementCertificate (ERC-721)

2,901,002

Soulbound (non-transferable) retirement proof token

CarbonMarketplace

1,774,092

Decentralized marketplace with reentrancy protection

Total System Deployment

9,706,313

Complete platform infrastructure

The total system deployment cost is 9,706,313 gas, reflecting the complete platform infrastructure.

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Operational Efficiency & Cost Analysis

Carbon Credit Lifecycle Operations

Issue Carbon Credit

293,886

Single Credit Transfer

61,488

Batch Transfer (2 types)

80,568

Retire Credits (with SBT)

432,797

Batch transfer operations reduce gas consumption by 34.5% compared to individual transfers, scaling efficiency for high-volume enterprise use.

Representative Cost Estimates

Issue Credit

293,646

0.004

30.83

Transfer

61,488

0.001

6.46

Retire (SBT)

432,689

0.007

45.43

The platform's network-agnostic architecture allows deployment on any EVM-compatible blockchain, optimizing for cost and speed.

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Soulbound Token (SBT) Retirement & Verification

The retirement operation (432,689 gas) atomically executes several critical sub-operations, ensuring the permanent association of environmental impact claims with the original retiree.

Burn Carbon Credits

Specified quantity of carbon credits are burned, reducing total supply.

Record Retirement Event

The retirement event and its reason are recorded on-chain.

Mint Soulbound Token

A new Soulbound Token (ERC-721) is minted to the retiree's wallet.

Emit Events

Retirement and certificate minting events are emitted for indexing.

The non-transferable nature of the retirement certificate is enforced at the smart contract level, preventing any transfer attempts after initial minting.