CBlock
Turning Carbon Credits into Digital Trust
Created on 14th August 2025
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CBlock
Turning Carbon Credits into Digital Trust
The problem CBlock solves
In 2024, energy-related carbon dioxide emissions hit a record high, reaching 37.8
gigatonnes (Gt CO₂) and continue to rise. Carbon emissions have reached
unprecedented levels, demanding urgent action toward climate neutrality. However,
current carbon credit markets suffer from lack of transparency, double counting,
and slow manual verification processes. These inefficiencies lead to reduced trust
and discourage participation from businesses and individuals. The absence of
engaging incentives further limits widespread adoption of carbon offset programs.
Challenges we ran into
While building CBlock, we faced several challenges. One major hurdle was enabling smooth interoperability between the
Marketplace
andCarbonCredit
contracts, as initial permission restrictions prevented the marketplace from burning credits during retirement. We resolved this by granting approval viasetApprovalForAll
before initiating the burn, allowing seamless interaction between ERC-1155 and ERC-721 contracts. Another challenge was the delay in retrieving project metadata from IPFS, which we overcame by optimizing the JSON structure and implementing lazy loading to improve frontend performance. We also encountered MetaMask connectivity issues on the Sepolia testnet, which were fixed by resetting the wallet and re-adding the network details from Alchemy. Finally, managing the dual-token model introduced data syncing complexities, which we addressed by using ERC-1155 events to trigger certificate minting in the ERC-721 contract, ensuring accurate and verifiable linkage.Tracks Applied (1)
Ethereum Track
ETHIndia
Technologies used