> For the complete documentation index, see [llms.txt](https://docs.changeblock.com/changeblock-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.changeblock.com/changeblock-documentation/solutions/environmental-attributes/web3-offsetting.md).

# web3 offsetting

Changeblock offers a range of offsetting services for the web3 ecosystem:

## Historical Transaction Offsetting

By calculating the on chain energy usage of a series of transaction, we can offset the energy a particular wallet or NFT collection has contributed. We do this by calculating the on-chain computation incurred by the transactions, then converting this to energy usage, and finally to tonnes of CO2.

### Future Transaction Offsetting

We can estimate likely future usage based on historical transactions, and 'future-proof' your protocol, wallet or NFT collection for a period of time. We can also provide an on-going attestation-type service that periodically calculates new emissions, and confirms that you are still carbon-negative.

### Carbon-negative Token Wrapping

We provide a token wrapping service (both fungible and non-fungible) tokens that allows you to wrap your NFT or ERC20 (or ERC1155) while offsetting any CO2 generated by its minting and previous transfers. We can also, upon request, include environmentally-positive tokens (CBLKs) that can be accessed by unwrapping the token. This introduces an asset-backed price floor to the wrapped tokens and gives them additional inherent value.