# 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. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.changeblock.com/changeblock-documentation/solutions/environmental-attributes/web3-offsetting.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.