# Additional Resources Deep dive into **Regen Ledger v4.0 upgrade** with this blog, "[Bringing full eco-credit lifecycles on-chain with Regen Ledger v4.0](https://medium.com/regen-network/bringing-the-full-eco-credit-lifecycle-on-chain-with-regen-ledger-v4-0-183ca96ea7c7)". Explore **Regen Ledger** on its [GitHub](https://github.com/regen-network/regen-ledger/blob/master/README.md). Learn more about the [Nature-Carbon Tonne ](https://docs.toucan.earth/protocol/pool/pool-parties/nct-pool-party-report)the Toucan Bridge will be moving from Polygon to Regen Network's blockchain. --- # 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://guides.regen.network/guides/regen-network/regen-ledger/additional-resources.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.