# About Regen Ledger is a public [delegated Proof-of-Stake (dPoS)](/guides/cosmos-ecosystem/blockchain-basics/glossary-of-terms.md#delegated-proof-of-stake) blockchain application built with [Cosmos SDK](https://docs.cosmos.network/). Regen Ledger provides the blockchain infrastructure for ecological assets and the verification of claims. ## The Evolution of Regen Ledger Since its initially launch on April 15, 2021, Regen Ledger has three major upgrades, each adding features necessary to achieve the goals of Regen Network. ### v2.0 - Ecocredit Module Regen Ledger v2.0 added the **Ecocredit Module**. This enabled the creation and management of credit types, credit classes and projects, as well as the issuance, transferring and retirement of ecosystem service credits (i.e. carbon credits, biodiversity credits, soil health credits, etc.). ### v3.0 - Basket Submodule Regen Ledger v3.0 introduced the **Basket Submodule** to the existing Ecocredit Module. Ecocredits are *non-fungible*, meaning they are unique in value and cannot be traded one-to-one. However, these credits can be added to a virtual basket in exchange for *fungible* tokens. These fungible tokens can be bought, sold and pooled on a centralized or decentralized exchange. At anytime, tokens may be returned to the basket and exchanged for their value in the existing ecocredits. ### v4.0 - Marketplace Submodule & Data Module [Regen Ledger v4.0 ](https://medium.com/regen-network/bringing-the-full-eco-credit-lifecycle-on-chain-with-regen-ledger-v4-0-183ca96ea7c7)added the **Marketplace Submodule** to the existing Ecocredit Module. This submodule added the functionality for buying and selling ecocredits directly in an on-chain marketplace. The most recent upgrade to Regen Ledger also added the **Data Module**. While the Ecocredit Module enables the creation and management of credit classes, projects and credit batches, the Data Module provides the verifiable supporting data for them. v4.0 also added functionality to support a coming bridge that will be used to bridge ecocredits to/from the Polygon Blockchain. This will play a key role in funding initial token baskets. --- # 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/about.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.