> For the complete documentation index, see [llms.txt](https://guides.regen.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://guides.regen.network/guides/regen-network/regen-ledger/about.md).

# 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.&#x20;

### 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.&#x20;

### 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.&#x20;

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.&#x20;