> For the complete documentation index, see [llms.txt](https://lightec.gitbook.io/lightecxyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://lightec.gitbook.io/lightecxyz/zkbtc-bridge/whats-usdzkbtc.md).

# What's $zkBTC?

### What is $zkBTC?

$zkBTC is an innovative ERC-20 token that represents Bitcoin on the Ethereum blockchain, **backed 1:1 with Bitcoin.** 

zkBTC aims to bring Bitcoin's reliability and market strength to Ethereum’s versatile DeFi ecosystem, making it easier for users to participate in Ethereum-based decentralized finance while still holding an asset tied to Bitcoin’s value.

### Key Features of $zkBTC

1. **Fully Decentralization**: zkBTC is powered by a decentralized cross-chain bridge built with zero-knowledge proof (ZKP) technology. This bridge ensures secure and trustless transactions between Bitcoin and Ethereum.
2. **1:1 Backed**:Each zkBTC token is minted through a cross-chain process and is guaranteed by a corresponding real Bitcoin, providing security and stability for all holders. 
3. **Interoperability**: zkBTC provides users with a seamless way to utilize Bitcoin on Ethereum, enabling BTC holders to explore DeFi without selling their bitcoin assets.
4. **Security**: The security provided by cryptography and Zero-Knowledge Proofs (ZKPs) guarantees a 1:1 peg, effectively eliminating the risk of depegging and greatly enhancing overall security.