> ## Documentation Index
> Fetch the complete documentation index at: https://docs.pfbridge.xyz/llms.txt
> Use this file to discover all available pages before exploring further.

# ProofBridge: Trustless Cross-Chain Asset Transfers

> ProofBridge enables peer-to-peer cross-chain asset transfers using zero-knowledge proofs. No centralized relayers, no custodians — just cryptographic trust.

ProofBridge is a decentralized cross-chain bridge that lets you transfer assets between blockchain networks without trusting any third party. Instead of routing funds through a centralized custodian or validator committee, ProofBridge uses zero-knowledge proofs and direct peer-to-peer matching between liquidity providers (Makers) and bridge users (Bridgers).

<CardGroup cols={2}>
  <Card title="Quick Start" icon="rocket" href="/quickstart">
    Connect your wallet and make your first cross-chain transfer in minutes.
  </Card>

  <Card title="How It Works" icon="circle-info" href="/how-it-works">
    Understand the peer-to-peer bridging model and the role of ZK proofs.
  </Card>

  <Card title="Bridge Tokens" icon="bridge" href="/guides/bridge-tokens">
    Step-by-step guide to bridging tokens across supported networks.
  </Card>

  <Card title="Provide Liquidity" icon="droplet" href="/guides/provide-liquidity">
    Become a Maker and earn fees by providing cross-chain liquidity.
  </Card>

  <Card title="API Reference" icon="code" href="/api/overview">
    Integrate ProofBridge into your application using the REST API.
  </Card>

  <Card title="Supported Networks" icon="network-wired" href="/concepts/supported-networks">
    View all supported chains and available cross-chain routes.
  </Card>
</CardGroup>

## How ProofBridge works

ProofBridge matches Bridgers (users who want to transfer assets) with Makers (liquidity providers) through a marketplace of liquidity advertisements. Settlement is secured by zero-knowledge proofs — neither party needs to trust the other or any intermediary.

<Steps>
  <Step title="Maker posts liquidity">
    A Maker creates a liquidity ad on their source chain, locking tokens they want to provide for cross-chain transfers.
  </Step>

  <Step title="Bridger deposits funds">
    A Bridger selects an ad and deposits the source-chain token on the OrderPortal contract. This creates a cryptographically signed order.
  </Step>

  <Step title="ZK proof is generated">
    The relayer generates a zero-knowledge proof attesting that the deposit exists in the source chain's on-chain Merkle tree — a succinct cross-chain attestation that the destination chain can verify directly.
  </Step>

  <Step title="Both parties receive funds">
    The ZK proof is submitted to both chains simultaneously, releasing the Bridger's destination tokens and the Maker's source tokens trustlessly.
  </Step>
</Steps>

<Note>
  ProofBridge is currently live on **Ethereum Sepolia** and **Stellar Testnet**. Mainnet deployments are on the [roadmap](/reference/roadmap).
</Note>