> ## 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.

# Introduction

> ProofBridge v2 — peer-to-peer bridging authorized by both traders' BLS signatures and settled against zero-knowledge deposit proofs

ProofBridge is a peer-to-peer cross-chain bridge. Two counterparties trade
directly — a **maker** (liquidity provider) and a **bridger** — and each
side's funds are escrowed in a contract on its own chain. The flow is
chain-agnostic; today it runs live on Stellar Testnet and Ethereum Sepolia.

What makes v2 different is who authorizes settlement:

* **The two traders are the authorization.** Every trade is signed by both
  parties with BLS settlement keys. The two signatures are combined into
  one, and the contracts on each chain verify that combined signature
  directly against an on-chain key registry. No trade requires
  ProofBridge's permission.
* **Deposits are proven, not trusted.** An unlock on one chain carries a
  zero-knowledge proof that the counterparty's deposit really is recorded
  in the *other* chain's Merkle tree. The destination chain can't read the
  source chain — the proof carries that fact across.

The relayer that used to approve trades is now a coordinator: it collects
the two signatures, aggregates them, generates the deposit proofs, and
submits the unlock transactions. It holds no funds and grants no
approvals — any honest party could run the same code.

<Note>
  You're reading the **v2** docs, which describe the BLS-authorized flow live
  on Stellar Testnet and Ethereum Sepolia. The pre-BLS design is preserved
  under **v1 (pre-BLS)** in the version picker.
</Note>

## What you can do

<CardGroup cols={2}>
  <Card title="Bridge assets" icon="arrow-right-arrow-left">
    Move tokens from one chain to another. Connect a wallet, set up your
    settlement key once, and trade — no sign-up, no KYC.
  </Card>

  <Card title="Provide liquidity" icon="droplet">
    Post a liquidity ad and earn the spread whenever a bridger settles
    against it. Run the market-maker bot and it happens hands-free.
  </Card>
</CardGroup>

## Where to go next

* [How it works](/v2/how-it-works) — the full trade lifecycle in one page
* [Quickstart](/v2/quickstart) — bridge your first tokens, including the
  one-time key registration
* [Settlement keys](/v2/concepts/settlement-keys) — the per-wallet BLS key
  every trader registers once
* [Smart contracts](/v2/reference/smart-contracts) — live testnet addresses