# Overview

See how Polyester Chain supports your account, assets, and public on-chain activity.

**Polyester Chain** is the EVM-compatible blockchain that supports Polyester accounts and protocol activity. It is built with Cosmos EVM and CometBFT, giving Polyester a dedicated chain for smart accounts, asset movement, account controls, and public contract records.

You interact with Polyester Chain through the Polyester product. **Polyester Scan** is the browser that organizes and displays the Chain's public blocks, transactions, accounts, tokens, and contracts.

## What runs on Polyester Chain

Polyester Chain hosts the contracts and public records behind:

- Safe smart accounts for every Main Account and Subaccount
- Funding Account asset movements
- assets moving into and out of Trading
- Zipper requests and Zipped Asset mints and burns
- internal transfers and withdrawal activity
- destination whitelists and other account controls
- ERC-4337 gas sponsorship.

These contracts give Polyester one shared on-chain layer for account identity, supported asset movement, and public protocol activity.

## How an action reaches the Chain

1. Polyester prepares the supported action for your active smart account.
2. Your owner credential authorizes the action.
3. A bundler submits it through the ERC-4337 infrastructure.
4. The relevant Polyester protocol contract executes the action.
5. CometBFT validators include the result in Polyester Chain's block history.
6. Polyester Scan organizes the public transaction, contract, and event information.

Polyester sponsors gas for current user-facing Chain actions, so you do not need to hold **$P** to use the product.

## Public Chain activity and private trading

Polyester Chain records public activity such as smart-account calls, protocol transactions, contract events, and Zipped Asset supply changes.

Your specific orders, fills, fees, reserved Trading balance, members, permissions, sessions, and complete financial ledger remain private to your account. Spot trades execute through PolyEngine and do not create a separate public Chain transaction for every fill.

> **Public activity does not expose your trading account**
>
> Polyester Scan can show assets entering or leaving your account on-chain. It does not reveal your private Trading balance, open orders, fills, or account-attributed trading history.

## Browse activity with Polyester Scan

Use **[Polyester Scan](https://testnet.polyester.com/docs/user-docs/polyester-scan/overview)** to browse Polyester Chain blocks, transactions, smart accounts, contracts, tokens, transfers, and Zipper flows.

Viewing records and using contract read methods in Polyester Scan do not submit transactions or change contract state.

## Explore Polyester Chain

- **[Smart Account](https://testnet.polyester.com/docs/user-docs/polyester-chain/smart-account)** explains the Safe that represents your Polyester account.
- **[Gas Abstraction](https://testnet.polyester.com/docs/user-docs/polyester-chain/gasless-transactions)** explains how Polyester sponsors Chain gas.
- **[Validators](https://testnet.polyester.com/docs/user-docs/polyester-chain/chain-security)** explains CometBFT consensus and the other approval roles used across Polyester.
- **[RPC Nodes](https://testnet.polyester.com/docs/user-docs/polyester-chain/rpcs)** covers how anyone can run a local node to access and independently check public Chain data.

## FAQ

### What blockchain is Polyester built on?

Polyester runs on Polyester Chain, its own EVM-compatible Layer 1 blockchain purpose-built for exchange infrastructure. Running on a dedicated chain allows Polyester to optimize performance for trading and lending, and sponsor gas fees to reduce costs for users while maintaining a high-performance environment. It also enables Polyester to unify external blockchains and their assets into a single chain through Zipper, bringing cross-chain liquidity together into one coherent trading ecosystem.

### Can I deploy an application or smart contract on Polyester Chain?

During testnet, contract deployment on Polyester Chain is restricted to Polyester’s own protocol and application contracts. Third-party developers cannot deploy their own smart contracts during this phase. You can still build applications and trading integrations that connect to Polyester through its APIs and SDKs.