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

# cirBTC contract addresses

> Smart contract addresses for cirBTC (Circle Wrapped Bitcoin) on supported mainnet and testnet blockchains.

cirBTC tokens are controlled by a smart contract on the blockchain. The
following sections list the cirBTC smart contract addresses on every supported
mainnet and testnet blockchain.

## Mainnet

<Warning>
  **Mainnet tokens have financial value**

  The blockchains listed below store and transfer tokens that have real financial
  value. When interacting with mainnet blockchains, you should thoroughly test
  your code, verify all addresses, and ensure the privacy of seed phrases and
  private keys.
</Warning>

| Blockchain | cirBTC Mainnet Address                                                                                                |
| :--------- | :-------------------------------------------------------------------------------------------------------------------- |
| Ethereum   | [`0x72DFB2E44f59C5AD2bAFE84314E5b99a7cd5075E`](https://etherscan.io/token/0x72dfb2e44f59c5ad2bafe84314e5b99a7cd5075e) |

## Testnet

<Warning>
  **Testnet tokens have no financial value**

  Because the testnets listed below are used only for testing, the cirBTC tokens
  in circulation on these networks have no financial value, and **are not backed
  by real Bitcoin**.

  Similarly, native testnet tokens have no financial value.
</Warning>

| Blockchain       | Token Address                                                                                                                   |
| ---------------- | ------------------------------------------------------------------------------------------------------------------------------- |
| Arc Testnet      | [`0xf0C4a4CE82A5746AbAAd9425360Ab04fbBA432BF`](https://testnet.arcscan.app/address/0xf0C4a4CE82A5746AbAAd9425360Ab04fbBA432BF)  |
| Ethereum Sepolia | [`0x3a3fe695F684Bf9b9e43CF43C2b895Ea5e392bB3`](https://sepolia.etherscan.io/address/0x3a3fe695F684Bf9b9e43CF43C2b895Ea5e392bB3) |