> ## Documentation Index > Fetch the complete documentation index at: https://docs.sophon.xyz/llms.txt > Use this file to discover all available pages before exploring further. # Testnet ### Chain Contracts | Name | Address | Comment | | ----------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | BridgeHub Proxy | L1: `0x35a54c8c757806eb6820629bc82d90e056394c92` ([link](https://sepolia.etherscan.io/address/0x35a54c8c757806eb6820629bc82d90e056394c92)) | Acts as a hub for bridges, so that they have a single point of communication with all ZK chain contracts ([reference](https://docs.zksync.io/zk-stack/components/shared-bridges#components-bridgehub)) | | Create2 Factory | L1: `0xce0042b868300000d44a59004da54a005ffdcf9f` ([link](https://sepolia.etherscan.io/address/0xce0042b868300000d44a59004da54a005ffdcf9f)) | CREATE2 factory contract for deterministic address deployment | | Default Upgrade | L1: `0x27a7f18106281fe53d371958e8bc3f833694d24a` ([link](https://sepolia.etherscan.io/address/0x27a7f18106281fe53d371958e8bc3f833694d24a)) | Used to upgrade chain contracts. | | Diamond Proxy | L1: `0xdd02368f378eed3779b358d2020a77e4d022236d` ([link](https://sepolia.etherscan.io/address/0xdd02368f378eed3779b358d2020a77e4d022236d)) | The main contract uses [EIP-2535](https://eips.ethereum.org/EIPS/eip-2535) diamond proxy pattern ([reference](https://docs.zksync.io/build/developer-reference/era-contracts/l1-contracts#diamondproxy)) | | ERC20 Bridge | L1: `0x2ae09702f77a4940621572fbcdae2382d44a2cba` ([link](https://sepolia.etherscan.io/address/0x2ae09702f77a4940621572fbcdae2382d44a2cba))
L2: `0xb10dd9f622ad0192cb007e12d5359081b90273bb` ([link](https://explorer.testnet.sophon.xyz/address/0xb10dd9f622ad0192cb007e12d5359081b90273bb)) | Canonical bridge for ERC20 tokens ([reference](https://docs.zksync.io/zk-stack/components/shared-bridges#main-asset-shared-bridges)) | | Governance | L1: `0x8550bc5b4a16f62a86f7bbd2d89412915c9587e6` ([link](https://sepolia.etherscan.io/address/0x8550bc5b4a16f62a86f7bbd2d89412915c9587e6)) | Deployer and Admin multi-sig for ZK chains | | Shared Bridge | L1: `0x3e8b2fe58675126ed30d0d12dea2a9bda72d18ae` ([link](https://sepolia.etherscan.io/address/0x3e8b2fe58675126ed30d0d12dea2a9bda72d18ae))
L2: `0xb10dd9f622ad0192cb007e12d5359081b90273bb` ([link](https://explorer.testnet.sophon.xyz/address/0xb10dd9f622ad0192cb007e12d5359081b90273bb)) | Bridges assets between L1 and hyperchains, supporting both ETH and ERC20 tokens ([reference](https://docs.zksync.io/zk-stack/components/shared-bridges)) | | State Transition Proxy | L1: `0x4e39e90746a9ee410a8ce173c7b96d3afed444a5` ([link](https://sepolia.etherscan.io/address/0x4e39e90746a9ee410a8ce173c7b96d3afed444a5)) | Acts as a connector between Ethereum (L1) and ZK Chain (L2) ([reference](https://docs.zksync.io/build/developer-reference/era-contracts/l1-contracts#diamond-also-mentioned-as-state-transition-contract)) | | Transparent Proxy Admin | L1: `0x0358baca94dcd7931b7ba7aaf8a5ac6090e143a5` ([link](https://sepolia.etherscan.io/address/0x0358baca94dcd7931b7ba7aaf8a5ac6090e143a5)) | Admin Contract for the Transparent Proxy | | Validator Timelock | L1: `0xd3876643180a79d0a56d0900c060528395f34453` ([link](https://sepolia.etherscan.io/address/0xd3876643180a79d0a56d0900c060528395f34453)) | An intermediate smart contract between the validator EOA account and the ZKsync smart contract ([reference](https://docs.zksync.io/build/developer-reference/era-contracts/l1-contracts#validatortimelock)) | | Verifier | L1: `0xac3a2dc46cea843f0a9d6554f8804aed18ff0795` ([link](https://sepolia.etherscan.io/address/0xac3a2dc46cea843f0a9d6554f8804aed18ff0795)) | ZK proof verifier contract | ### Useful Contracts | Name | Address | Comment | | ----------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------ | | Sophon Global Paymaster | L2: `0x98546B226dbbA8230cf620635a1e4ab01F6A99B2` ([link](https://explorer.testnet.sophon.xyz/address/0x98546B226dbbA8230cf620635a1e4ab01F6A99B2)) | Sponsors all transactions | | SOPH | `0x000000000000000000000000000000000000800A` ([link](https://explorer.testnet.sophon.xyz/address/0x000000000000000000000000000000000000800A)) | Native SOPH token | | WSOPH | `0x9B7EA63EF5062661570afe548e3AD691D5652527` ([link](https://explorer.testnet.sophon.xyz/address/0x9B7EA63EF5062661570afe548e3AD691D5652527)) | Wrapped SOPH | | Bridged USDC | L2: `0x27553b610304b6AB77855a963f8208443D773E60` ([link](https://explorer.testnet.sophon.xyz/address/0x27553b610304b6AB77855a963f8208443D773E60))
L2 Custom Bridge: `0x72591d4135B712861d8d4513a2f6860Ac30A684D` ([link](https://explorer.testnet.sophon.xyz/address/0x72591d4135B712861d8d4513a2f6860Ac30A684D))
L1: `0xbf4fdf7bf4014ea78c0a07259fbc4315cb10d94e` ([link](https://sepolia.etherscan.io/address/0xbf4fdf7bf4014ea78c0a07259fbc4315cb10d94e)) | Main USDC contract - Follows Circle standard | | Multicall | `0x83c04d112adedA2C6D9037bb6ecb42E7f0b108Af` ([link](https://explorer.testnet.sophon.xyz/address/0x83c04d112adedA2C6D9037bb6ecb42E7f0b108Af)) | Enables more efficient contract querying: [https://github.com/mds1/multicall](https://github.com/mds1/multicall) | | Disperse | `0x7853Fa386191EF961e6448dEBE4C3E205F7A4215` ([link](https://explorer.testnet.sophon.xyz/address/0x7853Fa386191EF961e6448dEBE4C3E205F7A4215)) | Enables batch transfers for tokens and SOPH : [https://github.com/sophon-org/disperse](https://github.com/sophon-org/disperse) | | Permit2 | `0x37CcE35d6A19C3948e9557308E705Ee64404B3D0` ([link](https://explorer.testnet.sophon.xyz/address/0x37CcE35d6A19C3948e9557308E705Ee64404B3D0)) | Makes token approvals easier and more secure: [https://github.com/Uniswap/permit2](https://github.com/Uniswap/permit2) | | TimestampAsserter | `0x3070e0Ff401098d250D78D4aeAF6fC85C6bD29ff` ([link](https://explorer.testnet.sophon.xyz/address/0x3070e0Ff401098d250D78D4aeAF6fC85C6bD29ff)) | Verifies if the current block timestamp falls within a specified range | | LzOftHelper | `0x88172F3041Bd0787520dbc9Bd33D3d48e1fb46dc` ([link](https://explorer.testnet.sophon.xyz/address/0x88172F3041Bd0787520dbc9Bd33D3d48e1fb46dc)) | LayerZero OFT Helper contract - See [LayerZero Integration](/build/tokens/layerzero_integration) | | Seaport 1.6 | `0x18f4D8BbEE9F8783E17B7f2F3Cc18c9Be346ba44` ([link](https://explorer.testnet.sophon.xyz/address/0x18f4D8BbEE9F8783E17B7f2F3Cc18c9Be346ba44)) | OpenSea's marketplace protocol for safely and efficiently buying and selling NFTs | | Conduit Controller | `0x0E5267441f3dC4BEC3bbC7f0e6588239c76C1B75` ([link](https://explorer.testnet.sophon.xyz/address/0x0E5267441f3dC4BEC3bbC7f0e6588239c76C1B75)) | Protocol component for Seaport that manages token transfers |