SuperchainERC20

SuperchainERC20 is an implementation of ERC-7802 (opens in a new tab) designed to enable asset interoperability in the Superchain. Asset interoperability allows for tokens to securely move across chains without asset wrapping or liquidity pools for maximal capital efficiency, thus unifying liquidity and simplifying the user experience.

Additional features:

• Simplified deployments: 0-infrastructure cost to make your token cross-chain. Provides a consistent, unified implementation for tokens across all Superchain-compatible networks and a common cross-chain interface for the EVM ecosystem at large.
• Permissionless propagation: Easily clone an existing token contract to a new OP Stack chain using create2 without requiring the original owner, which enables movement of assets to the new chain once Interop goes live. Importantly, permissionless propagation retains the integrity of the original owner on the contract and preserves security but proliferates the contract's availability to new chains.
• Common standard: Implements ERC-7802, a unified interface that can be used across all of Ethereum to enable cross-chain mint/burn functionality.

How it works

SuperchainERC20 facilitates secure token transfers between chains in the Superchain networks via native burning and minting.

• Token Burning: Initiating message where token is burned on the source chain. A user initiates a transfer of token from one blockchain to another and specifies the recipient wallet address on the destination chain. A specified amount of token is burned on the source chain.
• Token Minting: Executing message where token is minted on the destination chain. The specified amount of token is minted on the destination chain directly to the recipient wallet address.

An important thing to note is using crosschainBurn and crosschainMint on the SuperchainERC20 to move your asset across the Superchain only affects which chain your asset is located on and does not change the overall supply of the token. This keeps the token's total amount the same across all networks, ensuring its value stays stable during the move and that the SuperchainERC20 retains a unified, global supply count.

This diagram illustrates the process where tokens are burned on the source chain and minted on the destination chain, enabling seamless cross-chain transfers without the need for asset wrapping or liquidity pools.

Major components

• Token Contract: implements SuperchainERC20 with bridging functionality.
• Factory Predeploy: uses a create2-based factory for deploying SuperchainERC20 tokens consistently across chains.
• Bridging Functions: using methods like sendERC20 and relayERC20 for cross-chain transfers.

Comparison to other token implementations

SuperchainERC20 differs from other token implementations in its focus and implementation:

• SuperchainERC20 implements ERC-7802, which provides a minimal crosschain mint/burn interface designed to be a common pattern for the EVM ecosystem.
• SuperchainERC20 shares trust assumptions across all chains in the Superchain, such that custom assumptions around security and latency are not required to account for when executing transfers.

Implementation details

Application developers must do two things to make their tokens SuperchainERC20 compatible. Doing this setup now ensures that tokens can benefit from Interop once the Interop upgrade happens.

1. Permission only SuperchainERC20Bridge to call crosschainMint and crosschainBurn.
2. Deployment at same address on every chain in the Superchain using create2 function.

For now, application developers should view SuperchainERC20as ERC20 tokens with additional built-in functions that allow cross-chain asset movement that will be enabled once Interop goes live.

For step-by-step information on implementing SuperchainERC20, see Deploy assets using SuperchainERC20

Next steps

• Explore the SuperchainERC20 specifications (opens in a new tab) for in-depth implementation details.
• Check out the Superchain ERC20 starter kit (opens in a new tab) to get started with implementation.
• Watch the Superchain interop design video walkthrough (opens in a new tab) for a visual explanation of the concepts.
• Review the Superchain Interop Explainer for answers to common questions about interoperability.