Functional Requirements

Roles

SkyBridge™ has three roles:

1. admin: full control over the bridge. Able to change the fee structure, change the address of the liquidity pool, and other bridges.
2. pauser: can pause the bridge.
3. backend: can relay fast withdrawal data.

• A standard user can use the bridge to transfer funds.

Features

• Change which tokens are allowed to be fast bridged Required role: admin
• Adjust the fees Required role: admin
• Set the address for the bridge on the other chain Required role: admin
• Pause the bridge Required role: pauser
• Transfer Ethereum through the bridge to the other chain
• Transfer ERC-20 tokens through the bridge to the other chain
• Transfer ERC-721 tokens through the bridge to the other chain
• Initiate a fast transfer from the L2 to the L1

Use Cases

1. Users can transfer tokens from a Layer-1 network to a Layer-2 network (Base).
2. Users can transfer tokens from Layer 2 (Base) to Layer 1 with a 7-day lockout as imposed by the underlying Optimism bridge.
3. Users can transfer approved tokens from Layer-2 (Base) to Layer-1 using the fast bridging mechanism. This mechanism is enabled by a LiquidityPool on Layer-1, which will fund the exchange. After - the challenge period, tokens will be deposited into the LiquidityPool to replenish its balance.