This effort prototypes a simplified end-to-end flow of FIO Wrapping.

Use case

Wrap FIO Token:

1. Alice executes wraptokens on FIO chain

2. Oracle monitors wraptokens for transfers

3. Oracle executes ERC-20 approve

4. Alice calls ERC-20 blanceOf to get balance

5. Alice executes ERC-20 transfer

Assumptions

• Assume there is a single Oracle managing all transactions. Do NOT worry about multisigs, approvals, etc.

• No validation on either chain is required.

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Diagram link: https://drive.google.com/file/d/12f8iOoZjj1txZCJprpuQ5VFb8Ejpc9Bp/view?usp=sharing

Deployment

• fio.wrapping: contract deployed to DEV server with V1 History (eventually will move to Hyperion)

• oracle: daemon running on server

• ERC-20: open zeppelin contracts on Ropsten testnet

TBD

• How will Alice execute the transfer? Are there standard interfaces or tools to do this?

• amounts on FIO are int64, amounts on ERC-20 are uint256