Cross-chain Rebase Token

1. CCIP Rebase Token: A protocol that allow users to deposit into a vault and in return, receive rebase tokens that represents their underlying balance.

2. Rebase token -> dynamic balanceOf() to show changing balance with time.

   • Balance increases linearly with time
   • Mint token to users everytime an action is perform (minting, burning, transferring, bridging)

3. Interest rate: Rate at which the balance is increasing linearly with time

   • Individualy set an interest rate on each user based on some global interest rate of the protocol at the time the user desposits into the vault
   • This global interest rate can only decrease to incentivise/reward early adopters.
   • Increases token adoption
   • 

Contracts

1. Token Contract

   • The core ERC-20 token with rebase (elastic supply) logic
   • Automatically adjusts token balances over time to reflect interest accrual

2. Pool Contract

   • Manages liquidity and cross-chain transfers
   • An intermediary to safely "lock/burn" tokens on the source chain and "release/mint" on the destination chain

3. Vault Contract

   • Acts as the collateral manager or "entry/exit gate" for the protocol
   • Collateral vault for ETH deposits/withdrawals

4. Deployment Script

   • Deployment script for creating Rebase Token and Pool contracts on Sepolia Eth and ZKSync Sepolia.
   • Deployment script for creating Vault contract on Sepolia Eth.

Known Issues

• Owners can set themselves the role of "MINT_AND_BURN_ROLE"

Design Flaws

• A user can initally deposit into to get a more preferred higher interest rate, then some time later, in order not to get a new lower interest rate when depositing more (interest rate will be reduced over time), the user would be able to use a second wallet to send over the deposit, thereby, retaining the higher interest rate.