BridgeCommunication

Backend scripts to help contracts read and write to each other on different blockchains.

Connecting to Networks

The following network endpoint types were used:

Goerli

-Local node synced (Prysm and Geth post merge)

-Infura WSS

Optimism

-Alchemy WSS

Mumbai

-Quicknode WSS

General Overview

1. Owner adds 1000 wei [ETH] (or another token) to another side of a bridge

2. User requests to bridge 1000 wei by paying 1003 wei (3 wei covers the 0.3% fee)

3. After deposit is made, user is added to the user bridge queue

4. Owner detects user in queue

5. Locally store user in queue with Golang variable ⚠️ Assume bridge will not go down with the stored address removed from queue. ⚠️

6. Dequeue to remove user from the queue.

7. Unlock the added wei [ETH] (or another token) to the user locally stored, then remove user locally.

⚠️

We remove the user locally between chains before the contract sends funds follow a "change state =>" then transfer pattern to prevent reentrancy attacks.

Ideally we remove the user from the queue like the mock Chainlink Keepers for simplicity.

If we had CCIP, we would be able to easily call between different contracts on different blockchains to have the same contract format.

For extra unlock security, the contract has

    msg.sender != Owner

which would revert the unlock function call .

⚠️

Golang Version Manager: Use Go 1.17

    gvm use go1.17

GoerliBridgeToOptimism

    cd GoerliBridgeToOptimism

GoerliToMumbai

    cd GoerliBridgeToMumbai

Owner Deposit

    go run ownerDeposit1000wei.go

User Lock

    go run userLock1000wei.go

Owner Unlock

    go run ownerUnlock1000weiBlockListner.go

Owner Withdraw

    go run ownerWithdraw1000wei.go