OB_ReturnCabin VS v2-periphery

Once this step is done: For future bridging, I recommend Orbiter.finance https://www.orbiter.finance/ (lower gas fees) to bridge to ZKSync.

In step 5 it says "Go to https://www.orbiter.finance/ and do the following: Select Arbitrum Nova as the network you're bridging from, Select Arbitrum One for the network you're bridging to."

Visit the Orbiter website and connect your MetaMask wallet to the site. Initiate the bridging process, allowing you to move your Ethereum from Arbitrum One to Arbitrum Nova. Follow the prompts and wait for the confirmation.

Seeing your other comments you converted BTC to ETH then sent said ETH to your wallet on the zkSync network, if that's what you did, it simply the same address as your eth wallet, if you want to take your ETH out of the zksync network, you can use https://www.orbiter.finance/ from there you can select zksync Era as the source network and then send it to the network of your choice, the destination address is the same as the one the original funds come from.

I used https://www.orbiter.finance as a bridge.

https://www.orbiter.finance, layerswap just a few I found. Let me know if you need more..

The bridges I use to go from ETH mainnet to Polygon (and vice versa) are umbria and orbiter fiance. Never had any issues with these and a lot of people here use them because they are usually pretty fast and have relatively low fees, but as a disclaimer I just want to add always use anything you're connecting your wallet to at your own risk. And don't take any help offered to you in the DMs as they will be scammers. Good luck!

You can always use the official bridges, but I love using Orbiter.finance for bridging, it's one of the cheapest options and works basically instantly.

For source code, Uniswap V2 Core and Uniswap V2 Peripheral

u/lapurita is right. Uniswap has periphery contracts which are created solely to make the end user experience easier. They have a function to swap ETH for tokens, but the first step is to convert ETH to WETH and then make the swap. Take a look at the Uniswap (v2) source code to see for yourself: https://github.com/Uniswap/v2-periphery/blob/master/contracts/UniswapV2Router02.sol

UniV2Router02

Any of those above functions that have require statements could have triggered it. I guess that is why you suggested the "hardhats console log". I am not familiar with that and will get right on trying to get that to work. Sorry for slow response, it seems since your message I have went all up and down the entire uniswap code database that includes the router, pair, libraries, transferhelper, WETH, etc.... So I just had the most extensive crash course I have ever had. hahahaha... Thanks for pointing me in that direction. I have learned A LOT. Though I still haven't figured out why the error is happening so I will now try using the hardhats console log to debug it.

I've never implemented a flash swap, but I don't see where you exchange anything before your callback to resolve the initial amount. Have you seen Uniswap's full example?

However, I am having trouble importing the Uniswap/v2-periphery because the only tag is 1.0.0-beta.0 shown here. I've tried importing in the following ways with no success:

Learning about flash swaps on uniswap and I'm reading thru this example code and i noticed that this contract only has external functions.

https://github.com/pdaian/flashboys2 https://github.com/kmadorin/flashbot https://www.smartcontractresearch.org/t/research-summary-coding-a-defi-arbitrage-bot/282 https://github.com/ExtropyIO/defi-bot https://github.com/search?q=flash+loan+arbitrage https://blog.infura.io/build-a-flash-loan-arbitrage-bot-on-infura-part-i/ https://blog.infura.io/build-a-flash-loan-arbitrage-bot-on-infura-part-ii/ https://medium.datadriveninvestor.com/maximizing-your-arbitrage-flash-loans-2cbb4c99ed80 https://medium.com/flashbots/frontrunning-the-mev-crisis-40629a613752 https://github.com/Uniswap/uniswap-v2-periphery/blob/master/contracts/examples/ExampleFlashSwap.sol