OB_ReturnCabin VS bitcoinbook

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.

"Mastering Bitcoin" by Andreas M. Antonopoulos: The printed version is not free, the complete text is available on GitHub. It's an excellent resource for understanding Bitcoin from a technical perspective.

The target is stored in the block header. You can see it in any block explorer labeled BITS or nBits. It is stored in a compressed format, as described in Mastering Bitcoin https://github.com/bitcoinbook/bitcoinbook/blob/develop/ch10.asciidoc Scroll down to "Target Representation"

Mastering Bitcoin is a free book - https://github.com/bitcoinbook/bitcoinbook

I also highly recommend that you Read this book "Mastering bitcoin", its free and open source: https://github.com/bitcoinbook/bitcoinbook

You should read this chapter - it kinda explains why the chip need to be able to manipulate and access the private key. It works exactly the same way for every hardware wallet.