HotWallets, ColdWallets and Lightning Integrations - What Are Some of the Hiccups?

There's a lot of interesting stuff. I think especially with the hot wallets, I guess I could start there because that was the first stuff I worked on before I got there. They were using an external provider and then with a little bit of their own build stuff. But then we started building something more from scratch, custom built to handle all the on-chain volume. So one of the things is transaction batching. Batching the withdrawals together so that they take up less space. Doing coin selection is super interesting because the fees you pay on-chain can be super, super high if you don't properly manage your UTXOs. And then fee bumping is another super interesting thing