Well, just looked at my NEO GAS deposit address on Binance. I've sent some money to it a year ago and you are right, they indeed send it to their cold storage 2 months later. My main concern and the main reason why I've created this post is that building something like this with the official bitcoin core felt really awkward. It feels like bitcoin core is more of a tool for a single person to use. It's possible to write a wrapper around bitcoin core, that would make sure bitcoin core always alive and that would be processing all the transactions that bitcoin core cathes and store them. I just have no idea about how it's done in reality with all these big exchanges. There will always be differences between node software for different coins, does that mean that big exchanges run all of them behind different wrappers? That seems a bit absurd. Do they write a separate software that easily adapts and scales for many coins or do they actually have hundreds of official nodes and wrappers around them? I really want to meet a person here who ever had experience with building these systems in production.