Why do you need a ref?

Excuse me, but I'm curious to understand why exactly do you need a reference, or 'ref' as you put it? In the world of cryptocurrency and finance, it's not uncommon for transactions or interactions to require a level of trust and verification. Could you elaborate on the specific scenario where a ref is necessary, and how it helps to ensure the integrity and security of the process? I'm eager to learn more about this practice and how it fits into the broader landscape of our industry.