I tried sending a few coins and it turned out smoothly and quickly. There is a little mechanism that confuses me. Is this some kind of internal transaction in a hot wallet or is there another reason? and how the transaction goes without requiring a confirmation block and fees considering that each user's wallet has a different address.
It's looks like the Binance use "branch address system", it's makes me curious why that transfer is only work within the same Binance branch, maybe they use same wallet with thousand address for one branch and use the mechanism like
Zelle apps. That just my guess, cmiiw.