It's indeed a common technique, not my original idea. SCTP seems to be from 2000, but good old tcp also already does this with its sequence numbers (albeit 32-b

It's indeed a common technique, not my original idea. SCTP seems to be from 2000, but good old tcp also already does this with its sequence numbers (albeit 32-bit, so while it can't be relied on fully it does prevent amplification specifically).