Tranching is the oldest technology in credit. A 47% drawdown in the collateral and the pref still finishes the year up 9%, because the common beneath it absorbed the entire move. The -27% to +9% spread across the stack is seniority being priced in real time.
What is new is the collateral. Bitcoin trades 24/7 at a live market price, so the entire structure is marked continuously, something no mortgage pool or loan book ever offered.