The crypto-currency market is double the size of the sub-prime debt in the U.S. on the eve of the financial crisis...

and poses a threat unless urgently regulated, the Bank of England said.

Crypto assets are now worth $2.3 trillion, about 200% more than at the start of the year. While that’s still a small part of the $250 trillion global financial system, it’s about twice the size of the $1.2 trillion sub-prime real estate debt market in 2008.

https://www.bloomberg.com/news/articles/2021-10-13/boe-says-crypto-now-bigger-than-sub-prime-debt-that-led-to-crash

Jemima Kelly, Cryptocurrencies and all that (Bitcoins, Tulips, South Sea Company)

https://englundmacro.blogspot.com/2021/05/jemima-kelly-cryptocurrencies-and-all.html