The investor who foresaw the mortgage crisis is wary of so-called proof of reserves.

Such reviews on a firm's digital holdings are meaningless, according to the former hedge fund manager.

Auditors were learning on the job when I started using a new kind of credit default swap. It's not a good thing. The audit is meaningless.

—Cassandra B.C. (@michaeljburry) December 16, 2022

Mazars, the French accounting firm used by Binance and other larger players in the space to produce proof-of-reserves reports, stopped work on Friday.

Proof of reserves is being promoted as a way to assure customers that their assets are secure.

Critics say that proof of reserves doesn't give a complete picture of a company's risks.

Following the collapse of FTX, a $32 billion empire started by Sam Bankman- Fried, there has been a cry for audits.

FTX filed for bankruptcy last month after it was revealed that its native token was being used to support Bankman-Fried's firm. Customer money was lost by the firm.