Bitcoin et. al. are fairly easily de-anonymized, and financial experts have cracked tough money laundering cases.
These goings-on all came at a cost, and Epstein (and his buddy Trump) worked financial black magic.All that incoming pay to play and blackmail money, AFAICT, was laundered, and not accounted for.
And it can be uncovered either through open source intelligence, or via subpoena by subcommittees.
The Epstein family emails were obtained in that way, and I imagine that financial records, especially those of banks who were likely part of the schemes, can be obtained.
Recall the scene in Scarface where they are hauling bags of money into a bank in public. It's not far from that in terms of gigantic sums disappearing.
Just my two cents' worth.
Examples of open source intelligence are included in this post.
https://www.democraticunderground.com/100220810679
I know nothing about existing records, and totally distrust the custodians.
For example, aerospace engineers were/are lectured constantly on protection of classified documents and almost unanimously honored the rules. But the biggest sales to enemies was by custodians of large tranches of documents, who did not produce them.
Take the case of Robert Hanssen.
https://en.wikipedia.org/wiki/Robert_Hanssen
Distrust custodians.