Pretty good companies. Here is a summary and short info:

https://www.chainalysis.com/ Helped with Mt. Gox. New York company.
https://whitestream.io/ Solved Coinbase and Hamas related problems. Israeli company.
https://www.elliptic.co/ They have offices in Singapore and Japan, a British company. This company recently discovered a Hamas related group receiving donations. This is pretty new, September 2019.

For further information on these three companies, check out:
https://acfeinsights.squarespace.com/acfe-insights/3-companies-developing-blockchain-analytics-tools

I think you could use a blockchain-related lawyer company. Check out Blockchain Law Society https://blockchainlawsociety.com/
Here is another one: https://www.njordlaw.com/areas-of-expertise/blockchain-cryptocurrency-fintech/
https://www.twobirds.com/en/in-focus/blockchain
etc. I don't know where you are located, but it is best if you use a blockchain-related lawyer, as opposed to a generic one. You can google them for your country or write your country here and people will provide advice on that. I am assuming you already have one, but they can collaborate.