Walletexplorer is probably your best starting point. Should actually give you quite a bit to work from.
There are a few old players in the field of blockchain forensics and hearing states and intelligence are developing including for enforcement and regulatory use, but they cost money, lots of money. Check out Chainalysis and Cointeliigence maybe also resources from education like
http://courses.dfironlinetraining.com/bitcoin-forensicsBitFury back in March even spent research on a fairly recent tool
https://medium.com/@BitFuryGroup/bitfury-launches-crystal-a-blockchain-investigative-tool-for-law-enforcement-and-financial-3d7712dd5dce. Don't know why they pursued this though. Methinks to get on the good side of the law in future.
If you're keen on trying your own open source like suggested above, try Blockparser and BTCSpark.
Finally, blockchair has some interesting basic tools like searching for messages on blockchain.
@srsandokan... Nilsson's analysis? Surprised anyone thought that would translate into reality. Telling you, no one if any of those creditors would liquidate at 33% of ATH
