I am always looking for interesting new projects and I found something called
zCash Sidechain using BIP300, zSide and Melt/Cast for making fully anonymous transaction.
If the addresses and other identifiable sources and destinations of transactions are already pseudonymous, the only way you're going to be able to identify
who is doing all this is with documents.
Without documents the only conclusions you'll be able to make are things like "someone moved an old 2011 address", "someone moved a 1000BTC address", etc. All of these
anonymous techniques become useless for people who willingly verify themselves to a custodial service!