The case I was consulted for was pretty bog standard “guy claims he lost his bitcoin in a hard drive reformat X years ago; wife claims BS and wants half of peak market value as of the highest historical price.”

Without getting into identifying details, I was able to use blockchain data to independently verify the guy’s claims. Traced transactions, found watermarking features tying them to specific wallet versions. Can’t actually prove that the keys were destroyed of course, but I did show the coins were being spent like crazy from one wallet on one machine, then all activity stopped right around when he claims he reformatted the computer, and the coins sit there on those same wallet outputs to this day, even with multiple market peaks in the intervening years, and many years between then and when he became aware of his wife’s intent to divorce.

That’s the way things go in court cases. Us software developers like to think that the law is a highly rational, proof based system. But in reality it basically comes down to “which story seems more believable” in the end, and being able to point to technical proof is the exception.