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that is correct. But i could at least show that the change addresses funded Wallet B and Wallet B is my possession. The scammer can not show anything. so at least I show something which correlates the coins back to me.
then you can only prove 2 things:
1. you own address B by
signing a message using its private key (wallet is a total of many keys and their corresponding addresses. you send and receive bitcoin from one or more addresses and any proof that you can provide is from individual addresses)
2. you received coins from address A
3. your question for more details. my lawyer prohibited to post to much information publicly. so I will keep it very summarized.
A. Wallet A had a lot of coins.
B. I send from Wallet A out several transactions of which I do not exactly remember the order.
C. at one point in time I sent out 175 BTC to exchange X of my agent.
D. I then sent out from wallet A some BTC(amount unknown) to a few addresses.
E. I then emptied my wallet A and sent all BTC from wallet A to Wallet B
F. I then sent from wallet B to "exchange X" 275 BTC
I know that it should be possible to show that the the coins from wallet B came from wallet A who sent the 175 BTC to "exchange X". If can correlate this, then I have some evidence to show to the court that these coins were correlated to me and not to the scammer. I am the one who is suing.
you don't need to use chain analysis company for this. any block explorer website could be used to achieve this. you must first gather all the addresses that you know of and then search them one by one in a block explorer and see where the coins are coming from or going to.
for example you know your address(es) B and you know you initially send coins from your address(es) A to it. so simply search address(es) B in a block explorer, go to its first transaction and see what address is paying it. copy the corresponding transaction ID, that is your proof that B has received X amount of coins from A.
you know your exchange address(es) EX, do the same and look for address(es) B and A in it. each received transaction is one of your deposits. copy those transaction IDs. these are proofs of your deposits and their amounts.
here is an example block explorer link:
https://blockchair.com/bitcoin/