I don't know if someone can help me but I found out someone has stolen several times some crypto of me, mostly bitcoins. He had access to my computer and my phone to do the Google Authenticator because he is my IT guy.
I know who it is and everything is on police investigation but they can not do much on it at this moment.
So I would like to know if there is a possibility to track my Bitcoin transfers after they have been exchanged to another crypto.
When I look on the blockchain we just see 1 transfer and after this no trace anymore.
We already know he exchanged some Bitcoins to Ethereum, but how can we track or trace this exchange?
Is there a possibility to know which Crypto Wallet Company received my stolen Bitcoins?
I would like to know if there is a possibility to track my Bitcoin transfers after they have been exchanged to another crypto.
There is always a possibility but it is generally beyond the capabilities and resources of a single victim. If you and other identifiable victims have lost the equivalent of millions of dollars then you may be able to get local police engaged. Otherwise you will need to spend large sums of money with blockchain analytics firms and gather evidence that can eventually be built into a legal case that can be used to compel exchanges to divulge confidential customer data. Legal costs may be substantial and involve lawyers in several jurisdictions.
Remember that cryptocurrencies like Bitcoin were designed to make this difficult. Services such as mixers were created to make it even harder. Following money through multiple cryptocurrencies will be harder still.
There were several transfers from your wallet to the thiefs wallet(s). This would be the chance to catch the scammer:
All involved bitcoin addresses needs to be analysed to see if there are more addresses belonging with a high liklihood to the same scammer.
All outgoing transactions from each of the addresses of 1) needs to be traced if they end up in one of the millions of known exchange addresses
If there are evidences then the police should ask the exchange directly (or via help of their peers in the exchanges country) for any information about the scammer which is likely their client. This can be the id, bank account, a bitcoin withdrawal address or an altcoin withdrawal address. In the first two cases you can claim back the lost funds. In the last two cases this is the starting point for a new analysis/tracing
If someone moves bitcoin to an exchange then the follow on activities aren't visible in the blockchain anymore, then the exchanges support is needed.
To be more specific I'd need to see the bitcoin address(es) where the coins went to after leaving your wallet.