Well, as long as the source of income is legitimate, you have nothing to fear. Just make sure you have strong evidence that back up the works you handled in the past, with all payments and possibly your payers contact. One of the easiest way the government or banks know you actually got the money from the right source/sources is through accounts/addresses, services and transactions linked together. They will likely verify to see if the services are actually tied to accounts/addresses you transacted with and whether the services are what the transactions were really for.
This evidence need to be complied and kept safely incase government or bank requests for it.
Concerning keeping things private, ofcourse a Land Trust looks like a nice way to handle that in the system. A non traditional crypto-compatible approach with no government to over burden you, could be to go offgrid and own a mobile homes in remote community, possibly with cryptographic proof of ownership. You could aswell pay for the home in the offgrid community in Bitcoin without going through any bank.
Documentation is probably the most important part of this process even if the income came from legitimate online work, it becomes much harder to explain years later if there are no records showing how it was earned.
I also think it’s better not to wait until the house purchase before organizing everything. Keeping transaction history, invoices, payment records and any communication with clients over time creates a much clear trail. That way, if a bank or tax authority ask questions, you will be relying on evidence rather than trying to reconstruct events from your memory.
Privacy is understandable but I wouldn’t let it come at the expense of proper documentation. In the long run having a transparent record of legitimate earning is what protects both your access and your peace of mind.