Asset protection is not the same as hiding assets. Hiding assets is often a crime (such as unlawful failure to disclose), whereas protecting isn't.
Asset protection normally refers to protecting assets from creditors, frivolous seizure, and such by the original owner no longer having effective control over the assets. For example, you might place your assets in a trust or foundation which is controlled by a fiduciary. You then no longer control the assets. They aren't yours.
While asset protection structures often have a high degree of secrecy, they shouldn't be reliant on secrecy to work. Secrecy won't hold up in court.
These structures require︀ a high degree of customisation to fit the type of assets, types and levels of︁ threat, size of wealth, jurisdictions involved, client's interests, and so on and so forth. This︂ makes them expensive and time consuming, which is why they are usually limited to the︃ very wealthy for whom the admin costs are insignificant.
There are a lot of service︄ providers out there selling trusts in a manner similar to how they sell companies. I'd︅ be very cautious about working with such a service provider. The trust you end up︆ with might not be the right fit.