Signing a Deed of Assignment and having that Deed is your number 1 evidence against another person that is trying to claim ownership of that same land too. If you have a land and no deed yet, i feel sorry for you! Better consult your Lawyer to go draft one for you now to save yourself future problems
Now what really is Ratification or Land Regularization in Lagos state?
Above is Baba Dodo a notorious Land Con Artist and well known Omonile that operates within the Ibeju Lekki and Free Trade Zone Axis. He and his fellow Land Scam Artists pictured here, specialize in reselling other people's lands. He once sold the land where his late wife was buried without the consent of his children 3 months after she was buried. If you see him and his ilk run!!! These are the type of people that should make you conduct a Land Verification exercise before you lose Millions of Naira because they specialize in stealing other people's land to resell it to unsuspecting buyers and when wahala comes, they would disappear leaving you with no money or Land.
Personally i have lost 3 lands in the past because i wasn't buoyant enough to both buy a land and fence it at the same time and i hoped the land would still be waiting for me after 4 months of purchase but three times consecutively my lands were re-sold to different people and it put me at odds with these trespassers for years. With this in mind, i would advise you on the steps to take to take possession immediately so you don't suffer the same fates i experienced.