Roger Zelazny 
The Eve of RUMOKO [EPUB ebook] 

Since he was no one, he could be anyone.
He’d been an important part of the team putting together the International Data Bank, which would track every single move made by every single human being. As the project neared completion he realized that no one would ever truly be free again. At the very last moment he blanked his file, changed his face, and created a back door into the system. Now he was nameless, had no past, left no traces, according to the IDB he no longer existed. But he could become anyone at anytime for any reason. Not being in the system meant that he had to earn a living outside of the normal confines of human society. But there were people willing to pay cold, hard cash for a man who could be anyone and then disappear once the job was done.
Project RUMOKO plans to use atomic explosions to create artificial island in the ocean. Someone is trying to sabotage the Project. Our nameless hero has been hired to find out who that Someone is. But when he finds out who and why he has some hard decisions to make that have far reaching consequences.