Nintendo encrypts all titles on the NUS with a random AES key. This random key—the title key itself—is then encrypted using a system-wide and stored inside a file called a ticket ( .tik ). The ticket also contains information required to decrypt that key. Each title has its own unique ticket.
It looks like you're asking about the function in Wii U USB Helper , a popular tool used for downloading and managing Wii U and 3DS software. Title Key For Wii U Usb Helper
In the context of Nintendo consoles, including the Wii U, title keys are cryptographic keys used to decrypt and load game data. Each game has its own unique title key, which is required to decrypt the game's content so that it can be played on the console. Nintendo encrypts all titles on the NUS with
Historically, the most used link was titlekeys.ovh , though users now often use mirrors like wiikeys.web.app or vault.titlekeys.ovh when the original site is down. Each title has its own unique ticket
This is the crucial step. You will be prompted to enter a title key URL. One commonly used and reliable URL is http://vault.titlekeys.ovh/ —simply copy this link and paste it into the appropriate field, then click OK. For those who prefer alternative options, URLs like https://wiiu.titlekeys.gq/ have also been widely used in the past.