Who is the bounty hunter whose DNA is used for the clone army?

The story behind the answer

Kamino’s cloners used a single elite bounty hunter as the genetic template for the Grand Army of the Republic, contracted in secret by Count Dooku (Darth Tyranus). As part of the deal, he asked for one unaltered clone to raise—Boba—while the rest were engineered for accelerated growth and obedience. That sets him apart from Boba Fett (the unaltered clone, not the template), Cad Bane (a Duros gunslinger active during the Clone Wars), and Aurra Sing (a sharpshooter with no connection to the cloning program).

His DNA shaped every clone trooper, from ARCs to commanders like Cody, and his death at Geonosis at Mace Windu’s hand reverberated through the war. This secret recruitment and mass production of soldiers paved the way for Order 66 and the Empire’s rise.