Chang is the only collector in Taiwan with a complete set of Taiwan Lottery tickets. His collection consists of individual tickets, lottery ticket sheets, specimens, "interesting numbers," and winning number lists, and even things like sales point advertising signs and special lottery cash bags used by ticket agents. He certainly deserves the title Taiwan's Lottery Guru.
身為全台唯一全套完整的愛國獎券藏家，張維信不僅有單張、大全張、樣張、趣味聯號、中獎號碼單，連銷售點的宣傳牌、經銷商專用的收錢袋，都在他的蒐藏範圍內，「愛國獎券達人」的封號，的確名不虛傳。