You can find verified versions of the mantra in Odia script through the following resources: Scribd - Paita Mantra in Odia (Oriya)
Yajnopavitam paramam pavitram Prajapater-yat-sahajam purastat | Ayushyam-agryam pratimuncha shubhram Yajnopavitam balamastu tejah || paita mantra in odia pdf verified