Perhaps OP is referring to traking based on the coding? I.E. if you had all the code repos from an individual and ran some sort of pattern reconition software to cross refrence thigs like folder structure, layout of the code, frequency and time of uploads, function & variable naming techniques, etc. This reminds me of a technique called eBiomentrics[0]

[0] https://medium.com/datadriveninvestor/keystroke-dynamics-wha...