The "poliigon ubermapping node" was made by Blender Guru (Andrew Price):  
https://www.poliigon.com/  
https://www.youtube.com/channel/UCOKHwx1VCdgnxwbjyb9Iu1g  

Textures were licensed under GPL 3.0 as part of the Extreme Pbr Evo library by Andrew_D: https://blendermarket.com/products/extreme-pbr-addon-for-blender-279-2   
https://www.gnu.org/licenses/gpl-3.0.txt  

The TezosCoin mesh and vertex colors as well as the meshes, vertex colors, materials and animation in TezosCoin_Textured were made by me @VictorGiers
Use them freely the license is CC0 v1.0: https://creativecommons.org/publicdomain/zero/1.0/