spectrum sharing using blockchain(python) This project contains web UI files with html extension. Paste those files in a folder named UI. 4 Utility files are there.(init,hash_util, printable and verification) Paste themm in a folder named Utility. There are 5 python files required in the main project location i.e. outside above 2 folders.(block, blockchain, wallet, transaction and node) crub.py is the simulation file. This file can simulate the actual scenario of wireless communication environment involving Primary and Secondary Users. Here SU(Secondary User) implements cognitive radio to sense empty spectrum and shares the data collected to other SUs using blockchain.