Call the proposer and the validator functions as follows; python proposer.py PORT NUMBER_OF_PEERS NUMBER_OF_ROUNDS LINES_IN_BLOCK python validator.py PORT NUMBER_OF_PEERS NUMBER_OF_ROUNDS LINES_IN_BLOCK Please start proposer from port 5001, then open other validators by incrementing this by 1; proposer -> 5001 , validator1 -> 5002 ... etc This naming convention is for the TESTER.PY script which will read the files and check if the values are holding properly. (Note that after starting proposer you have to wait 1 sec for API server to start then start other validators) scripts will print as they recieve messages and send messages to make sure we know if something goes wrong