Foundations of Blockchain

Basic smart contract

First, we will create a simple Python script that returns a concatenated string to greet the user:

from boa.builtins import concat 
 
def main(name): 
  return concat("Hello ", name) 

The contract script uses the concat method provided by boa to concatenate two strings. Every smart contract should have a function called main, which will be the entry point. The smart contract needs to be compiled into byte code, which can be executed in the NeoVM. The contract can be compiled by the neo-python shell using the neo-boa compiler as follows:

build hello.py test 07 07 False False Alice 

The build command is supplied with a test argument to test the sample outcome. The code immediately after the test flag represents the data ...