Foundations of Blockchain

Proof of Existence web server

A Proof of Existence web server is an interface for communicating with the MultiChain blockchain. We will create a REST API to communicate with the blockchain application. Each user will be able to send requests to perform publish and verify operations through this web interface.

First, the packages required to encode the data and create the web server need to be imported. The default port number of the web server is set to 8000:

import binascii 
import json as JSON 
 
from base64 import b64encode, b64decode 
from datetime import datetime 
from sanic import Sanic 
from sanic.response import json 
from sanic_cors import CORS, cross_origin 
from poe_libs import Document
port = 8000 

The next step is when the document object ...