sourav11295 commited on
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  1. Blockchain.jpg +0 -0
  2. blockchain.py +143 -0
  3. requirements.txt +1 -0
Blockchain.jpg ADDED
blockchain.py ADDED
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+ # -*- coding: utf-8 -*-
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+ """Blockchain.ipynb
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+
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+ Automatically generated by Colaboratory.
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+
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+ Original file is located at
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+ https://colab.research.google.com/drive/1wfXS6MTMX2J77EP5X1qFiKQzdo_eh511
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+ """
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+
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+ import datetime
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+ import hashlib
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+ import json
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+
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+ class Blockchain:
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+
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+ def __init__(self):
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+ self.chain = []
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+ self.create_block(proof=1, previous_hash='0')
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+
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+ def create_block(self, proof, previous_hash):
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+ block = {'index': len(self.chain) + 1,
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+ 'timestamp': str(datetime.datetime.now()),
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+ 'proof': proof,
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+ 'previous_hash': previous_hash}
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+ self.chain.append(block)
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+ return block
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+
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+ def print_previous_block(self):
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+ return self.chain[-1]
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+
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+ def proof_of_work(self, previous_proof):
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+ new_proof = 1
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+ check_proof = False
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+
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+ while check_proof is False:
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+ hash_operation = hashlib.sha256(
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+ str(new_proof**2 - previous_proof**2).encode()).hexdigest()
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+ if hash_operation[:5] == '00000':
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+ check_proof = True
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+ else:
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+ new_proof += 1
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+
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+ return new_proof
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+
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+ def hash(self, block):
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+ encoded_block = json.dumps(block, sort_keys=True).encode()
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+ return hashlib.sha256(encoded_block).hexdigest()
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+
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+ def chain_valid(self, chain):
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+ previous_block = chain[0]
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+ block_index = 1
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+
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+ while block_index < len(chain):
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+ block = chain[block_index]
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+ if block['previous_hash'] != self.hash(previous_block):
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+ return False
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+
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+ previous_proof = previous_block['proof']
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+ proof = block['proof']
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+ hash_operation = hashlib.sha256(
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+ str(proof**2 - previous_proof**2).encode()).hexdigest()
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+
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+ if hash_operation[:5] != '00000':
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+ return False
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+ previous_block = block
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+ block_index += 1
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+
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+ return True
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+
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+ def create_chain():
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+ global blockchain
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+ blockchain = Blockchain()
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+ return "Chain Instantiated"
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+
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+ def del_chain():
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+ global blockchain
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+ del blockchain
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+ return "Chain Deleted"
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+
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+ def mine_block():
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+ previous_block = blockchain.print_previous_block()
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+ previous_proof = previous_block['proof']
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+ proof = blockchain.proof_of_work(previous_proof)
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+ previous_hash = blockchain.hash(previous_block)
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+ block = blockchain.create_block(proof, previous_hash)
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+
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+ response = {'message': 'A block is MINED',
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+ 'index': block['index'],
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+ 'timestamp': block['timestamp'],
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+ 'proof': block['proof'],
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+ 'previous_hash': block['previous_hash']}
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+
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+ return response
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+
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+ mine_block()
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+
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+ def hack_block(index,value):
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+ index=int(index.split(" ")[1])-1
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+ blockchain.chain[index]['proof']=value
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+ return f"block modified at index:{index+1}"
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+
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+ def display_chain():
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+ try:
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+ response = {'chain': blockchain.chain,'length': len(blockchain.chain)}
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+
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+ except:
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+ response = "No chain found"
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+ return response
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+
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+ def valid():
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+ valid = blockchain.chain_valid(blockchain.chain)
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+
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+ if valid:
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+ response = {'message': 'The Blockchain is valid.'}
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+ else:
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+ response = {'message': 'The Blockchain is not valid.'}
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+ return response
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+
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+ import gradio as gr
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+
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+ with gr.Blocks(title='Blockchain Simulator') as demo:
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+ gr.Image(value="./Blockchain.jpg",show_label=False,shape=(1500,300))
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+ with gr.Row():
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+ with gr.Column(scale=3):
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+ display = gr.Textbox(label="Blockchain Output",lines=5)
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+ dblock = gr.Button("Display/Refresh Blockchain")
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+ with gr.Column(scale=2):
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+ cblock = gr.Button("Instantiate Blockchain")
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+ mblock = gr.Button("Mine a Block")
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+ vblock = gr.Button("Validate Blockchain")
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+ delblock = gr.Button("Delete Blockchain")
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+ with gr.Column(scale=2):
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+ index = gr.Radio(choices=["index 1", "index 2", "index 3"],label="Choose an Index to hack")
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+ value = gr.Textbox(label="New Value", placeholder = "Enter a Value")
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+ hblock = gr.Button("Hack a Block")
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+ dblock.click(fn=display_chain, inputs=[], outputs=[display],show_progress=True)
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+ cblock.click(fn=create_chain, inputs=[], outputs=[display],show_progress=True)
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+ mblock.click(fn=mine_block, inputs=[], outputs=[display],show_progress=True)
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+ vblock.click(fn=valid, inputs=[], outputs=[display],show_progress=True)
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+ delblock.click(fn=del_chain, inputs=[], outputs=[display],show_progress=True)
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+ hblock.click(fn=hack_block, inputs=[index,value], outputs=[display],show_progress=True)
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+
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+ demo.launch()
requirements.txt ADDED
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+ gradio