blockchain.py

Courageous Caribou answered on October 30, 2021 Popularity 8/10 Helpfulness 1/10

answer blockchain.py

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blockchain.py

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$ python blockchain.py
* Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)

Popularity 8/10 Helpfulness 1/10 Language python

Source: hackernoon.com

Tags: python

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Contributed on Oct 30 2021

Courageous Caribou

0 Answers Avg Quality 2/10

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from hashlib import sha256
import uuid

class Block:
    hash = ""
    nonce = 0
    blockNumber = 0
    previousHash = ""
    data = ""

    def __init__(self, _previousHash, _data, _blockNumber):
        self.previousHash = _previousHash
        self.data = _data
        self.blockNumber = _blockNumber

    def calculateHash(self):
        newHash = str(self.blockNumber) + str(self.nonce) + self.previousHash + self.data
        return sha256(newHash.encode('utf-8')).hexdigest()

#--------------------------------------------------------

def mineBlock(_block):
    _block.hash = _block.calculateHash()
    while _block.hash[0:len(target)] != target:
        _block.nonce += 1
        _block.hash = _block.calculateHash()
    return _block

def printBlock(_block):
    print("New block ! :")
    print(f"* Number : {_block.blockNumber}")
    print(f"* Previous hash : {_block.previousHash}")
    print(f"* Hash : {_block.hash}")
    print(f"* Data : {_block.data}")
    print(f"* Nonce : {_block.nonce}")
    print("\n"*3)


target = "00000"
genesis = block = Block("0"*65, "I'm the first block ! yaaaay !", 0)
genesisMined = mineBlock(genesis)

printBlock(genesisMined)

blockchain = [genesisMined]


for i in range(10):
    randomData = str(uuid.uuid4())
    lastBlock = blockchain[-1]
    previousHash = lastBlock.hash
    blockNumber = lastBlock.blockNumber + 1

    newBlock = Block(previousHash, randomData, blockNumber)
    
    minedBlock = mineBlock(newBlock)
    printBlock(minedBlock)
    blockchain.append(minedBlock)

print("All block mined !")

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Source: Grepper

Tags: blockchain b

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Contributed on Mar 15 2023

p2sias

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blockchain.py

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{
 "sender": "my address",
 "recipient": "someone else's address",
 "amount": 5
}

Popularity 8/10 Helpfulness 1/10 Language python

Source: hackernoon.com

Tags: python

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Contributed on Oct 30 2021

Courageous Caribou

0 Answers Avg Quality 2/10

blockchain.py

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-1

from hashlib import sha256
x = 5
y = 0  # We don't know what y should be yet...
while sha256(f'{x*y}'.encode()).hexdigest()[-1] != "0":
    y += 1
print(f'The solution is y = {y}')

Popularity 8/10 Helpfulness 1/10 Language python

Source: hackernoon.com

Tags: python

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Contributed on Oct 30 2021

Courageous Caribou

0 Answers Avg Quality 2/10

blockchain.py

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