Trying a little experiment using a programming language.

[finaleshot2016]

So I just want to share this little achievement of mine, I know it's kinda easy for some to make this but for me as a beginner, it's very satisfying. So I made a simple blockchain using a Programming language which is Python. Some of you already know what Python is, it's a programming language that is similar to c+, java and many more. You can use it to manipulate modules especially advanced devices to work based on your instructions.

I made a twist here, I'm actually doing this experiment by using my Raspberry Pi. --

It's kinda basic though but for me, it's another learning that I've achieved today.

So these are the codes that I've used on my blockchain.

Code:

import datetime
import hashlib

class Block:
    blockNo = 0
    data = None
    next = None
    hash = None
    nonce = 0
    previous_hash = 0x0
    timestamp = datetime.datetime.now()

    def __init__(self, data):
        self.data = data

    def hash(self):
        h = hashlib.sha256()
        h.update(
        str(self.nonce).encode('utf-8') +
        str(self.data).encode('utf-8') +
        str(self.previous_hash).encode('utf-8') +
        str(self.timestamp).encode('utf-8') +
        str(self.blockNo).encode('utf-8')
        )
        return h.hexdigest()

    def __str__(self):
        return "Block Hash: " + str(self.hash()) + "\nBlockNo: " + str(self.blockNo) + "\nBlock Data: " + str(self.data) + "\nHashes: " + str(self.nonce) + "\n--------------"

class Blockchain:

    diff = 20
    maxNonce = 2**32
    target = 2 ** (256-diff)

    block = Block("Genesis")
    dummy = head = block

    def add(self, block):

        block.previous_hash = self.block.hash()
        block.blockNo = self.block.blockNo + 1

        self.block.next = block
        self.block = self.block.next

    def mine(self, block):
        for n in range(self.maxNonce):
            if int(block.hash(), 16) <= self.target:
                self.add(block)
                print(block)
                break
            else:
                block.nonce += 1

blockchain = Blockchain()

for n in range(10):
    blockchain.mine(Block("Block " + str(n+1)))

while blockchain.head != None:
    print(blockchain.head)
    blockchain.head = blockchain.head.next

credits to howCodeORG of github.

The code is already existing but the twist here is I used my RPi. 
I also know that some of you aren't familiar with this kind of software so here it goes.

Once I put all of the codes in the terminal of Rpi, it's now ready to run.
This is the output of blockchain.py.

It generates its own Block Hash and Hashes. You can also try it on your pc/laptop, RPi is also applicable since it's the device that I've used to show this.
--

Thanks for reading!

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[BQ]

Cool and interesting! Good job 
How is it stored?

[pooya87]

i am not familiar with python but your code looks broken to me. it is accepting the first hash without proper comparison with the target you provide which is why all of your nonces are zero.
two more things.
you are using utf-8, which may be wrong since usually the data you fetch is in hex
also if this is for Bitcoin, then the hash function is double SHA256 meaning SHA256(SHA256(header)). if it is a test then use a faster hash algorithm such as MD4. if you do use another hash function you also must change your target based on the hash digest size (128 bit in case of MD4)

PS. keep it up.

[finaleshot2016]

i am not familiar with python but your code looks broken to me. it is accepting the first hash without proper comparison with the target you provide which is why all of your nonces are zero.
two more things.
you are using utf-8, which may be wrong since usually the data you fetch is in hex
also if this is for Bitcoin, then the hash function is double SHA256 meaning SHA256(SHA256(header)). if it is a test then use a faster hash algorithm such as MD4. if you do use another hash function you also must change your target based on the hash digest size (128 bit in case of MD4)

PS. keep it up.

I think the diff=0 that's why nonces are zero too. I'll try to fix it.

--

changed the diff=20.