Merge pull request #994 from NEERAJAP2001/Bit_coin

Added Bit coin Mining script

Author: prathimacode-hub

BasicPythonScripts/BitCoin Mining Script/BitCoin_Mining.py

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+
+# INPUT : Transactions = '''Neeraj->Zara->50,Nandu->Allu->5''' , difficulty=2 ,
+#         Previous_hash = a7sdxa036944e29568d0cff17edbe038f81208fecf9a66be9a2b8321c6ec7
+
+# OUTPUT : Successfully mined bitcoins with nonce value:336 end mining. Mining took: 12.207852363586426 seconds
+# 006f74cef9d071afa15c58b38198be14f9b4aabb4cd6f7a44afffd9f6968efcd
+
+# Import the sha256 function
+from hashlib import sha256
+
+# Nonce value 
+MAX_NONCE = 10000
+
+
+# Function for encoding text to a 64 bit hexadecimal value
+def SHA256(text):
+    return sha256(text.encode("ascii")).hexdigest()
+
+
+# function for guessing nonce value
+def mine(block_number, transactions, previous_hash, prefix_zeros):
+
+    # string with difficulty zeroes
+    prefix_str = '0'*prefix_zeros
+
+    # nonce is the value we want 
+    for nonce in range(MAX_NONCE):
+
+        # concatinating the string and encoding it
+        text = str(block_number) + transactions + previous_hash + str(nonce)
+        new_hash = SHA256(text)
+
+        # if matched the mined successfully
+        if new_hash.startswith(prefix_str):
+            print(f"Successfully mined bitcoins with nonce value:{nonce}")
+            return new_hash
+
+    # might raise exception due to hardware issues etc
+    raise BaseException(f"Couldn't find correct has after trying {MAX_NONCE} times")
+
+
+# Driver Code
+if __name__=='__main__':
+    
+    # Transactions string
+    transactions=input('Enter Transactions : ')
+    
+    # Number of prefix zeroes
+    difficulty=int(input('Enter Difficulty level : '))
+
+    # For knowing time taken for mining
+    import time
+    start = time.time()
+    print("start mining")
+
+    previous_hash=input('Enter Previous has value : ')
+
+
+    # Calling mine function with all required parameters
+    new_hash = mine(5,transactions,previous_hash, difficulty)
+
+    # total time for refrence
+    total_time = str((time.time() - start))
+    print(f"end mining. Mining took: {total_time} seconds")
+    print(new_hash)

BasicPythonScripts/BitCoin Mining Script/Images/Sample.png

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+# What Is Bitcoin Mining?
+Bitcoin mining is performed by high-powered computers that solve complex computational math problems; these problems are so complex that they cannot be solved by hand and are complicated enough to tax even compelling computers.
+
+## Terminology :
+1. Transaction: An transaction is a transfer of Bitcoin value and is collected in Blocks 
+
+2. SHA256: a function that can generate an almost-unique 256-bit (32-byte) signature(Hexa-Decimal) for a text.
+
+3. Block: Blocks are files where data about the Bitcoin network are permanently recorded
+
+4. Nonce: Miners have to guess this number which will reward them BTC. A nonce is an abbreviation for "number only used once," which is a number added to a hashed—or encrypted—block in a blockchain that, when rehashed, meets the difficulty level restrictions. 
+
+5. Difficulty Level: Number of prefix Contagious Zeroes 
+
+
+## Theory :
+BTC will be rewarded if Nonce gives us a string with Zeroes' prefix the difficulty number of times. Sounds confusing?
+So, Let's take an example :
+1. Let's assume we have a difficulty level = 20 
+2. Now, Let's again assume that we have the previous hash as: 'a5x208fecf9a66be9a2bc7...'
+3. Now we create text as  : text = str(block_number) + transactions + previous_hash + str(nonce)
+4. Now, we pass text to SHA256 Function to generate hash
+5. Finally, that hash prefix must be equal to the number of zeroes as difficulty level.
+6. And Boom!! You have mined successfully.
+
+## To Run the script :
+1. Run Command ```BitCoin_Mining.py```.
+2. Now Enter Required Values.
+3. You have Mined succesfully!!.
+
+## Sample Test Case :
+INPUT : Transactions = '''Neeraj->Zara->50,Nandu->Allu->5''', difficulty=2,
+        Previous_hash = a7sdxa036944e29568d0cff17edbe038f81208fecf9a66be9a2b8321c6ec7.
+OUTPUT : Successfully mined bitcoins with nonce value:336 end mining. Mining took: 12.207852363586426 seconds
+006f74cef9d071afa15c58b38198be14f9b4aabb4cd6f7a44afffd9f6968efcd.
+
+## Draw Backs:
+The script has no drawbacks, but due to the increase in miners, the difficulty level increases, and hence we'd require the best hardware as the fastest wins. 
+
+# Refrences 
+[Investopedia](https://www.investopedia.com/terms/b/bitcoin.asp)
+
+[Computerphile Video](https://www.youtube.com/watch?v=wTC31ZI6QM4)
+
+[Codebasics Video](https://www.youtube.com/watch?v=ZhnJ1bkIWWk&t=143s)
+
+
+## OUTPUT :
+![Sample](https://user-images.githubusercontent.com/65017645/121875123-b9d28e00-cd25-11eb-83cf-08980046c540.png)
+
+
+
+
+Script By : Neeraj Ap
+
+
+

BasicPythonScripts/BitCoin Mining Script/README.md

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+