SimpleBlockchain.py

import hashlib, json

def hash_blocks(blocks):
    prev_hash = None
    hashes=[]
    for block in blocks:
        block['prev_hash'] = prev_hash
        block_serialized = json.dumps(block, sort_keys=True).encode('utf-8')
        block_hash = hashlib.sha256(block_serialized).hexdigest()
        hashes.append(block_hash)
        prev_hash = block_hash
    return hashes

bankdetails=[["all features of bank account1"],["all features of bank account2"],["all features of bank account3"]]
socialmedia=["image1","image2","image3"]
reporteddata=["pdflist","imagelist","textinputlist"]
data=["aadharnumber","name",bankdetails,socialmedia,reporteddata]

block_genesis = {
 'prev_hash': None,
 'transactions': data
}
block_1 = {
 'prev_hash': None,
 'transactions': data
}
block_2 = {
 'prev_hash': None,
 'transactions': data
}

print("Original hash:")
h1=hash_blocks([block_genesis, block_1, block_2])
for i in range(len(h1)):
    print("Block ",i,": ",h1[i])
    
print("Tampering the data")
block_1['transactions'][3] = []

print("Tampered hash:")
h2=hash_blocks([block_genesis, block_1, block_2])
for i in range(len(h2)):
    print("Block ",i,": ",h2[i])
    
for i in range(min(len(h1),len(h2))):
    if h1[i]!=h2[i]:
        print("Blocks have been tampered!")
        break