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blockchainpy.py

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+import json
+from hashlib import sha256
+
+class BlockchainError(Exception): pass
+
+class blockchain:
+    def __init__(self):
+        self.blockchain=[]
+        self.transactionbyffer=[]
+    def newgenesis(self, data):
+        if len(self.blockchain)==0:
+            temp={"id":0, "data":data, "transactions":[], "roothash":0}
+            temp0=json.dumps(temp)
+            temp0=sha256(temp0.encode()).hexdigest()
+            temp["hash"]=temp0
+            self.blockchain.append(temp)
+        else:
+            raise BlockchainError()
+    def setbc(self, bc):
+        self.blockchain=bc
+    def addtx(self, data):
+        self.transactionbyffer.append(data)
+    def newblock(self, data):
+        temp0={"id":len(self.blockchain), "data":data, "transactions":json.dumps(self.transactionbyffer), "roothash":self.blockchain[len(self.blockchain)-1]["hash"]}
+        temp1=json.dumps(temp0)
+        temp1=sha256(temp1.encode()).hexdigest()
+        temp0["hash"]=temp1
+        self.blockchain.append(temp0)
+        self.transactionbyffer=[]
+    def checkblocks(self):
+        correct=1
+        index=0
+        for block in self.blockchain:
+            temp0=json.dumps({"id":block["id"], "data":block["data"], "transactions":block["transactions"], "roothash":block["roothash"]})
+            temp0=sha256(temp0.encode()).hexdigest()
+            if block["id"]!=self.blockchain[block["id"]]["id"]:
+                correct=0
+            if block["id"]!=0:
+                if self.blockchain[block["id"]-1]["hash"]!=block["roothash"]:
+                    correct=0
+            if block["hash"]!=temp0:
+                correct=0
+            index=index+1
+        return correct
+