added all tutorials from lesson 7

period_1/07-mining/703_TX2_A02_Nonce - tamper test/TxBlock.py

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+from BlockChain import CBlock
+from Signature import generate_keys, sign, verify
+from cryptography.hazmat.primitives import hashes
+from cryptography.hazmat.backends import default_backend
+
+import random
+
+REWARD_VALUE = 25.0
+leading_zeros = 2
+next_char_limit = 20
+
+class TxBlock (CBlock):
+
+    def __init__(self, previousBlock):
+        self.nonce = "A random nonce"
+        super(TxBlock, self).__init__([], previousBlock)
+
+    def addTx(self, Tx_in):
+        self.data.append(Tx_in)
+
+    def __count_totals(self):
+        total_in = 0
+        total_out = 0
+        for tx in self.data:
+            for addr, amt in tx.inputs:
+                total_in = total_in + amt
+            for addr, amt in tx.outputs:
+                total_out = total_out + amt
+        return total_in, total_out
+
+    def is_valid(self):
+        if not super(TxBlock, self).is_valid():
+            return False
+        for tx in self.data:
+            if not tx.is_valid():
+                return False
+        
+        total_in, total_out = self.__count_totals()
+        
+        Tx_Balance = round(total_out - total_in, 10)
+        
+        if  Tx_Balance > REWARD_VALUE:
+            return False
+        return True
+
+    def good_nonce(self):
+        return False
+
+    def find_nonce(self):
+        return None