def test_mineBlock(): # testing mine block
data ='test'
block = Block.mineBlock(Block.genesisBlock(),data)
assert isinstance(block, Block)
assert block.previousHash==GENESIS_DATA['hash']
assert block.data==data
assert block.hash[0:block.difficulty]=='0'*block.difficulty
def isValidLedger(ledger):
'''
validate the ledger
'''
if ledger[0] != Block.genesisBlock():
raise Exception('genesis block must be valid')
for i in range(1, len(ledger)):
block = ledger[i]
lastBlock = ledger[i - 1]
Block.isValidBlock(lastBlock, block)
def lastBlock():
return Block.genesisBlock()
def __init__(self):
self.ledger = [Block.genesisBlock()]