def valid_proof(transactions, last_hash, proof):
guess = (str(transaction.to_ordered_dict()
for transaction in transactions) + str(last_hash) +
str(proof)).encode()
guess_hash = hash_string_256(guess)
# print(guess_hash)
return guess_hash[0:2] == "00"
def valid_proof(transactions, last_hash, proof):
guess = (str(transactions) + str(last_hash) + str(proof)).encode()
print(guess)
guess_hash = hash_string_256(guess)
print(guess_hash)
#returning only first and the second element
return guess_hash[0:2] == '00'
def valid_proof(transactions, last_hash, proof):
guess = (str(transactions) + str(last_hash) + str(proof)).encode()
guess_hash = hash_string_256(guess)
print(guess_hash)
return guess_hash[0:2] == '00'
def valid_proof(transactions, last_hash, proof):
guess = (str([tx.to_ordered_dict() for tx in transactions]) +
str(last_hash) + str(proof)).encode()
guess_hash = hash_util.hash_string_256(guess)
return guess_hash[
0:
2] == '00' # If generated hash has two leading 0's, it is valid. The condition can be changed.
def valid_proof(self, transactions, last_hash, proof):
#Create a string with all the hash inputs
guess = (str([tx.to_ordered_dict() for tx in transactions]) +
str(last_hash) + str(proof)).encode()
#Hash the string
guess_hash = hash_string_256(guess)
return guess_hash[0:2] == '00'
def valid_proof(transactions, last_hash, proof):
guess = (str([tx.to_ordered_dict() for tx in transactions]) +
str(last_hash) + str(proof)).encode()
# print(guess)
guess_hash = hash_string_256(guess)
# print(guess_hash)
#returning only first and the second element
return guess_hash[0:2] == '00'
def valid_proof(transactions, last_hash, proof):
"""Check: Only a hash with "00" is valid"""
#concertinate all of it together as string and encode in order to get a proper UTF8 string
guess = (str(transactions) + str(last_hash) + str(proof)).encode()
#hash that guess
guess_hash = hash_string_256(guess)
print(guess_hash)
#check that the hash starts with two zeros
return guess_hash[0:2] == "00"
def valid_proof(transactions, last_hash, proof):
# Create a string with all the hash inputs
guess = (str([tx.to_ordered_dict() for tx in transactions]) +
str(last_hash) + str(proof)).encode()
#Hash the string
# This is NOT the same hash as will be stored in the previous_hash
guess_hash = hash_string_256(guess)
print(guess_hash)
return guess_hash[0:2] == '00'
def valid_proof(transactions, last_hash, proof):
# Create a string with all the hash inputs
guess = (str([tx.to_ordered_dict() for tx in transactions]) +
str(last_hash) + str(proof)).encode()
# Hash the string
# IMPORTANT: This is NOT the same hash that will be stored in the previous_hash
guess_hash = hash_string_256(guess)
# Only a hash (which is based on the above inputs) which starts with two zeroes will be accepted
# This condition is of course defined by you. You could also require 10 leading zeroes in hash
return guess_hash[0:2] == '00'
def valid_proof(transactions, last_hash, proof):
"""Validate a proof of work number and see if it solves the puzzle algorithm (two leading 0s)
Arguments:
:transactions: The transactions of the block for which the proof is created.
:last_hash: The previous block's hash which will be stored in the current block.
:proof: The proof number we're testing.
"""
# Create a string with all the hash inputs
guess = (str(transactions) + str(last_hash) + str(proof)).encode()
# Hash the string
# IMPORTANT: This is NOT the same hash as will be stored in the previous_hash. It's a not a block's hash. It's only used for the proof-of-work algorithm.
guess_hash = hash_string_256(guess)
# Only a hash (which is based on the above inputs) which starts with two 0s is treated as valid
# This condition is of course defined by you. You could also require 10 leading 0s - this would take significantly longer (and this allows you to control the speed at which new blocks can be added)
return guess_hash[0:2] == '00'
def valid_proof(transactions, last_hash, proof):
"""Validate a proof of work number and see if it solves the puzzle algorithm
Arguments:
:transactions: The transactions of the block for which the proof is calculated.
:last_hash: The previous block's hash which will be stored.
:proof: The proof number we're testing.
"""
# Create a string with all the hash inputs
guess = (str(transactions) + str(last_hash) + str(proof)).encode()
# Hash the string
# IMPORTANT: This is NOT the the same hash as will be stored int the previous block
guess_hash = hash_string_256(guess)
# Only a hash which starts with two zeros will return True.
# This condition is of course defined by you.
return guess_hash[0:2] == '00'
def valid_proof(transactions, last_hash, proof):
"""validate a proof of work numberand see if it solves a puzzle algorithm (two leading 0's)
Arguements:
:transactions: the transactions of block where proof is created
:last_hash: previous hash will be stored in current block
:proof: the proof number we are testing
"""
#create a string with all hash inputs
guess = (str(transactions) + str(last_hash) + str(proof)).encode()
#hash the string
#this is not same as previous hash its only used for proof of work algo
guess_hash = hash_string_256(guess)
print(guess_hash)
# Only a hash (which is based on the above inputs) which starts with two 0s is treated as valid
# This condition is of course defined by you.
# You could also require 10 leading 0s - this would take significantly longer
# (and this allows you to control the speed at which new blocks can be added)
return guess_hash[0:2] == '00'
def validTarget(transactions, last_hash, proof):
guess = (str(transactions) + str(last_hash) + str(proof)).encode()
guess_hash = hash_string_256(guess)
return guess_hash
def validProof(transactions):
guess = (str(transactions)).encode()
guess_hash = hash_string_256(guess)
return guess_hash
def valid_proof(transactions, last_hash, proof_number):
guess = (str(transactions) + str(last_hash) + str(proof_number)).encode()
guess_hash = hash_string_256(guess)
return guess_hash[0:2] == "00"
def valid_proof(transactions, last_hash, proof):
guess = (str(transactions) + str(last_hash) + str(proof)).encode()
# This hashing is used for Proof of work Algo
guess_hash = hash_string_256(guess)
# Only a hash (which is based on the above inputs) which starts with two 0s is treated as valid
return guess_hash[0:2] == '00'
def valid_proof(transactions, last_hash, proof):
guess = (str([tx.to_ordered_dict() for tx in transactions]) + str(last_hash)+ str(proof)).encode()
guess_hash = hash_string_256(guess)
return guess_hash[0:2] == '00'
def valid_proof(transactions, last_hash, proof):
''' confirms proof: small enough number from the hashing function '''
guess = (str(transactions) + str(last_hash) + str(proof)).encode()
guess_hash = hash_string_256(guess) # this is not the hash of the last block! This is the pow # attempting to solve the puzzle!
print(guess_hash) # typically prints out loads of hashes
return guess_hash[0:2] == '00' # truth condition for a valid hash
def valid_proof(transactions,last_hash,proof):
# be carefull while passing the arguments make sure hashing will cause issue for the same item (list or string matters!!str([tx....]))
guess = (str([tx.to_ordered_dict() for tx in transactions])+ str(last_hash)+str(proof)).encode()
guess_hash = hash_string_256(guess)
print(guess_hash)
return guess_hash[0:2]=='00'
