用Python实现简单的区块链系统1

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用Python实现简单的区块链系统1
󰒅󰤐󰤕󰮞󰰟󰉁Python󰇠󰑭󰋒󰰟󰓏󰔚󰫑󰤫󰥊󰰟󰋒󰔏
󰇹
󰴒󰣾󰤕󰰟󰋒
󰰟󰋒󰨙󰂁󰅺󰧗󰋒󰄊
󰄊󰪭P2P󰥊󰑳󰑖󰤨󰑳󰋒󰉁󰙵󰋐󰏡
󰴒󰣾󰤕󰋒
󰤕󰌂󰍄󰋒󰕲
https://www.zhihu.com/question/26762707
󰴒󰣾󰤕HTTP󰋒󰇹
󰋒󰥟󰙵󰢩󰋐󰦶
󰣑HTTP󰤴󰋒󰐳
Postman󰖰cURL
󰴒󰣾󰣑Python3.6+󰑖
󰴯󰋒󰐮󰚴"5󰕌󰥓Python"󰥨󰔂󰤷󰤕
󰂁󰍒
https://github.com/dvf/blockchain
󰉁󰏠󰕌󰪬󰖰IDE󰕌Python󰏶SublineEditPlusPyCharm
VSCodeAtom󰑖
󰋴"py_blockchain_demo"󰉁󰣾󰕌󰋒python󰄱
'blockchain.py'󰋒
󰉁Python󰇠󰑭󰋒󰰟󰓏󰔚
1
2󰰟
2.1 󰫠󰰟
 Blockchain 󰒥 󰫽󰋒󰐏󰢳󰣾󰋒󰰟
󰴯󰫐󰒥󰋒
class Blockchain(object):
def __init__(self):
self.chain = []
self.current_transactions = []
def new_block(self):
# Creates a new Block and adds it to the chain
pass
def new_transaction(self):
# Adds a new transaction to the list of transactions
pass
@staticmethod
def hash(block):
# Hashes a Block
pass
@property
def last_block(self):
# Returns the last Block in the chain
pass
Blockchain 󰒥󰧏󰧒󰑶󰇹󰰟󰫏󰁓󰋒󰰟󰋒
Method󰤰󹥭
󰭘 󰓒  󰲖Unix󰲖  󰢳  󰷖(󰏷󰥨󰫠)
󰋒
󰴯Block󰋒
block = {
'index': 1,
'timestamp': 1506057125.900785,
'transactions': [
{
'sender': "8527147fe1f5426f9dd545de4b27ee00",
'recipient': "a77f5cdfa2934df3954a5c7c7da5df1f",
'amount': 5,
}
2.2 󰔏
],
'proof': 324984774000,
'previous_hash': "2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e730433
62938b9824"
}
󰫐󰄊 󰰟 󰋒󰥧󰋒 - 󰭘󰋒󰋒 
󰫐󰙸󰮠󰣾󰋒󰫐 󰰟 󰋒󰖰 󰰟 󰪟󰋒
󰔦󰎀󰋒󹥫
󰫐󰬓󰇹 󰫏󰫸󰛑󰄊󰲖󰔂󰖮 - 󰫐󰰟󰘈󰋒󰇹
󰴒󰣾󰁓󰋒󰋒 new_transaction()󰋒󰧒󰫐
󰴬󰋒󰑭:
class Blockchain(object):
...
def new_transaction(self, sender, recipient, amount):
"""
Creates a new transaction to go into the next mined Block
:param sender: <str> Address of the Sender
:param recipient: <str> Address of the Recipient
:param amount: <int> Amount
:return: <int> The index of the Block that will hold this transactio
n
"""
self.current_transactions.append({
'sender': sender,
'recipient': recipient,
'amount': amount,
})
return self.last_block['index'] + 1
new_transaction() 󰁓󰢳󰫍󰣊󰁓󰋒󰋒󰓒---󰤷󰮜
󰫐󰏷󰋒󰉁󰉁
󰋒 Blockchain 󰣊󰴒󰣾  󰋒󰁓󰫑
󰫑󰫏󰴒󰣾󰋒󰨙󰂁󰁓 󰥅󰫐󰍐󰋒󰔏(󰥅) 󰏷
2.3 󰁓
2.4 󰋒
󰥨󰔂󰤯󰤿󰍐
󰳜󰫽  󰫏󰢲 new_block() new_transaction()
hash() 
import hashlib
import json
from time import time
class Blockchain(object):
def __init__(self):
self.current_transactions = []
self.chain = []
#

self.new_block(previous_hash=1, proof=100)
def new_block(self, proof, previous_hash=None):
"""
󰋒󰰟
:param proof: <int> 󰉈󰥅󰑳󰈿󰋒󰥅
:param previous_hash: (Optional) <str> 󰋒 hash 󹥫
:return: <dict> 
"""
block = {
'index': len(self.chain) + 1,
'timestamp': time(),
'transactions': self.current_transactions,
'proof': proof,
'previous_hash': previous_hash or self.hash(self.chain[-1]),
}
#
󰮠󰕾󰤶
self.current_transactions = []
self.chain.append(block)
return block
def new_transaction(self, sender, recipient, amount):
"""
󰑀󰋒󰣊󰋒
:param sender: <str> 󰫧󰋒
:param recipient: <str> 󰋒
:param amount: <int> 󰮣󰵱
:return: <int> 󰋒󰓒
"""

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