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import hashlib as hasher | |
import datetime as date | |
# Define what a Snakecoin block is | |
class Block: | |
def __init__(self, index, timestamp, data, previous_hash): | |
self.index = index | |
self.timestamp = timestamp | |
self.data = data | |
self.previous_hash = previous_hash |
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pragma solidity ^0.4.19; | |
contract ERC721 { | |
string constant private tokenName = "My ERC721 Token"; | |
string constant private tokenSymbol = "MET"; | |
uint256 constant private totalTokens = 1000000; | |
mapping(address => uint) private balances; | |
mapping(uint256 => address) private tokenOwners; | |
mapping(uint256 => bool) private tokenExists; | |
mapping(address => mapping (address => uint256)) private allowed; | |
mapping(address => mapping(uint256 => uint256)) private ownerTokens; |
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from flask import Flask | |
from flask import request | |
import json | |
import requests | |
import hashlib as hasher | |
import datetime as date | |
node = Flask(__name__) | |
# Define what a Snakecoin block is | |
class Block: |
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@node.route('/blocks', methods=['GET']) | |
def get_blocks(): | |
chain_to_send = blockchain | |
# Convert our blocks into dictionaries | |
# so we can send them as json objects later | |
for block in chain_to_send: | |
block_index = str(block.index) | |
block_timestamp = str(block.timestamp) | |
block_data = str(block.data) | |
block_hash = block.hash |
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from flask import Flask | |
from flask import request | |
node = Flask(__name__) | |
# Store the transactions that | |
# this node has in a list | |
this_nodes_transactions = [] | |
@node.route('/txion', methods=['POST']) | |
def transaction(): |
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{ | |
"from": "71238uqirbfh894-random-public-key-a-alkjdflakjfewn204ij", | |
"to": "93j4ivnqiopvh43-random-public-key-b-qjrgvnoeirbnferinfo", | |
"amount": 3 | |
} |
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# Create the blockchain and add the genesis block | |
blockchain = [create_genesis_block()] | |
previous_block = blockchain[0] | |
# How many blocks should we add to the chain | |
# after the genesis block | |
num_of_blocks_to_add = 20 | |
# Add blocks to the chain | |
for i in range(0, num_of_blocks_to_add): |
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def next_block(last_block): | |
this_index = last_block.index + 1 | |
this_timestamp = date.datetime.now() | |
this_data = "Hey! I'm block " + str(this_index) | |
this_hash = last_block.hash | |
return Block(this_index, this_timestamp, this_data, this_hash) |
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import datetime as date | |
def create_genesis_block(): | |
# Manually construct a block with | |
# index zero and arbitrary previous hash | |
return Block(0, date.datetime.now(), "Genesis Block", "0") |
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import hashlib as hasher | |
class Block: | |
def __init__(self, index, timestamp, data, previous_hash): | |
self.index = index | |
self.timestamp = timestamp | |
self.data = data | |
self.previous_hash = previous_hash | |
self.hash = self.hash_block() | |
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