├── .gitattributes ├── .gitignore ├── .travis.yml ├── Dockerfile ├── LICENSE ├── Pipfile ├── Pipfile.lock ├── README.md ├── blockchain.py ├── csharp ├── BlockChain.Console │ ├── App.config │ ├── BlockChain.Console.csproj │ ├── Program.cs │ └── Properties │ │ └── AssemblyInfo.cs ├── BlockChain.sln └── BlockChain │ ├── Block.cs │ ├── BlockChain.cs │ ├── BlockChain.csproj │ ├── Node.cs │ ├── Properties │ └── AssemblyInfo.cs │ ├── Transaction.cs │ ├── WebServer.cs │ └── packages.config ├── js ├── blockchain.js ├── index.js ├── package-lock.json └── package.json ├── requirements.txt └── tests ├── __init__.py └── test_blockchain.py /.gitattributes: -------------------------------------------------------------------------------- 1 | ############################################################################### 2 | # Set default behavior to automatically normalize line endings. 3 | ############################################################################### 4 | * text=auto 5 | 6 | ############################################################################### 7 | # Set default behavior for command prompt diff. 8 | # 9 | # This is need for earlier builds of msysgit that does not have it on by 10 | # default for csharp files. 11 | # Note: This is only used by command line 12 | ############################################################################### 13 | #*.cs diff=csharp 14 | 15 | ############################################################################### 16 | # Set the merge driver for project and solution files 17 | # 18 | # Merging from the command prompt will add diff markers to the files if there 19 | # are conflicts (Merging from VS is not affected by the settings below, in VS 20 | # the diff markers are never inserted). Diff markers may cause the following 21 | # file extensions to fail to load in VS. An alternative would be to treat 22 | # these files as binary and thus will always conflict and require user 23 | # intervention with every merge. To do so, just uncomment the entries below 24 | ############################################################################### 25 | #*.sln merge=binary 26 | #*.csproj merge=binary 27 | #*.vbproj merge=binary 28 | #*.vcxproj merge=binary 29 | #*.vcproj merge=binary 30 | #*.dbproj merge=binary 31 | #*.fsproj merge=binary 32 | #*.lsproj merge=binary 33 | #*.wixproj merge=binary 34 | #*.modelproj merge=binary 35 | #*.sqlproj merge=binary 36 | #*.wwaproj merge=binary 37 | 38 | ############################################################################### 39 | # behavior for image files 40 | # 41 | # image files are treated as binary by default. 42 | ############################################################################### 43 | #*.jpg binary 44 | #*.png binary 45 | #*.gif binary 46 | 47 | ############################################################################### 48 | # diff behavior for common document formats 49 | # 50 | # Convert binary document formats to text before diffing them. This feature 51 | # is only available from the command line. Turn it on by uncommenting the 52 | # entries below. 53 | ############################################################################### 54 | #*.doc diff=astextplain 55 | #*.DOC diff=astextplain 56 | #*.docx diff=astextplain 57 | #*.DOCX diff=astextplain 58 | #*.dot diff=astextplain 59 | #*.DOT diff=astextplain 60 | #*.pdf diff=astextplain 61 | #*.PDF diff=astextplain 62 | #*.rtf diff=astextplain 63 | #*.RTF diff=astextplain 64 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # Byte-compiled / optimized / DLL files 2 | __pycache__/ 3 | *.py[cod] 4 | *$py.class 5 | 6 | # C extensions 7 | *.so 8 | 9 | # Distribution / packaging 10 | .Python 11 | env/ 12 | build/ 13 | develop-eggs/ 14 | dist/ 15 | downloads/ 16 | eggs/ 17 | .eggs/ 18 | lib/ 19 | lib64/ 20 | parts/ 21 | sdist/ 22 | var/ 23 | wheels/ 24 | *.egg-info/ 25 | .installed.cfg 26 | *.egg 27 | 28 | # PyInstaller 29 | # Usually these files are written by a python script from a template 30 | # before PyInstaller builds the exe, so as to inject date/other infos into it. 31 | *.manifest 32 | *.spec 33 | 34 | # Installer logs 35 | pip-log.txt 36 | pip-delete-this-directory.txt 37 | 38 | # Unit test / coverage reports 39 | htmlcov/ 40 | .tox/ 41 | .coverage 42 | .coverage.* 43 | .cache 44 | nosetests.xml 45 | coverage.xml 46 | *.cover 47 | .hypothesis/ 48 | 49 | # Translations 50 | *.mo 51 | *.pot 52 | 53 | # Django stuff: 54 | *.log 55 | local_settings.py 56 | 57 | # Flask stuff: 58 | instance/ 59 | .webassets-cache 60 | 61 | # Scrapy stuff: 62 | .scrapy 63 | 64 | # Sphinx documentation 65 | docs/_build/ 66 | 67 | # PyBuilder 68 | target/ 69 | 70 | # Jupyter Notebook 71 | .ipynb_checkpoints 72 | 73 | # pyenv 74 | .python-version 75 | 76 | # celery beat schedule file 77 | celerybeat-schedule 78 | 79 | # SageMath parsed files 80 | *.sage.py 81 | 82 | # dotenv 83 | .env 84 | 85 | # virtualenv 86 | .venv 87 | venv/ 88 | ENV/ 89 | 90 | # Spyder project settings 91 | .spyderproject 92 | .spyproject 93 | 94 | # Rope project settings 95 | .ropeproject 96 | 97 | # mkdocs documentation 98 | /site 99 | 100 | # mypy 101 | .mypy_cache/ 102 | 103 | # PyCharm 104 | .idea/ 105 | 106 | node_modules/ 107 | -------------------------------------------------------------------------------- /.travis.yml: -------------------------------------------------------------------------------- 1 | language: python 2 | 3 | python: 4 | - 3.6 5 | - nightly 6 | 7 | install: 8 | - pip install pipenv 9 | - pipenv install --dev 10 | 11 | script: 12 | - pipenv run python -m unittest 13 | -------------------------------------------------------------------------------- /Dockerfile: -------------------------------------------------------------------------------- 1 | FROM python:3.6-alpine 2 | 3 | WORKDIR /app 4 | 5 | # Install dependencies. 6 | ADD requirements.txt /app 7 | RUN cd /app && \ 8 | pip install -r requirements.txt 9 | 10 | # Add actual source code. 11 | ADD blockchain.py /app 12 | 13 | EXPOSE 5000 14 | 15 | CMD ["python", "blockchain.py", "--port", "5000"] 16 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2017 Daniel van Flymen 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /Pipfile: -------------------------------------------------------------------------------- 1 | [[source]] 2 | url = "https://pypi.python.org/simple" 3 | verify_ssl = true 4 | name = "pypi" 5 | 6 | [dev-packages] 7 | 8 | [requires] 9 | python_version = "3.6" 10 | 11 | [packages] 12 | 13 | flask = "==0.12.2" 14 | requests = "==2.18.4" 15 | 16 | -------------------------------------------------------------------------------- /Pipfile.lock: -------------------------------------------------------------------------------- 1 | { 2 | "_meta": { 3 | "hash": { 4 | "sha256": "45af71184b5b013f58a8601f7f87c9f0b882afe19f197ce45d6d08e46d615159" 5 | }, 6 | "host-environment-markers": { 7 | "implementation_name": "cpython", 8 | "implementation_version": "3.6.2", 9 | "os_name": "posix", 10 | "platform_machine": "x86_64", 11 | "platform_python_implementation": "CPython", 12 | "platform_release": "4.10.0-35-generic", 13 | "platform_system": "Linux", 14 | "platform_version": "#39~16.04.1-Ubuntu SMP Wed Sep 13 09:02:42 UTC 2017", 15 | "python_full_version": "3.6.2", 16 | "python_version": "3.6", 17 | "sys_platform": "linux" 18 | }, 19 | "pipfile-spec": 6, 20 | "requires": { 21 | "python_version": "3.6" 22 | }, 23 | "sources": [ 24 | { 25 | "name": "pypi", 26 | "url": "https://pypi.python.org/simple", 27 | "verify_ssl": true 28 | } 29 | ] 30 | }, 31 | "default": { 32 | "certifi": { 33 | "hashes": [ 34 | "sha256:54a07c09c586b0e4c619f02a5e94e36619da8e2b053e20f594348c0611803704", 35 | "sha256:40523d2efb60523e113b44602298f0960e900388cf3bb6043f645cf57ea9e3f5" 36 | ], 37 | "version": "==2017.7.27.1" 38 | }, 39 | "chardet": { 40 | "hashes": [ 41 | "sha256:fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691", 42 | "sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae" 43 | ], 44 | "version": "==3.0.4" 45 | }, 46 | "click": { 47 | "hashes": [ 48 | "sha256:29f99fc6125fbc931b758dc053b3114e55c77a6e4c6c3a2674a2dc986016381d", 49 | "sha256:f15516df478d5a56180fbf80e68f206010e6d160fc39fa508b65e035fd75130b" 50 | ], 51 | "version": "==6.7" 52 | }, 53 | "flask": { 54 | "hashes": [ 55 | "sha256:0749df235e3ff61ac108f69ac178c9770caeaccad2509cb762ce1f65570a8856", 56 | "sha256:49f44461237b69ecd901cc7ce66feea0319b9158743dd27a2899962ab214dac1" 57 | ], 58 | "version": "==0.12.2" 59 | }, 60 | "idna": { 61 | "hashes": [ 62 | "sha256:8c7309c718f94b3a625cb648ace320157ad16ff131ae0af362c9f21b80ef6ec4", 63 | "sha256:2c6a5de3089009e3da7c5dde64a141dbc8551d5b7f6cf4ed7c2568d0cc520a8f" 64 | ], 65 | "version": "==2.6" 66 | }, 67 | "itsdangerous": { 68 | "hashes": [ 69 | "sha256:cbb3fcf8d3e33df861709ecaf89d9e6629cff0a217bc2848f1b41cd30d360519" 70 | ], 71 | "version": "==0.24" 72 | }, 73 | "jinja2": { 74 | "hashes": [ 75 | "sha256:2231bace0dfd8d2bf1e5d7e41239c06c9e0ded46e70cc1094a0aa64b0afeb054", 76 | "sha256:ddaa01a212cd6d641401cb01b605f4a4d9f37bfc93043d7f760ec70fb99ff9ff" 77 | ], 78 | "version": "==2.9.6" 79 | }, 80 | "markupsafe": { 81 | "hashes": [ 82 | "sha256:a6be69091dac236ea9c6bc7d012beab42010fa914c459791d627dad4910eb665" 83 | ], 84 | "version": "==1.0" 85 | }, 86 | "requests": { 87 | "hashes": [ 88 | "sha256:6a1b267aa90cac58ac3a765d067950e7dbbf75b1da07e895d1f594193a40a38b", 89 | "sha256:9c443e7324ba5b85070c4a818ade28bfabedf16ea10206da1132edaa6dda237e" 90 | ], 91 | "version": "==2.18.4" 92 | }, 93 | "urllib3": { 94 | "hashes": [ 95 | "sha256:06330f386d6e4b195fbfc736b297f58c5a892e4440e54d294d7004e3a9bbea1b", 96 | "sha256:cc44da8e1145637334317feebd728bd869a35285b93cbb4cca2577da7e62db4f" 97 | ], 98 | "version": "==1.22" 99 | }, 100 | "werkzeug": { 101 | "hashes": [ 102 | "sha256:e8549c143af3ce6559699a01e26fa4174f4c591dbee0a499f3cd4c3781cdec3d", 103 | "sha256:903a7b87b74635244548b30d30db4c8947fe64c5198f58899ddcd3a13c23bb26" 104 | ], 105 | "version": "==0.12.2" 106 | } 107 | }, 108 | "develop": {} 109 | } 110 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Are you looking for the source code for my book? 2 | 3 | Please find it here: https://github.com/dvf/blockchain-book 4 | 5 | The book is available on Amazon: https://www.amazon.com/Learn-Blockchain-Building-Understanding-Cryptocurrencies/dp/1484251709 6 | 7 | # Learn Blockchains by Building One 8 | 9 | [![Build Status](https://travis-ci.org/dvf/blockchain.svg?branch=master)](https://travis-ci.org/dvf/blockchain) 10 | 11 | This is the source code for my post on [Building a Blockchain](https://medium.com/p/117428612f46). 12 | 13 | ## Installation 14 | 15 | 1. Make sure [Python 3.6+](https://www.python.org/downloads/) is installed. 16 | 2. Install [pipenv](https://github.com/kennethreitz/pipenv). 17 | 18 | ``` 19 | $ pip install pipenv 20 | ``` 21 | 3. Install requirements 22 | ``` 23 | $ pipenv install 24 | ``` 25 | 26 | 4. Run the server: 27 | * `$ pipenv run python blockchain.py` 28 | * `$ pipenv run python blockchain.py -p 5001` 29 | * `$ pipenv run python blockchain.py --port 5002` 30 | 31 | ## Docker 32 | 33 | Another option for running this blockchain program is to use Docker. Follow the instructions below to create a local Docker container: 34 | 35 | 1. Clone this repository 36 | 2. Build the docker container 37 | 38 | ``` 39 | $ docker build -t blockchain . 40 | ``` 41 | 42 | 3. Run the container 43 | 44 | ``` 45 | $ docker run --rm -p 80:5000 blockchain 46 | ``` 47 | 48 | 4. To add more instances, vary the public port number before the colon: 49 | 50 | ``` 51 | $ docker run --rm -p 81:5000 blockchain 52 | $ docker run --rm -p 82:5000 blockchain 53 | $ docker run --rm -p 83:5000 blockchain 54 | ``` 55 | 56 | ## Installation (C# Implementation) 57 | 58 | 1. Install a free copy of Visual Studio IDE (Community Edition): 59 | https://www.visualstudio.com/vs/ 60 | 61 | 2. Once installed, open the solution file (BlockChain.sln) using the File > Open > Project/Solution menu options within Visual Studio. 62 | 63 | 3. From within the "Solution Explorer", right click the BlockChain.Console project and select the "Set As Startup Project" option. 64 | 65 | 4. Click the "Start" button, or hit F5 to run. The program executes in a console window, and is controlled via HTTP with the same commands as the Python version. 66 | 67 | 68 | ## Contributing 69 | 70 | Contributions are welcome! Please feel free to submit a Pull Request. 71 | 72 | -------------------------------------------------------------------------------- /blockchain.py: -------------------------------------------------------------------------------- 1 | import hashlib 2 | import json 3 | from time import time 4 | from urllib.parse import urlparse 5 | from uuid import uuid4 6 | 7 | import requests 8 | from flask import Flask, jsonify, request 9 | 10 | 11 | class Blockchain: 12 | def __init__(self): 13 | self.current_transactions = [] 14 | self.chain = [] 15 | self.nodes = set() 16 | 17 | # Create the genesis block 18 | self.new_block(previous_hash='1', proof=100) 19 | 20 | def register_node(self, address): 21 | """ 22 | Add a new node to the list of nodes 23 | 24 | :param address: Address of node. Eg. 'http://192.168.0.5:5000' 25 | """ 26 | 27 | parsed_url = urlparse(address) 28 | if parsed_url.netloc: 29 | self.nodes.add(parsed_url.netloc) 30 | elif parsed_url.path: 31 | # Accepts an URL without scheme like '192.168.0.5:5000'. 32 | self.nodes.add(parsed_url.path) 33 | else: 34 | raise ValueError('Invalid URL') 35 | 36 | 37 | def valid_chain(self, chain): 38 | """ 39 | Determine if a given blockchain is valid 40 | 41 | :param chain: A blockchain 42 | :return: True if valid, False if not 43 | """ 44 | 45 | last_block = chain[0] 46 | current_index = 1 47 | 48 | while current_index < len(chain): 49 | block = chain[current_index] 50 | print(f'{last_block}') 51 | print(f'{block}') 52 | print("\n-----------\n") 53 | # Check that the hash of the block is correct 54 | last_block_hash = self.hash(last_block) 55 | if block['previous_hash'] != last_block_hash: 56 | return False 57 | 58 | # Check that the Proof of Work is correct 59 | if not self.valid_proof(last_block['proof'], block['proof'], last_block_hash): 60 | return False 61 | 62 | last_block = block 63 | current_index += 1 64 | 65 | return True 66 | 67 | def resolve_conflicts(self): 68 | """ 69 | This is our consensus algorithm, it resolves conflicts 70 | by replacing our chain with the longest one in the network. 71 | 72 | :return: True if our chain was replaced, False if not 73 | """ 74 | 75 | neighbours = self.nodes 76 | new_chain = None 77 | 78 | # We're only looking for chains longer than ours 79 | max_length = len(self.chain) 80 | 81 | # Grab and verify the chains from all the nodes in our network 82 | for node in neighbours: 83 | response = requests.get(f'http://{node}/chain') 84 | 85 | if response.status_code == 200: 86 | length = response.json()['length'] 87 | chain = response.json()['chain'] 88 | 89 | # Check if the length is longer and the chain is valid 90 | if length > max_length and self.valid_chain(chain): 91 | max_length = length 92 | new_chain = chain 93 | 94 | # Replace our chain if we discovered a new, valid chain longer than ours 95 | if new_chain: 96 | self.chain = new_chain 97 | return True 98 | 99 | return False 100 | 101 | def new_block(self, proof, previous_hash): 102 | """ 103 | Create a new Block in the Blockchain 104 | 105 | :param proof: The proof given by the Proof of Work algorithm 106 | :param previous_hash: Hash of previous Block 107 | :return: New Block 108 | """ 109 | 110 | block = { 111 | 'index': len(self.chain) + 1, 112 | 'timestamp': time(), 113 | 'transactions': self.current_transactions, 114 | 'proof': proof, 115 | 'previous_hash': previous_hash or self.hash(self.chain[-1]), 116 | } 117 | 118 | # Reset the current list of transactions 119 | self.current_transactions = [] 120 | 121 | self.chain.append(block) 122 | return block 123 | 124 | def new_transaction(self, sender, recipient, amount): 125 | """ 126 | Creates a new transaction to go into the next mined Block 127 | 128 | :param sender: Address of the Sender 129 | :param recipient: Address of the Recipient 130 | :param amount: Amount 131 | :return: The index of the Block that will hold this transaction 132 | """ 133 | self.current_transactions.append({ 134 | 'sender': sender, 135 | 'recipient': recipient, 136 | 'amount': amount, 137 | }) 138 | 139 | return self.last_block['index'] + 1 140 | 141 | @property 142 | def last_block(self): 143 | return self.chain[-1] 144 | 145 | @staticmethod 146 | def hash(block): 147 | """ 148 | Creates a SHA-256 hash of a Block 149 | 150 | :param block: Block 151 | """ 152 | 153 | # We must make sure that the Dictionary is Ordered, or we'll have inconsistent hashes 154 | block_string = json.dumps(block, sort_keys=True).encode() 155 | return hashlib.sha256(block_string).hexdigest() 156 | 157 | def proof_of_work(self, last_block): 158 | """ 159 | Simple Proof of Work Algorithm: 160 | 161 | - Find a number p' such that hash(pp') contains leading 4 zeroes 162 | - Where p is the previous proof, and p' is the new proof 163 | 164 | :param last_block: last Block 165 | :return: 166 | """ 167 | 168 | last_proof = last_block['proof'] 169 | last_hash = self.hash(last_block) 170 | 171 | proof = 0 172 | while self.valid_proof(last_proof, proof, last_hash) is False: 173 | proof += 1 174 | 175 | return proof 176 | 177 | @staticmethod 178 | def valid_proof(last_proof, proof, last_hash): 179 | """ 180 | Validates the Proof 181 | 182 | :param last_proof: Previous Proof 183 | :param proof: Current Proof 184 | :param last_hash: The hash of the Previous Block 185 | :return: True if correct, False if not. 186 | 187 | """ 188 | 189 | guess = f'{last_proof}{proof}{last_hash}'.encode() 190 | guess_hash = hashlib.sha256(guess).hexdigest() 191 | return guess_hash[:4] == "0000" 192 | 193 | 194 | # Instantiate the Node 195 | app = Flask(__name__) 196 | 197 | # Generate a globally unique address for this node 198 | node_identifier = str(uuid4()).replace('-', '') 199 | 200 | # Instantiate the Blockchain 201 | blockchain = Blockchain() 202 | 203 | 204 | @app.route('/mine', methods=['GET']) 205 | def mine(): 206 | # We run the proof of work algorithm to get the next proof... 207 | last_block = blockchain.last_block 208 | proof = blockchain.proof_of_work(last_block) 209 | 210 | # We must receive a reward for finding the proof. 211 | # The sender is "0" to signify that this node has mined a new coin. 212 | blockchain.new_transaction( 213 | sender="0", 214 | recipient=node_identifier, 215 | amount=1, 216 | ) 217 | 218 | # Forge the new Block by adding it to the chain 219 | previous_hash = blockchain.hash(last_block) 220 | block = blockchain.new_block(proof, previous_hash) 221 | 222 | response = { 223 | 'message': "New Block Forged", 224 | 'index': block['index'], 225 | 'transactions': block['transactions'], 226 | 'proof': block['proof'], 227 | 'previous_hash': block['previous_hash'], 228 | } 229 | return jsonify(response), 200 230 | 231 | 232 | @app.route('/transactions/new', methods=['POST']) 233 | def new_transaction(): 234 | values = request.get_json() 235 | 236 | # Check that the required fields are in the POST'ed data 237 | required = ['sender', 'recipient', 'amount'] 238 | if not all(k in values for k in required): 239 | return 'Missing values', 400 240 | 241 | # Create a new Transaction 242 | index = blockchain.new_transaction(values['sender'], values['recipient'], values['amount']) 243 | 244 | response = {'message': f'Transaction will be added to Block {index}'} 245 | return jsonify(response), 201 246 | 247 | 248 | @app.route('/chain', methods=['GET']) 249 | def full_chain(): 250 | response = { 251 | 'chain': blockchain.chain, 252 | 'length': len(blockchain.chain), 253 | } 254 | return jsonify(response), 200 255 | 256 | 257 | @app.route('/nodes/register', methods=['POST']) 258 | def register_nodes(): 259 | values = request.get_json() 260 | 261 | nodes = values.get('nodes') 262 | if nodes is None: 263 | return "Error: Please supply a valid list of nodes", 400 264 | 265 | for node in nodes: 266 | blockchain.register_node(node) 267 | 268 | response = { 269 | 'message': 'New nodes have been added', 270 | 'total_nodes': list(blockchain.nodes), 271 | } 272 | return jsonify(response), 201 273 | 274 | 275 | @app.route('/nodes/resolve', methods=['GET']) 276 | def consensus(): 277 | replaced = blockchain.resolve_conflicts() 278 | 279 | if replaced: 280 | response = { 281 | 'message': 'Our chain was replaced', 282 | 'new_chain': blockchain.chain 283 | } 284 | else: 285 | response = { 286 | 'message': 'Our chain is authoritative', 287 | 'chain': blockchain.chain 288 | } 289 | 290 | return jsonify(response), 200 291 | 292 | 293 | if __name__ == '__main__': 294 | from argparse import ArgumentParser 295 | 296 | parser = ArgumentParser() 297 | parser.add_argument('-p', '--port', default=5000, type=int, help='port to listen on') 298 | args = parser.parse_args() 299 | port = args.port 300 | 301 | app.run(host='0.0.0.0', port=port) 302 | -------------------------------------------------------------------------------- /csharp/BlockChain.Console/App.config: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | -------------------------------------------------------------------------------- /csharp/BlockChain.Console/BlockChain.Console.csproj: -------------------------------------------------------------------------------- 1 |  2 | 3 | 4 | 5 | Debug 6 | AnyCPU 7 | {D0C795A0-6F20-4A8E-BE44-801678754DA4} 8 | Exe 9 | BlockChainDemo.Console 10 | BlockChainDemo.Console 11 | v4.5.1 12 | 512 13 | true 14 | SAK 15 | SAK 16 | SAK 17 | SAK 18 | 19 | 20 | 21 | AnyCPU 22 | true 23 | full 24 | false 25 | bin\Debug\ 26 | DEBUG;TRACE 27 | prompt 28 | 4 29 | 30 | 31 | AnyCPU 32 | pdbonly 33 | true 34 | bin\Release\ 35 | TRACE 36 | prompt 37 | 4 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | {e06fc4ce-77d0-4a64-94a6-32a08920e481} 59 | BlockChain 60 | 61 | 62 | 63 | -------------------------------------------------------------------------------- /csharp/BlockChain.Console/Program.cs: -------------------------------------------------------------------------------- 1 | namespace BlockChainDemo.Console 2 | { 3 | class Program 4 | { 5 | static void Main(string[] args) 6 | { 7 | var chain = new BlockChain(); 8 | var server = new WebServer(chain); 9 | System.Console.Read(); 10 | } 11 | } 12 | } 13 | -------------------------------------------------------------------------------- /csharp/BlockChain.Console/Properties/AssemblyInfo.cs: -------------------------------------------------------------------------------- 1 | using System.Reflection; 2 | using System.Runtime.CompilerServices; 3 | using System.Runtime.InteropServices; 4 | 5 | // General Information about an assembly is controlled through the following 6 | // set of attributes. Change these attribute values to modify the information 7 | // associated with an assembly. 8 | [assembly: AssemblyTitle("BlockChain.Console")] 9 | [assembly: AssemblyDescription("")] 10 | [assembly: AssemblyConfiguration("")] 11 | [assembly: AssemblyCompany("")] 12 | [assembly: AssemblyProduct("BlockChain.Console")] 13 | [assembly: AssemblyCopyright("Copyright © 2017")] 14 | [assembly: AssemblyTrademark("")] 15 | [assembly: AssemblyCulture("")] 16 | 17 | // Setting ComVisible to false makes the types in this assembly not visible 18 | // to COM components. If you need to access a type in this assembly from 19 | // COM, set the ComVisible attribute to true on that type. 20 | [assembly: ComVisible(false)] 21 | 22 | // The following GUID is for the ID of the typelib if this project is exposed to COM 23 | [assembly: Guid("d0c795a0-6f20-4a8e-be44-801678754da4")] 24 | 25 | // Version information for an assembly consists of the following four values: 26 | // 27 | // Major Version 28 | // Minor Version 29 | // Build Number 30 | // Revision 31 | // 32 | // You can specify all the values or you can default the Build and Revision Numbers 33 | // by using the '*' as shown below: 34 | // [assembly: AssemblyVersion("1.0.*")] 35 | [assembly: AssemblyVersion("1.0.0.0")] 36 | [assembly: AssemblyFileVersion("1.0.0.0")] 37 | -------------------------------------------------------------------------------- /csharp/BlockChain.sln: -------------------------------------------------------------------------------- 1 |  2 | Microsoft Visual Studio Solution File, Format Version 12.00 3 | # Visual Studio 15 4 | VisualStudioVersion = 15.0.27004.2008 5 | MinimumVisualStudioVersion = 10.0.40219.1 6 | Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BlockChain", "BlockChain\BlockChain.csproj", "{E06FC4CE-77D0-4A64-94A6-32A08920E481}" 7 | EndProject 8 | Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BlockChain.Console", "BlockChain.Console\BlockChain.Console.csproj", "{D0C795A0-6F20-4A8E-BE44-801678754DA4}" 9 | EndProject 10 | Global 11 | GlobalSection(SolutionConfigurationPlatforms) = preSolution 12 | Debug|Any CPU = Debug|Any CPU 13 | Release|Any CPU = Release|Any CPU 14 | EndGlobalSection 15 | GlobalSection(ProjectConfigurationPlatforms) = postSolution 16 | {E06FC4CE-77D0-4A64-94A6-32A08920E481}.Debug|Any CPU.ActiveCfg = Debug|Any CPU 17 | {E06FC4CE-77D0-4A64-94A6-32A08920E481}.Debug|Any CPU.Build.0 = Debug|Any CPU 18 | {E06FC4CE-77D0-4A64-94A6-32A08920E481}.Release|Any CPU.ActiveCfg = Release|Any CPU 19 | {E06FC4CE-77D0-4A64-94A6-32A08920E481}.Release|Any CPU.Build.0 = Release|Any CPU 20 | {D0C795A0-6F20-4A8E-BE44-801678754DA4}.Debug|Any CPU.ActiveCfg = Debug|Any CPU 21 | {D0C795A0-6F20-4A8E-BE44-801678754DA4}.Debug|Any CPU.Build.0 = Debug|Any CPU 22 | {D0C795A0-6F20-4A8E-BE44-801678754DA4}.Release|Any CPU.ActiveCfg = Release|Any CPU 23 | {D0C795A0-6F20-4A8E-BE44-801678754DA4}.Release|Any CPU.Build.0 = Release|Any CPU 24 | EndGlobalSection 25 | GlobalSection(SolutionProperties) = preSolution 26 | HideSolutionNode = FALSE 27 | EndGlobalSection 28 | GlobalSection(ExtensibilityGlobals) = postSolution 29 | SolutionGuid = {7FB3650B-CAFB-4A71-940B-0CA6F0377422} 30 | EndGlobalSection 31 | GlobalSection(TeamFoundationVersionControl) = preSolution 32 | SccNumberOfProjects = 3 33 | SccEnterpriseProvider = {4CA58AB2-18FA-4F8D-95D4-32DDF27D184C} 34 | SccTeamFoundationServer = https://devfire.visualstudio.com/ 35 | SccLocalPath0 = . 36 | SccProjectUniqueName1 = BlockChain\\BlockChain.csproj 37 | SccProjectName1 = BlockChain 38 | SccLocalPath1 = BlockChain 39 | SccProjectUniqueName2 = BlockChain.Console\\BlockChain.Console.csproj 40 | SccProjectName2 = BlockChain.Console 41 | SccLocalPath2 = BlockChain.Console 42 | EndGlobalSection 43 | EndGlobal 44 | -------------------------------------------------------------------------------- /csharp/BlockChain/Block.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.Collections.Generic; 3 | 4 | namespace BlockChainDemo 5 | { 6 | public class Block 7 | { 8 | public int Index { get; set; } 9 | public DateTime Timestamp { get; set; } 10 | public List Transactions { get; set; } 11 | public int Proof { get; set; } 12 | public string PreviousHash { get; set; } 13 | 14 | public override string ToString() 15 | { 16 | return $"{Index} [{Timestamp.ToString("yyyy-MM-dd HH:mm:ss")}] Proof: {Proof} | PrevHash: {PreviousHash} | Trx: {Transactions.Count}"; 17 | } 18 | } 19 | } -------------------------------------------------------------------------------- /csharp/BlockChain/BlockChain.cs: -------------------------------------------------------------------------------- 1 | using Newtonsoft.Json; 2 | using System; 3 | using System.Collections.Generic; 4 | using System.Diagnostics; 5 | using System.IO; 6 | using System.Linq; 7 | using System.Net; 8 | using System.Security.Cryptography; 9 | using System.Text; 10 | 11 | namespace BlockChainDemo 12 | { 13 | public class BlockChain 14 | { 15 | private List _currentTransactions = new List(); 16 | private List _chain = new List(); 17 | private List _nodes = new List(); 18 | private Block _lastBlock => _chain.Last(); 19 | 20 | public string NodeId { get; private set; } 21 | 22 | //ctor 23 | public BlockChain() 24 | { 25 | NodeId = Guid.NewGuid().ToString().Replace("-", ""); 26 | CreateNewBlock(proof: 100, previousHash: "1"); //genesis block 27 | } 28 | 29 | //private functionality 30 | private void RegisterNode(string address) 31 | { 32 | _nodes.Add(new Node { Address = new Uri(address) }); 33 | } 34 | 35 | private bool IsValidChain(List chain) 36 | { 37 | Block block = null; 38 | Block lastBlock = chain.First(); 39 | int currentIndex = 1; 40 | while (currentIndex < chain.Count) 41 | { 42 | block = chain.ElementAt(currentIndex); 43 | Debug.WriteLine($"{lastBlock}"); 44 | Debug.WriteLine($"{block}"); 45 | Debug.WriteLine("----------------------------"); 46 | 47 | //Check that the hash of the block is correct 48 | if (block.PreviousHash != GetHash(lastBlock)) 49 | return false; 50 | 51 | //Check that the Proof of Work is correct 52 | if (!IsValidProof(lastBlock.Proof, block.Proof, lastBlock.PreviousHash)) 53 | return false; 54 | 55 | lastBlock = block; 56 | currentIndex++; 57 | } 58 | 59 | return true; 60 | } 61 | 62 | private bool ResolveConflicts() 63 | { 64 | List newChain = null; 65 | int maxLength = _chain.Count; 66 | 67 | foreach (Node node in _nodes) 68 | { 69 | var url = new Uri(node.Address, "/chain"); 70 | var request = (HttpWebRequest)WebRequest.Create(url); 71 | var response = (HttpWebResponse)request.GetResponse(); 72 | 73 | if (response.StatusCode == HttpStatusCode.OK) 74 | { 75 | var model = new 76 | { 77 | chain = new List(), 78 | length = 0 79 | }; 80 | string json = new StreamReader(response.GetResponseStream()).ReadToEnd(); 81 | var data = JsonConvert.DeserializeAnonymousType(json, model); 82 | 83 | if (data.chain.Count > _chain.Count && IsValidChain(data.chain)) 84 | { 85 | maxLength = data.chain.Count; 86 | newChain = data.chain; 87 | } 88 | } 89 | } 90 | 91 | if (newChain != null) 92 | { 93 | _chain = newChain; 94 | return true; 95 | } 96 | 97 | return false; 98 | } 99 | 100 | private Block CreateNewBlock(int proof, string previousHash = null) 101 | { 102 | var block = new Block 103 | { 104 | Index = _chain.Count, 105 | Timestamp = DateTime.UtcNow, 106 | Transactions = _currentTransactions.ToList(), 107 | Proof = proof, 108 | PreviousHash = previousHash ?? GetHash(_chain.Last()) 109 | }; 110 | 111 | _currentTransactions.Clear(); 112 | _chain.Add(block); 113 | return block; 114 | } 115 | 116 | private int CreateProofOfWork(int lastProof, string previousHash) 117 | { 118 | int proof = 0; 119 | while (!IsValidProof(lastProof, proof, previousHash)) 120 | proof++; 121 | 122 | return proof; 123 | } 124 | 125 | private bool IsValidProof(int lastProof, int proof, string previousHash) 126 | { 127 | string guess = $"{lastProof}{proof}{previousHash}"; 128 | string result = GetSha256(guess); 129 | return result.StartsWith("0000"); 130 | } 131 | 132 | private string GetHash(Block block) 133 | { 134 | string blockText = JsonConvert.SerializeObject(block); 135 | return GetSha256(blockText); 136 | } 137 | 138 | private string GetSha256(string data) 139 | { 140 | var sha256 = new SHA256Managed(); 141 | var hashBuilder = new StringBuilder(); 142 | 143 | byte[] bytes = Encoding.Unicode.GetBytes(data); 144 | byte[] hash = sha256.ComputeHash(bytes); 145 | 146 | foreach (byte x in hash) 147 | hashBuilder.Append($"{x:x2}"); 148 | 149 | return hashBuilder.ToString(); 150 | } 151 | 152 | //web server calls 153 | internal string Mine() 154 | { 155 | int proof = CreateProofOfWork(_lastBlock.Proof, _lastBlock.PreviousHash); 156 | 157 | CreateTransaction(sender: "0", recipient: NodeId, amount: 1); 158 | Block block = CreateNewBlock(proof /*, _lastBlock.PreviousHash*/); 159 | 160 | var response = new 161 | { 162 | Message = "New Block Forged", 163 | Index = block.Index, 164 | Transactions = block.Transactions.ToArray(), 165 | Proof = block.Proof, 166 | PreviousHash = block.PreviousHash 167 | }; 168 | 169 | return JsonConvert.SerializeObject(response); 170 | } 171 | 172 | internal string GetFullChain() 173 | { 174 | var response = new 175 | { 176 | chain = _chain.ToArray(), 177 | length = _chain.Count 178 | }; 179 | 180 | return JsonConvert.SerializeObject(response); 181 | } 182 | 183 | internal string RegisterNodes(string[] nodes) 184 | { 185 | var builder = new StringBuilder(); 186 | foreach (string node in nodes) 187 | { 188 | string url = $"http://{node}"; 189 | RegisterNode(url); 190 | builder.Append($"{url}, "); 191 | } 192 | 193 | builder.Insert(0, $"{nodes.Count()} new nodes have been added: "); 194 | string result = builder.ToString(); 195 | return result.Substring(0, result.Length - 2); 196 | } 197 | 198 | internal string Consensus() 199 | { 200 | bool replaced = ResolveConflicts(); 201 | string message = replaced ? "was replaced" : "is authoritive"; 202 | 203 | var response = new 204 | { 205 | Message = $"Our chain {message}", 206 | Chain = _chain 207 | }; 208 | 209 | return JsonConvert.SerializeObject(response); 210 | } 211 | 212 | internal int CreateTransaction(string sender, string recipient, int amount) 213 | { 214 | var transaction = new Transaction 215 | { 216 | Sender = sender, 217 | Recipient = recipient, 218 | Amount = amount 219 | }; 220 | 221 | _currentTransactions.Add(transaction); 222 | 223 | return _lastBlock != null ? _lastBlock.Index + 1 : 0; 224 | } 225 | } 226 | } 227 | -------------------------------------------------------------------------------- /csharp/BlockChain/BlockChain.csproj: -------------------------------------------------------------------------------- 1 |  2 | 3 | 4 | 5 | Debug 6 | AnyCPU 7 | {E06FC4CE-77D0-4A64-94A6-32A08920E481} 8 | Library 9 | Properties 10 | BlockChainDemo 11 | BlockChainDemo 12 | v4.5.1 13 | 512 14 | SAK 15 | SAK 16 | SAK 17 | SAK 18 | 19 | 20 | 21 | true 22 | full 23 | false 24 | bin\Debug\ 25 | DEBUG;TRACE 26 | prompt 27 | 4 28 | 29 | 30 | pdbonly 31 | true 32 | bin\Release\ 33 | TRACE 34 | prompt 35 | 4 36 | 37 | 38 | 39 | ..\packages\Newtonsoft.Json.10.0.3\lib\net45\Newtonsoft.Json.dll 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | ..\packages\TinyWebServer.dll.1.0.1\lib\net40\TinyWebServer.dll 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 73 | -------------------------------------------------------------------------------- /csharp/BlockChain/Node.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace BlockChainDemo 4 | { 5 | public class Node 6 | { 7 | public Uri Address { get; set; } 8 | } 9 | } -------------------------------------------------------------------------------- /csharp/BlockChain/Properties/AssemblyInfo.cs: -------------------------------------------------------------------------------- 1 | using System.Reflection; 2 | using System.Runtime.CompilerServices; 3 | using System.Runtime.InteropServices; 4 | 5 | // General Information about an assembly is controlled through the following 6 | // set of attributes. Change these attribute values to modify the information 7 | // associated with an assembly. 8 | [assembly: AssemblyTitle("BlockChain")] 9 | [assembly: AssemblyDescription("")] 10 | [assembly: AssemblyConfiguration("")] 11 | [assembly: AssemblyCompany("")] 12 | [assembly: AssemblyProduct("BlockChain")] 13 | [assembly: AssemblyCopyright("Copyright © 2017")] 14 | [assembly: AssemblyTrademark("")] 15 | [assembly: AssemblyCulture("")] 16 | 17 | // Setting ComVisible to false makes the types in this assembly not visible 18 | // to COM components. If you need to access a type in this assembly from 19 | // COM, set the ComVisible attribute to true on that type. 20 | [assembly: ComVisible(false)] 21 | 22 | // The following GUID is for the ID of the typelib if this project is exposed to COM 23 | [assembly: Guid("e06fc4ce-77d0-4a64-94a6-32a08920e481")] 24 | 25 | // Version information for an assembly consists of the following four values: 26 | // 27 | // Major Version 28 | // Minor Version 29 | // Build Number 30 | // Revision 31 | // 32 | // You can specify all the values or you can default the Build and Revision Numbers 33 | // by using the '*' as shown below: 34 | // [assembly: AssemblyVersion("1.0.*")] 35 | [assembly: AssemblyVersion("1.0.0.0")] 36 | [assembly: AssemblyFileVersion("1.0.0.0")] 37 | -------------------------------------------------------------------------------- /csharp/BlockChain/Transaction.cs: -------------------------------------------------------------------------------- 1 | namespace BlockChainDemo 2 | { 3 | public class Transaction 4 | { 5 | public int Amount { get; set; } 6 | public string Recipient { get; set; } 7 | public string Sender { get; set; } 8 | } 9 | } -------------------------------------------------------------------------------- /csharp/BlockChain/WebServer.cs: -------------------------------------------------------------------------------- 1 | using Newtonsoft.Json; 2 | using System.Configuration; 3 | using System.IO; 4 | using System.Net; 5 | using System.Net.Http; 6 | 7 | namespace BlockChainDemo 8 | { 9 | public class WebServer 10 | { 11 | public WebServer(BlockChain chain) 12 | { 13 | var settings = ConfigurationManager.AppSettings; 14 | string host = settings["host"]?.Length > 1 ? settings["host"] : "localhost"; 15 | string port = settings["port"]?.Length > 1 ? settings["port"] : "12345"; 16 | 17 | var server = new TinyWebServer.WebServer(request => 18 | { 19 | string path = request.Url.PathAndQuery.ToLower(); 20 | string query = ""; 21 | string json = ""; 22 | if (path.Contains("?")) 23 | { 24 | string[] parts = path.Split('?'); 25 | path = parts[0]; 26 | query = parts[1]; 27 | } 28 | 29 | switch (path) 30 | { 31 | //GET: http://localhost:12345/mine 32 | case "/mine": 33 | return chain.Mine(); 34 | 35 | //POST: http://localhost:12345/transactions/new 36 | //{ "Amount":123, "Recipient":"ebeabf5cc1d54abdbca5a8fe9493b479", "Sender":"31de2e0ef1cb4937830fcfd5d2b3b24f" } 37 | case "/transactions/new": 38 | if (request.HttpMethod != HttpMethod.Post.Method) 39 | return $"{new HttpResponseMessage(HttpStatusCode.MethodNotAllowed)}"; 40 | 41 | json = new StreamReader(request.InputStream).ReadToEnd(); 42 | Transaction trx = JsonConvert.DeserializeObject(json); 43 | int blockId = chain.CreateTransaction(trx.Sender, trx.Recipient, trx.Amount); 44 | return $"Your transaction will be included in block {blockId}"; 45 | 46 | //GET: http://localhost:12345/chain 47 | case "/chain": 48 | return chain.GetFullChain(); 49 | 50 | //POST: http://localhost:12345/nodes/register 51 | //{ "Urls": ["localhost:54321", "localhost:54345", "localhost:12321"] } 52 | case "/nodes/register": 53 | if (request.HttpMethod != HttpMethod.Post.Method) 54 | return $"{new HttpResponseMessage(HttpStatusCode.MethodNotAllowed)}"; 55 | 56 | json = new StreamReader(request.InputStream).ReadToEnd(); 57 | var urlList = new { Urls = new string[0] }; 58 | var obj = JsonConvert.DeserializeAnonymousType(json, urlList); 59 | return chain.RegisterNodes(obj.Urls); 60 | 61 | //GET: http://localhost:12345/nodes/resolve 62 | case "/nodes/resolve": 63 | return chain.Consensus(); 64 | } 65 | 66 | return ""; 67 | }, 68 | $"http://{host}:{port}/mine/", 69 | $"http://{host}:{port}/transactions/new/", 70 | $"http://{host}:{port}/chain/", 71 | $"http://{host}:{port}/nodes/register/", 72 | $"http://{host}:{port}/nodes/resolve/" 73 | ); 74 | 75 | server.Run(); 76 | } 77 | } 78 | } 79 | -------------------------------------------------------------------------------- /csharp/BlockChain/packages.config: -------------------------------------------------------------------------------- 1 |  2 | 3 | 4 | 5 | -------------------------------------------------------------------------------- /js/blockchain.js: -------------------------------------------------------------------------------- 1 | const crypto = require("crypto"); 2 | 3 | 4 | class Blockchain { 5 | constructor() { 6 | this.chain = []; 7 | this.pendingTransactions = []; 8 | this.newBlock(); 9 | this.peers = new Set(); 10 | } 11 | 12 | /** 13 | * Adds a node to our peer table 14 | */ 15 | addPeer(host) { 16 | this.peers.add(host); 17 | } 18 | 19 | /** 20 | * Adds a node to our peer table 21 | */ 22 | getPeers() { 23 | return Array.from(this.peers); 24 | } 25 | 26 | /** 27 | * Creates a new block containing any outstanding transactions 28 | */ 29 | newBlock(previousHash, nonce = null) { 30 | let block = { 31 | index: this.chain.length, 32 | timestamp: new Date().toISOString(), 33 | transactions: this.pendingTransactions, 34 | previousHash, 35 | nonce 36 | }; 37 | 38 | block.hash = Blockchain.hash(block); 39 | 40 | console.log(`Created block ${block.index}`); 41 | 42 | // Add the new block to the blockchain 43 | this.chain.push(block); 44 | 45 | // Reset pending transactions 46 | this.pendingTransactions = []; 47 | } 48 | 49 | /** 50 | * Generates a SHA-256 hash of the block 51 | */ 52 | static hash(block) { 53 | const blockString = JSON.stringify(block, Object.keys(block).sort()); 54 | return crypto.createHash("sha256").update(blockString).digest("hex"); 55 | } 56 | 57 | /** 58 | * Returns the last block in the chain 59 | */ 60 | lastBlock() { 61 | return this.chain.length && this.chain[this.chain.length - 1]; 62 | } 63 | 64 | /** 65 | * Determines if a hash begins with a "difficulty" number of 0s 66 | * 67 | * @param hashOfBlock: the hash of the block (hex string) 68 | * @param difficulty: an integer defining the difficulty 69 | */ 70 | static powIsAcceptable(hashOfBlock, difficulty) { 71 | return hashOfBlock.slice(0, difficulty) === "0".repeat(difficulty); 72 | } 73 | 74 | /** 75 | * Generates a random 32 byte string 76 | */ 77 | static nonce() { 78 | return crypto.createHash("sha256").update(crypto.randomBytes(32)).digest("hex"); 79 | } 80 | 81 | /** 82 | * Proof of Work mining algorithm 83 | * 84 | * We hash the block with random string until the hash begins with 85 | * a "difficulty" number of 0s. 86 | */ 87 | mine(blockToMine = null, difficulty = 4) { 88 | const block = blockToMine || this.lastBlock(); 89 | 90 | while (true) { 91 | block.nonce = Blockchain.nonce(); 92 | if (Blockchain.powIsAcceptable(Blockchain.hash(block), difficulty)) { 93 | console.log("We mined a block!") 94 | console.log(` - Block hash: ${Blockchain.hash(block)}`); 95 | console.log(` - nonce: ${block.nonce}`); 96 | return block; 97 | } 98 | } 99 | } 100 | } 101 | 102 | module.exports = Blockchain; 103 | -------------------------------------------------------------------------------- /js/index.js: -------------------------------------------------------------------------------- 1 | const Blockchain = require("./blockchain"); 2 | const {send} = require("micro"); 3 | 4 | const blockchain = new Blockchain(); 5 | 6 | 7 | module.exports = async (request, response) => { 8 | const route = request.url; 9 | 10 | // Keep track of the peers that have contacted us 11 | blockchain.addPeer(request.headers.host); 12 | 13 | let output; 14 | 15 | switch (route) { 16 | case "/new_block": 17 | output = blockchain.newBlock(); 18 | break; 19 | 20 | case "/last_block": 21 | output = blockchain.lastBlock(); 22 | break; 23 | 24 | case "/get_peers": 25 | output = blockchain.getPeers(); 26 | break; 27 | 28 | case "/submit_transaction": 29 | output = blockchain.addTransaction(transaction); 30 | break; 31 | 32 | default: 33 | output = blockchain.lastBlock(); 34 | 35 | } 36 | send(response, 200, output); 37 | }; 38 | -------------------------------------------------------------------------------- /js/package-lock.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "blockchain", 3 | "version": "1.0.0", 4 | "lockfileVersion": 1, 5 | "requires": true, 6 | "dependencies": { 7 | "abbrev": { 8 | "version": "1.1.1", 9 | "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz", 10 | "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==" 11 | }, 12 | "ansi-align": { 13 | "version": "2.0.0", 14 | "resolved": "https://registry.npmjs.org/ansi-align/-/ansi-align-2.0.0.tgz", 15 | "integrity": "sha1-w2rsy6VjuJzrVW82kPCx2eNUf38=", 16 | "requires": { 17 | "string-width": "^2.0.0" 18 | } 19 | }, 20 | "ansi-regex": { 21 | "version": "3.0.0", 22 | "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz", 23 | "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=" 24 | }, 25 | 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} 2818 | }, 2819 | "yargs-parser": { 2820 | "version": "9.0.2", 2821 | "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-9.0.2.tgz", 2822 | "integrity": "sha1-nM9qQ0YP5O1Aqbto9I1DuKaMwHc=", 2823 | "requires": { 2824 | "camelcase": "^4.1.0" 2825 | } 2826 | } 2827 | } 2828 | } 2829 | -------------------------------------------------------------------------------- /js/package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "blockchain", 3 | "version": "1.0.0", 4 | "description": "", 5 | "main": "index.js", 6 | "scripts": { 7 | "dev": "nodemon blockchain.js", 8 | "server": "micro-dev" 9 | }, 10 | "author": "", 11 | "license": "ISC", 12 | "dependencies": { 13 | "micro": "^9.3.4", 14 | "micro-dev": "^3.0.0", 15 | "nodemon": "^1.19.0" 16 | } 17 | } 18 | -------------------------------------------------------------------------------- /requirements.txt: -------------------------------------------------------------------------------- 1 | flask==0.12.2 2 | requests==2.18.4 3 | -------------------------------------------------------------------------------- /tests/__init__.py: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Pro-WebTech/dvf-blockchain-v1/ee45436a3fe6bd62a6403a25f8b26ce69715692c/tests/__init__.py -------------------------------------------------------------------------------- /tests/test_blockchain.py: -------------------------------------------------------------------------------- 1 | import hashlib 2 | import json 3 | from unittest import TestCase 4 | 5 | from blockchain import Blockchain 6 | 7 | 8 | class BlockchainTestCase(TestCase): 9 | 10 | def setUp(self): 11 | self.blockchain = Blockchain() 12 | 13 | def create_block(self, proof=123, previous_hash='abc'): 14 | self.blockchain.new_block(proof, previous_hash) 15 | 16 | def create_transaction(self, sender='a', recipient='b', amount=1): 17 | self.blockchain.new_transaction( 18 | sender=sender, 19 | recipient=recipient, 20 | amount=amount 21 | ) 22 | 23 | 24 | class TestRegisterNodes(BlockchainTestCase): 25 | 26 | def test_valid_nodes(self): 27 | blockchain = Blockchain() 28 | 29 | blockchain.register_node('http://192.168.0.1:5000') 30 | 31 | self.assertIn('192.168.0.1:5000', blockchain.nodes) 32 | 33 | def test_malformed_nodes(self): 34 | blockchain = Blockchain() 35 | 36 | blockchain.register_node('http//192.168.0.1:5000') 37 | 38 | self.assertNotIn('192.168.0.1:5000', blockchain.nodes) 39 | 40 | def test_idempotency(self): 41 | blockchain = Blockchain() 42 | 43 | blockchain.register_node('http://192.168.0.1:5000') 44 | blockchain.register_node('http://192.168.0.1:5000') 45 | 46 | assert len(blockchain.nodes) == 1 47 | 48 | 49 | class TestBlocksAndTransactions(BlockchainTestCase): 50 | 51 | def test_block_creation(self): 52 | self.create_block() 53 | 54 | latest_block = self.blockchain.last_block 55 | 56 | # The genesis block is create at initialization, so the length should be 2 57 | assert len(self.blockchain.chain) == 2 58 | assert latest_block['index'] == 2 59 | assert latest_block['timestamp'] is not None 60 | assert latest_block['proof'] == 123 61 | assert latest_block['previous_hash'] == 'abc' 62 | 63 | def test_create_transaction(self): 64 | self.create_transaction() 65 | 66 | transaction = self.blockchain.current_transactions[-1] 67 | 68 | assert transaction 69 | assert transaction['sender'] == 'a' 70 | assert transaction['recipient'] == 'b' 71 | assert transaction['amount'] == 1 72 | 73 | def test_block_resets_transactions(self): 74 | self.create_transaction() 75 | 76 | initial_length = len(self.blockchain.current_transactions) 77 | 78 | self.create_block() 79 | 80 | current_length = len(self.blockchain.current_transactions) 81 | 82 | assert initial_length == 1 83 | assert current_length == 0 84 | 85 | def test_return_last_block(self): 86 | self.create_block() 87 | 88 | created_block = self.blockchain.last_block 89 | 90 | assert len(self.blockchain.chain) == 2 91 | assert created_block is self.blockchain.chain[-1] 92 | 93 | 94 | class TestHashingAndProofs(BlockchainTestCase): 95 | 96 | def test_hash_is_correct(self): 97 | self.create_block() 98 | 99 | new_block = self.blockchain.last_block 100 | new_block_json = json.dumps(self.blockchain.last_block, sort_keys=True).encode() 101 | new_hash = hashlib.sha256(new_block_json).hexdigest() 102 | 103 | assert len(new_hash) == 64 104 | assert new_hash == self.blockchain.hash(new_block) 105 | --------------------------------------------------------------------------------