Just a really simple, insecure and incomplete implementation of a blockchain for a cryptocurrency made in Python as educational material. In other words, a simple Bitcoin clone.
Home Page: http://copitosystem.com
License: MIT License
Add unittests
It would be really cool if the nodes, automatically detect other nodes, an with that, I mean dynamically, and of course they should validate the blockchains. In the miner.py script, there is an function, which should do this, but it just returns true to every blockchain it becomes. Please do this, because that a really important thing !
So i want to host the simplecoin on a server to make transaction with another people, we can do that ?
Apart from having a few hard coded nodes, there should be a simple system that add new trusted peer nodes.
I got http code 500 when I run miner.py :
* Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
[2018-02-24 17:17:18,787] ERROR in app: Exception on /txion [GET]
Traceback (most recent call last):
File "/home/jason/anaconda3/lib/python3.6/site-packages/flask/app.py", line 1982, in wsgi_app
response = self.full_dispatch_request()
File "/home/jason/anaconda3/lib/python3.6/site-packages/flask/app.py", line 1615, in full_dispatch_request
return self.finalize_request(rv)
File "/home/jason/anaconda3/lib/python3.6/site-packages/flask/app.py", line 1630, in finalize_request
response = self.make_response(rv)
File "/home/jason/anaconda3/lib/python3.6/site-packages/flask/app.py", line 1725, in make_response
raise ValueError('View function did not return a response')
ValueError: View function did not return a response
127.0.0.1 - - [24/Feb/2018 17:17:18] "GET /txion?update=dgBVRxwlanhdodHYanSctJDj72G3f1Uen+4tpkjSfQdSSJwKLHjyu90VeEPrh7S9aMgScguyJlDwyJCv1RBo7g== HTTP/1.1" 500 -
I'm trying to run this on a local machine.
I've setup two copies of the miner and miner_config scripts with the correct information so they reference eachother and do not clash.
But there is an issue, one miner starts then it fails because the other miner is unreachable.
And when I try to bind to an external ip it immediately dies.
Is there any logging of miner activity?
Hey When Im trying To Launch Wallet.py I Get This Error ModuleNotFoundError: No module named 'requests' And I Get This Error Also ModuleNotFoundError: No module named 'ecdsa' Can Someone Help Me Or Fix This Bug
when i was learning your code, a question is raised that:
when you deliver the chain from "miner" to "flask server", you use pipe.
but when you deliver the transaction pool from "flask server" to "miner", you use http get.
is there a special reason or consideration for this inconsistency? or it is because only one pipe can be send to flask? (im not sure about it); also i believe pipe is duplex.
besides, this args seems totally useless, because what your get_blocks() api used is the global variable b, the input args is no way to be referred.
I'm trying to making my own cryptocurrency with learning this project.
I have a question : how many simplecoin we have and how can I change to for example 120,000,000,000
New transactions should be verified before being accepted. This will prevent several problems:
I think base64 is not good for cryptonycy. Base58 is good for this project
a user can give any number of "coins" because a balance is never checked. This is a core feature of any currency. Due to the fact that this is education, it is pivotal.
I think it would be better to download required modules and save them in the proyect.
This way the user wouldn't have to install all the modules required, more simple.
Hello,
Would you like me to work on some Flask functionality that would add
some info to the loopback 127.0.0.1 address?
Thanks,
Dan
Please share the flowchart of the given code so I can modify the same.
Thank you.
Kartikey Kushwah
As blockchain gets bigger, it will be necessary to be moved out of memory. Since this is a simplified version of a blockchain, saving it in a text file may be enough.
networking does not function.
i have this error when i run miner.py:
rocess Process-1:
Traceback (most recent call last):
File "/usr/lib/python3.6/multiprocessing/process.py", line 258, in _bootstrap
self.run()
File "/usr/lib/python3.6/multiprocessing/process.py", line 93, in run
self._target(*self._args, **self._kwargs)
File "miner.py", line 97, in mine
last_block = BLOCKCHAIN[len(BLOCKCHAIN) - 1]
TypeError: object of type 'bool' has no len()
Upon receiving blocks it should be validated. This should mirror what is necessary for proof of work.
The current proof of work algorithm is really simple to solve. This make it easy for an attacker to destroy the actual blockchain.
is it possible to use the wallet.py without starting the miner.py if the miner.py is already running on another computer?
hey, in line 71 it says we wait until the number is divisible by 9 to break the loop, but the mod is 7919. Not a big deal, but made me do a double take. Thanks for making this repo, btw :)
For those that don't want to mine, a new script should be created. It should also include an address generator.
thanks for your code, that is very brief and i can grasp the concept in 5 mins!
Hey guys I am new to using python and I keep getting this error. I am not sure what module is being referred too? Any help would be great. Thanks!
The readme suggests running the following command to install the project dependencies
pip install requirements.txt
But doing that only returns the following error:
$ pip install requirements.txt
Collecting requirements.txt
Could not find a version that satisfies the requirement requirements.txt (from versions: )
No matching distribution found for requirements.txt
A solution I found for this was changing the command to the following
pip install `cat requirements.txt`
And then it worked fine, perhaps the readme should be updated?
Hey, i tried executing wallet.py, basically i can not choose any available options, if i press 1 then enter, nothing happens :( does it only run on windows?
I wanted to see my own transitions but when I try it will give me :
C:\Users\mehan\Desktop\SimpleCoin\simpleCoin>python wallet.py
=========================================
SIMPLE COIN v1.0.0 - BLOCKCHAIN SYSTEM
=========================================
You can find more help at: https://github.com/cosme12/SimpleCoin
Make sure you are using the latest version or you may end in
a parallel chain.
What do you want to do?
1. Generate new wallet
2. Send coins to another wallet
3. Check transactions
3
Traceback (most recent call last):
File "C:\Users\mehan\AppData\Local\Programs\Python\Python39\lib\site-packages\urllib3\connection.py", line 169, in _new_conn
conn = connection.create_connection(
File "C:\Users\mehan\AppData\Local\Programs\Python\Python39\lib\site-packages\urllib3\util\connection.py", line 96, in create_connection
raise err
File "C:\Users\mehan\AppData\Local\Programs\Python\Python39\lib\site-packages\urllib3\util\connection.py", line 86, in create_connection
sock.connect(sa)
ConnectionRefusedError: [WinError 10061] No connection could be made because the target machine actively refused it
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\mehan\AppData\Local\Programs\Python\Python39\lib\site-packages\urllib3\connectionpool.py", line 699, in urlopen
httplib_response = self._make_request(
File "C:\Users\mehan\AppData\Local\Programs\Python\Python39\lib\site-packages\urllib3\connectionpool.py", line 394, in _make_request
conn.request(method, url, **httplib_request_kw)
File "C:\Users\mehan\AppData\Local\Programs\Python\Python39\lib\site-packages\urllib3\connection.py", line 234, in request
super(HTTPConnection, self).request(method, url, body=body, headers=headers)
File "C:\Users\mehan\AppData\Local\Programs\Python\Python39\lib\http\client.py", line 1253, in request
self._send_request(method, url, body, headers, encode_chunked)
File "C:\Users\mehan\AppData\Local\Programs\Python\Python39\lib\http\client.py", line 1299, in _send_request
self.endheaders(body, encode_chunked=encode_chunked)
File "C:\Users\mehan\AppData\Local\Programs\Python\Python39\lib\http\client.py", line 1248, in endheaders
self._send_output(message_body, encode_chunked=encode_chunked)
File "C:\Users\mehan\AppData\Local\Programs\Python\Python39\lib\http\client.py", line 1008, in _send_output
self.send(msg)
File "C:\Users\mehan\AppData\Local\Programs\Python\Python39\lib\http\client.py", line 948, in send
self.connect()
File "C:\Users\mehan\AppData\Local\Programs\Python\Python39\lib\site-packages\urllib3\connection.py", line 200, in connect
conn = self._new_conn()
File "C:\Users\mehan\AppData\Local\Programs\Python\Python39\lib\site-packages\urllib3\connection.py", line 181, in _new_conn
raise NewConnectionError(
urllib3.exceptions.NewConnectionError: <urllib3.connection.HTTPConnection object at 0x000001748EAAB610>: Failed to establish a new connection: [WinError 10061] No connection could be made because the target machine actively refused it
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\mehan\AppData\Local\Programs\Python\Python39\lib\site-packages\requests\adapters.py", line 439, in send
resp = conn.urlopen(
File "C:\Users\mehan\AppData\Local\Programs\Python\Python39\lib\site-packages\urllib3\connectionpool.py", line 755, in urlopen
retries = retries.increment(
File "C:\Users\mehan\AppData\Local\Programs\Python\Python39\lib\site-packages\urllib3\util\retry.py", line 574, in increment
raise MaxRetryError(_pool, url, error or ResponseError(cause))
urllib3.exceptions.MaxRetryError: HTTPConnectionPool(host='localhost', port=5000): Max retries exceeded with url: /blocks (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x000001748EAAB610>: Failed to establish a new connection: [WinError 10061] No connection could be made because the target machine actively refused it'))
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\mehan\Desktop\SimpleCoin\simpleCoin\wallet.py", line 135, in <module>
wallet()
File "C:\Users\mehan\Desktop\SimpleCoin\simpleCoin\wallet.py", line 52, in wallet
check_transactions()
File "C:\Users\mehan\Desktop\SimpleCoin\simpleCoin\wallet.py", line 88, in check_transactions
res = requests.get('http://localhost:5000/blocks')
File "C:\Users\mehan\AppData\Local\Programs\Python\Python39\lib\site-packages\requests\api.py", line 76, in get
return request('get', url, params=params, **kwargs)
File "C:\Users\mehan\AppData\Local\Programs\Python\Python39\lib\site-packages\requests\api.py", line 61, in request
return session.request(method=method, url=url, **kwargs)
File "C:\Users\mehan\AppData\Local\Programs\Python\Python39\lib\site-packages\requests\sessions.py", line 542, in request
resp = self.send(prep, **send_kwargs)
File "C:\Users\mehan\AppData\Local\Programs\Python\Python39\lib\site-packages\requests\sessions.py", line 655, in send
r = adapter.send(request, **kwargs)
File "C:\Users\mehan\AppData\Local\Programs\Python\Python39\lib\site-packages\requests\adapters.py", line 516, in send
raise ConnectionError(e, request=request)
requests.exceptions.ConnectionError: HTTPConnectionPool(host='localhost', port=5000): Max retries exceeded with url: /blocks (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x000001748EAAB610>: Failed to establish a new connection: [WinError 10061] No connection could be made because the target machine actively refused it'))
what I have to do ?
Output error when execute python3 miner.py on terminal:
Traceback (most recent call last):
File "/home/mateusfg7/Desktop/SimpleCoin/simpleCoin/miner.py", line 267, in <module>
p2 = Process(target=node.run(), args=b)
File "/usr/lib/python3/dist-packages/flask/app.py", line 990, in run
run_simple(host, port, self, **options)
File "/usr/lib/python3/dist-packages/werkzeug/serving.py", line 1052, in run_simple
inner()
File "/usr/lib/python3/dist-packages/werkzeug/serving.py", line 1005, in inner
fd=fd,
File "/usr/lib/python3/dist-packages/werkzeug/serving.py", line 848, in make_server
host, port, app, request_handler, passthrough_errors, ssl_context, fd=fd
File "/usr/lib/python3/dist-packages/werkzeug/serving.py", line 740, in __init__
HTTPServer.__init__(self, server_address, handler)
File "/usr/lib/python3.7/socketserver.py", line 452, in __init__
self.server_bind()
File "/usr/lib/python3.7/http/server.py", line 137, in server_bind
socketserver.TCPServer.server_bind(self)
File "/usr/lib/python3.7/socketserver.py", line 466, in server_bind
self.socket.bind(self.server_address)
OSError: [Errno 98] Address already in use
Process Process-1:
Traceback (most recent call last):
File "/usr/lib/python3.7/multiprocessing/process.py", line 297, in _bootstrap
self.run()
File "/usr/lib/python3.7/multiprocessing/process.py", line 99, in run
self._target(*self._args, **self._kwargs)
File "/home/mateusfg7/Desktop/SimpleCoin/simpleCoin/miner.py", line 112, in mine
NODE_PENDING_TRANSACTIONS = json.loads(NODE_PENDING_TRANSACTIONS)
File "/usr/lib/python3.7/json/__init__.py", line 348, in loads
return _default_decoder.decode(s)
File "/usr/lib/python3.7/json/decoder.py", line 340, in decode
raise JSONDecodeError("Extra data", s, end)
json.decoder.JSONDecodeError: Extra data: line 1 column 5 (char 4)
Blockchain doesn't save when miner mines blocks. This is a key feature that I think this project deserves.
Help me! I run in cmd.
The proof of work function will keep running until it finds a solution. It should stop working if any other peer node got it first.
Loaded node_peers blockchains should be validated. find_new_chains() should verify the new imported blockchain follows the requirements. This prevent attacks that attempt to completely change the blockchain history.
how to find out what is the total balance on the address?
give me a branch. i will create a simple cli wallet for simple soin.
* Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
127.0.0.1 - - [07/Feb/2018 20:42:11] "GET /txion?update=q3nf394hjg-random-miner-address-34nf3i4nflkn3oi HTTP/1.1" 200 -
Process Process-1:
Traceback (most recent call last):
File "C:\Users\spork\AppData\Local\Programs\Python\Python35\lib\multiprocessing\process.py", line 252, in _bootstrap
self.run()
File "C:\Users\spork\AppData\Local\Programs\Python\Python35\lib\multiprocessing\process.py", line 93, in run
self._target(*self._args, **self._kwargs)
File "C:\Users\spork\Desktop\SimpleCoin\simpleCoin\miner.py", line 114, in mine
NODE_PENDING_TRANSACTIONS = json.loads(NODE_PENDING_TRANSACTIONS)
File "C:\Users\spork\AppData\Local\Programs\Python\Python35\lib\json\__init__.py", line 312, in loads
s.__class__.__name__))
TypeError: the JSON object must be str, not 'bytes'
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