Baidu Ban Makes Bitcoin’s Fate Unknown in Its Largest Market

The ban of all bitcoin and virtual currency-related advertising from the online portals of China’s largest search engine, Baidu, has thrown the fate of cryptocurrencies into a dicey state in the world’s largest market for bitcoin trading and mining. As China literally controls the bitcoin market, this move is likely to have a multiplier effect on the entire ecosystem. Though the reported […]

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Making peer connection in Python

I’m trying to make a simple peer connection using Python.

If I understand correctly communication begins by sending a “version” packet to the receiving node. The node then sends back a “verack” packet, afterwards you may begin querying for data/pushing txs.

Ken Shirriff’s blog has proved invaluable in getting me this far but I’m unable to get his code examples working, possibly because they’re dated?

In particular, when running:

https://github.com/shirriff/bitcoin-code/blob/master/minimalPeerConnection.py

the socket closes immediately. I fail to receive back a “verack” and am unable to proceed with pushing my tx. Note that I’ve replaced his hard-coded IP with a currently operating node (124.248.237.178:8333).

I’ve attempted to construct a more “up to date” version packet (70002) referencing these docs but run into the same issue:

import struct import socket import time import hashlib import binascii  magic = 0xd9b4bef9  def makeMessage(magic,command,payload):     checksum = hashlib.sha256(hashlib.sha256(payload).digest()).digest()[0:4]     return struct.pack('L12sL4s',magic,command,len(payload),checksum).encode("hex")+payload def makeVersionPayload():     version = 70002     services = 1     timestamp = int(time.time())      adr_u = "::ffff:127.0.0.1"     services_u = 1     port_u = 8333      adr_me = "::ffff:127.0.0.1"     services_me = 1     port_me = 8333      nonce = 0      user_agent_bytes = 0     start_height = 0     relay = 0      #https://bitcoin.org/en/developer-reference#version     payload_hex = "";     payload_hex += struct.pack("<L",version).encode("hex")     payload_hex += struct.pack("<Q",services).encode("hex")     payload_hex += struct.pack("<Q",timestamp).encode("hex")     payload_hex += struct.pack("<Q",services_u).encode("hex")     payload_hex += struct.pack(">16s",adr_u).encode("hex")     payload_hex += struct.pack(">H",port_u).encode("hex")     payload_hex += struct.pack("<Q",services_me).encode("hex")     payload_hex += struct.pack(">16s",adr_me).encode("hex")     payload_hex += struct.pack(">H",port_me).encode("hex")     payload_hex += struct.pack("<Q",nonce).encode("hex")     payload_hex += struct.pack("<B",user_agent_bytes).encode("hex")     payload_hex += struct.pack("<L",start_height).encode("hex")     payload_hex += struct.pack("<B",relay).encode("hex")     return payload_hex  ip = socket.gethostbyname("124.248.237.178") port = 8333 sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) print "connected to node..." sock.connect((ip,port))  hex_msg = makeMessage(magic,"version",makeVersionPayload()) print "sending version packet" sock.send(binascii.unhexlify(hex_msg))  while 1:     msg = sock.recv(4096)     if not msg:         print "disconnected"         exit()     else:         #expecting verack?         print "response: ",msg 

Can anyone point me in the right direction?

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