Related to the Bitcoin network and communication between different nodes on the Internet.

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Help with understanding Semaphore grants in OpenNetworkConnection

I am new to concurrent programming. Can any expert throw some light on the semaphore grant that one requires before acquiring a network connection ? bool OpenNetworkConnection(const CAddress& ...
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2answers
36 views

Is Bitcoin a decentralized time-stamping authority?

Can Bitcoin/blockchain be thought of as a decentralized time-stamping authority (TSA)? Is there true consensus in the Bitcoin network on a mined block's time, or just that the block was mined?
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32 views

Quantity of traffic on test network

I want to begin experimenting with bitcoin. I notice the estimated upload traffic for the real bitcoin network is around 200 GB per month. That's too much for an experiment. How much traffic per month ...
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1answer
20 views

What do Bitcoin Core options “maxreceivebuffer” and “maxsendbuffer” do?

What do Bitcoin Core options "maxreceivebuffer" and "maxsendbuffer" do? Is this a way of controlling the bandwidth Bitcoin Core uses?
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27 views

No connection to Bitcoin network from known Tor IP?

I have a very fast home Internet connection. I decided to share my bandwidth by setting up a Tor relay on an unused machine on my home network. Any connection I make from my home connection to an ...
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0answers
76 views

Are there drawbacks to the Thin Block patch?

Mike Hearn talked about a patch he applied to BitcoinXT recently in his AMA: I posted a patch last week that makes XT download blocks as lists of hashes instead of duplicating the transaction ...
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32 views

Unable to limit tcp bandwidth using tc in QoS for localhost

I am trying to connect few bitcoind instance running on different ports on my local machine and control the bandwidth between those connections. I used the tc utility as following: #network interface ...
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3answers
110 views

Starting point for listening to bitcoin network transactions in Python

I would like to create a python script that listens to the bitcoin network and monitors some addresses, stored in a mysql db. As soon as a transaction is broadcast with one of these addresses as an ...
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65 views

Setup a private bitcoin network

This question is similar to previosuly asked question Start a Private Bitcoin Network but since I can't comment there I am asking again. I am working on a concept specifically for existing bitcoin so ...
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2answers
196 views

What is my incentive for sending old blocks?

If I am a miner, it makes sense for me to broadcast recent blocks since I want my chain to be the longest (see What encourages Bitcoin miners to relay blocks?). However, what is my incentive for ...
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5answers
855 views

How to store data on the blockchain?

I am wondering if it is possible to give someone a bitcoin transaction ID and with that he can read some hidden data, like the blockchain.info notes on transactions, but for real, stored in the ...
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2answers
84 views

Bitcoin Core Network Configuration

I am having difficulty loading the full node for my new Bitcoin Core wallet. I use a Mac and share a modem with my apartment complex. I believe a manual network configuration is out of the cards for ...
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1answer
38 views

Why aren't block solutions sent to a multicast address?

In computer networking, multicast (one-to-many or many-to-many distribution) is group communication where information is addressed to a group of destination computers simultaneously. I think the ...
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1answer
131 views

Is there a way to find how many nodes are there?

As a single bitcoind node I can only detect how many connected peers I have. Is there a way to have a vision of the whole bitcoin network?
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73 views

Is 250mb/month enough bandwidth to support the internet needs of 4 mining rigs?

So this question was posed in 2011; I figure by now there may be slightly different factors at work, but mainly I ask if i can use a prepaid hotspot plan for 250mb to connect 4 sp20 mining rigs each ...
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1answer
57 views

How can one figure out what version of Bitcoin-Core is used most?

Where can one find statistics on how many nodes are running older Bitcoin Core versions or alternative clients?
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1answer
24 views

Metrics Correlated to “Health” of Bitcoin Node and Network

What metrics can I use as indicators of the health of (a) a full bitcoin node I am running and (b) the bitcoin network as a whole. Some examples I've considered: recency of last block I received on ...
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1answer
146 views

Total amount of nodes and avarage active peer number

I have 2 questions: Does anyone know where to find a reliable source for finding out a total amount of active bitcoin nodes? How many peers does each active node have in avarage? Is there a limit to ...
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1answer
53 views

What's happening in regtest mode? - Wireshark analysis

Motivated to watch data exchange on Bitcoin Newtwork, especially on regtest, and with hints from David Harding I decided to analyse traffic on regtest with Wireshark. I've installed and setup (I've ...
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2answers
50 views

Two if's before sending an inventory message

Going through main.cpp I couldn't completely understand the purpose of a double barrier coded as if-statements: I'm referring to ... if (pto->setInventoryKnown.count(inv)) and if ...
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1answer
48 views

What is “trickling” in terms of bitcoin?

In the Bitcoin (0.10.0) source code I'm coming across the term "trickle". Could someone please give short but accurate explanations on following instances and tell what they're used for? bool ...
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1answer
87 views

How many bitcoins would it require for a sustained DOS attack on bitcoin network?

How many bitcoins would it require for a sustained DOS attack on bitcoin network? Without transaction fee, how many bitcoins would that be? How many transactions could we generate with 1 BTC ...
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0answers
80 views

What requirements does a router need to fulfill to support a network of 50 miners?

I am running a network with fifty miners, and I am experiencing network problems with my current router from ASUS, because its memory fills up and it requires to restart in order to work properly. I ...
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0answers
27 views

Do any router custom firmwares enable Bitcoin for anonymous usage?

I want to find Wifi firmware where I can sell my internet service with anyone who needs to use it... ideally paying in an Altcoin or Bitcoin. Are there any router modifications that support a wallet ...
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1answer
263 views

Start a Private Bitcoin Network

Is there anyway to create my own Bitcoin Network? I'd love to put my first block into self-own Bitcoin Network and make it grow : ) Any ideas?
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1answer
100 views

How does bitcoin prevent this network splitting attack?

How are malicious nodes prevented from, after getting the nonce of a new block found by someone else, broadcast it to the other nodes claiming it to be its? Also, how does the bitcoin system solve ...
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1answer
85 views

Pseudo-Node and putative attack vectors on the network

Pseudo-Node is discussed here on Reddit's /r/Bitcoin Essentially it functions to relay calls from connected nodes in a random fashion. This was an experiment into how easily can full nodes be ...
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3answers
781 views

How do I compose a transaction with OP_RETURN in Python?

Currently trying to figure out how to use Python to construct a transaction with OP_RETURN. I tried to encode the message myself, and had no luck. I found a function, OPReturn(), on the internet, but ...
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1answer
132 views

Where are the Main network magic bytes stored in bitcoin's source code?

Bitcoin uses F9 BE B4 D9 as its main network magic bytes. I've searched the source but cannot find where these values are stored. Presumably they're computed, but I'm not sure where. Can someone tell ...
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2answers
191 views

Can an attacker create many nodes that approve blocks without work?

There are currently about 7000 nodes in the Bitcoin network. The security rests on the fact that someone adding nodes would have have to expend CPU power to hash transactions. What prevents someone ...
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1answer
107 views

How to determine custom synchronization status?

Context: I'm working on an application in which we'd like to know if the current node is sufficiently synced to be able to handle RPC requests. The method we would like to use is to see if our node ...
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2answers
68 views

Is Bitcoin a mesh network?

Considering following definition, can we say that bitcoin is a mesh network? A mesh network uses a network topology in which each node (called a mesh node) relays data for the network. All ...
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1answer
46 views

Does each peer prioritize inv(type=block) over inv(type=tx)?

I found that when a peer receives an inv message with type=block, it will immediately request that block or that block's headers with a getdata message or getheaders message. But if the peer receives ...
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1answer
55 views

Why am I not getting payments on my bitcoind on an amazon ec2 instance?

I have an amazon ec2 instance running a web server, MySQL server, and bitcoin daemon on ubuntu 14.04, and I ran ./bitcoind getnewaddress and the output was an address. I sent a few cents worth of ...
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2answers
190 views

How can I reduce the time until I get the newest block ? Does the number of the outbound peers affect the speed?

I am running a full node on the Bitcoin network. Sometimes, I find that it takes a while until I get the newest block. I checked the source code, and found that every node can at most connect to eight ...
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72 views

Server cannot connect to Peers With Some Internet Connections

I use the internet at my work, at my house, and at various other places. The server can connect with other peers and get block data at all of these locations except for my home. What could be the ...
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3answers
2k views

How do I use mSIGNA without the standard Bitcoin client?

Which IP do I have to fill in in mSIGNA to connect to the Bitcoin Network without using the BitcoinQt/bitcoind application? Is it possible to use mSIGNA and BitcoinQt even if the syncing process is ...
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1answer
107 views

If all block chain copies get deleted, what would happen?

What would happen if all block chain copies get deleted at one time? At first, all clients would try to get the block chain from other clients, right? But this would fail. Would the "network" then ...
8
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1answer
369 views

What are the benefits of Invertible Bloom Lookup Tables for Bitcoin?

Gavin Andresen announced a few days ago, that he started working on Invertible Bloom Lookup Tables. His repository's README refers to two papers, What's the difference?: efficient set reconciliation ...
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1answer
104 views

How could block propagation time be reduced?

This website measures block and transaction time propagation.. At the time of writing, the time required for 90% of surveyed clients to get a block is about twelve seconds. (I just averaged the last ...
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1answer
67 views

Is there someway to determine the current network fee from the bitcoin network/daemon?

Is there some way to programmatically extract the current consensus of the transaction fee from the bitcoin network, either by using the daemon or through some other means?
2
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1answer
158 views

Are there any tools to visualize where the transactions are coming from and going to?

We spent some time doing the visualization of the transaction flow between bitcoin wallets https://bitviz.visalyze.com and wanted to know if there are any tools that can not only track, but also ...
3
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1answer
316 views

Created genesis block and set up node. How to mine?

Everything seems to be going well creating my altcoin for fun. I forked the BlackCoin source on Ubuntu, successfully mined a genesis block, recompiled. I bought a droplet over on digitalocean running ...
2
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1answer
185 views

0 Active Connection on my-new-coin

I have compiled my-newcoin-qt and my-newcoind on different platforms (windows, Linux and Mac), with my coin specification based on litecoin. When I run my-newcoin-qt at the first time, I get no error ...
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1answer
69 views

bitcoind has 0 connections

I'm running bitcoind on a remote server (so I can only use the "headless" version). However, the client is not connecting to the bitcoin network. The "getinfo" command shows "connections: 0". I have ...
4
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1answer
390 views

Running multiple BTC nodes on separate VMs on the same host machine?

I've got a server running 24/7 with lots of resources left. I want to run a full Bitcoin node, but actually, I thought of running a few virtual machines on it (using virtualbox) and running a full ...
3
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1answer
56 views

How will the new Internet Neutrality Act affect Bitcoin?

How do you think the neutrality act that is being talked about as I write this post will affect the Bitcoin community. Not only in transactions, but mining, how will it affect Bitcoin economically ...
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1answer
60 views

Curious about a network-based double-spending attack

In their paper Two Bitcoins at the Price of One? Double-Spending Attacks on Fast Payments in Bitcoin, Karame and Androulaki outline a particular race-attack that involves the slight control over a ...
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196 views

How to create a local bitcoin network with 2 peers? [closed]

I want to create a locally bitcoin network. I use testnet and testnet-in-box, both of them working well. but they use the testnet-blockchain, I want to test the real blockchain. so I use two PC, one ...
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220 views

Bitcoin peer to peer network source code

Does anybody know a place to get the source code of the Bitcoin Peer to Peer network? I only need the P2P network portion of the Bitcoin protocol. I am going to implement a new virtual currency. So i ...