Questions tagged [network]
This tag should be used for questions related to the Bitcoin network and communication between different nodes on the Internet.
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Any privacy considerations regarding allowing inbound connections for a Tor full node?
I wanted to know if there's any privacy considerations to take into account when opening the bitcoin ports on the router for a bitcoin node.
I'm using -onlynet=onion in the bitcoin.conf file and I ...
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2answers
14 views
Is it possible to accurately map hashing power to network size?
Let's say we have a network with n nodes in it. Is it possible, when the hashing power of the network is calculated after a proof-of-work, to accurately estimate n with an algorithm taking the ...
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1answer
26 views
Blockchain endpoint working
I wanna clear this thing that how blocks are retrieved and created in from the nodes using an end point. The end point is basically centralized and have nothing to do with network if i'm not wrong. Is ...
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2answers
50 views
Transaction Relay and trickling in Bitcoin
If a node has 100 connections to other nodes and receives a new transaction using a getData request, it sends an inv message to it's 100 connecting peers correct?
Does it also send the inv message to ...
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1answer
42 views
Possible better peer-to-peer protocols for Bitcoin?
As we know, bitcoin uses flooding in order to propagate blocks and transactions across all the nodes in the network. As it was launched in 2009, it's been almost 10 years since it's launch and I was ...
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2answers
30 views
Would bitcoin core work on a big endian system? Or even a system where C++'s `int` is not 32-bit?
Looking at the source code of bitcoin core, the serialization part, I see that there's no serialization abstraction layer that accounts for a possible different endianness or different binary layouts ...
2
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0answers
33 views
How to get multiple connections to the same node
I'm playing around with connecting my node to another one of my nodes to see how many incoming connections I can handle.
Whenever I add node A from node B with bitcoin-cli addnode 1.1.1.1 add after ...
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2answers
45 views
Networking in cryptocurrency
I am learning and trying to implement my own cryptocurrency and I am thinking about how could I achieve the peer to peer connections.
I read that bitcoin is using DNS seeds for discovering users.
In ...
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1answer
43 views
Is it true that only one message can be sent at a time in Bitcoin Core?
I looked into Bitcoin Core client code, and it seems that there is a lock that allows only one thread to send data (Block, TX, etc.) at a given time point. If this is true, it means that transactions ...
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1answer
222 views
Improvements that could be made to how bitcoin propagates its transactions and blocks?
As of 2018 what are the known improvements that could be made to how bitcoin propagates its transactions and blocks?
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1answer
35 views
Is Bitcoin network an overlay application network?
Is Bitcoin network constructed with just Layers 1-4 of the OSI model? Or it's an overlay application network?
Can someone please explain about structure of Bitcoin network?
Thank you
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2answers
104 views
Possibility of detecting MAC address spoofing in Bitcoin network?
The paper that has been published here: https://dl.acm.org/citation.cfm?id=3282283 proposes a consensus algorithm based on distributed voting process in which it claims that it would be possible to ...
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2answers
115 views
How do block explorers determine propagation through nodes/P2P protocol?
On several Bitcoin blockchain explorers, I have seen unconfirmed transactions given a dedicated "propagation" value that tells a user how much of the Bitcoin network has become aware of this ...
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1answer
27 views
how do bitcoin nodes know about the full network
partitions sometimes occur in a distributed network; when this happens, a node can only communicate to a subset of other nodes in the network and may use a different chain as the main chain; since ...
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0answers
19 views
When an IP address in *new* table is overwritten?
I'm reading the address management of Bitcoin core implementation. There is one thing I couldn't understand is in which condition an IP address in the new table of a node is overwritten?
In ...
2
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2answers
57 views
How do mining pools connect to the Bitcoin network and miners connect to pool?
I couldn't find the answer anywhere so I start a thread.
How do mining pools connect to the Bitcoin network to propagate transactions and blocks? Do they run their own full node? If yes, how many of ...
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1answer
78 views
What is the network topology used at the physical layer of the Bitcoin network?
I want to know about the performance of the Bitcoin Network under various network topology and for which it performs the best. Also what is the current topology being used?
3
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1answer
38 views
How is bitcoind “shy” when exchanging `version` packets?
This is more of a technical/programming question.
I am referring to this line of code: https://github.com/bitcoin/bitcoin/blob/be992701b018f256db6d64786624be4cb60d8975/src/net_processing.cpp#L1699
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2
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0answers
52 views
addnode in bitcoin.conf doesn't work (Regtest mode)
I'm trying to make to nodes on the same computer communicate.
I set up two bitcoin folder with two bitcoin.conf files.
bitcoin.conf in the second node is the following:
rpcuser=bitcoinrpc
...
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1answer
25 views
How a web-service like bitnode.earn can know each node's blockchain height?
How a web-service like bitnode.earn can know each node's blockchain height?
We can get some information of each node in bitcoin network in this web-site:
https://bitnodes.earn.com/nodes/
And, it is ...
0
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1answer
185 views
Can we estimate how many node has the Bitcoin network? [duplicate]
Is it possible to estimate the amount of nodes (hosts) are connected to the Bitcoin network in a given time?
Note: Here node means host.
0
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1answer
28 views
Are sockets kept open when connections are made?
The bitcoin protocol says that any given node is connected to at least 8 other nodes. Does that mean that when a client connects to a node and learns about new peers... will the client keep the socket ...
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1answer
30 views
Is bitcoin running over a structured or unstructured overlay?
How nodes are being admitted to the system? Does each node have a sequential unique address?
In other words, are bitcoin nodes considered structured or unstructured?
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0answers
35 views
How is the network topology of peers ensured to be whole via bitcoin peering?
Say the entire bitcoin network topology looked this:
A -- B -- C
|
D -- E -- F
Then I bring up bitcoin clients on all nodes at the same time and the minimum number of bitcoin peers was only 2. ...
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2answers
180 views
Slow sync running Bitcon full node on Mac Mini OSX
It is Jul 2018, I need help after several attempts to sync a full node running on a Mac Mini.
I have tried several times and Bitcoin-qt starts pretty well for the initial sync, downloading with ...
0
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1answer
123 views
Can't specify rpcport for testnet
Was there a recent change where it is no longer possible to specify rpcport?
I noticed these two warnings:
Warning: Config setting for -addnode only applied on test network when in [test] section.
...
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1answer
29 views
Bitcoin CPFP transaction with zero fee
tx1 - I want to first create tx with 0 fee
On the next I am going to add tx1 as input and add necessary fees into it
the issue is tx1 gets rejected by full node why is that cant I broadcast a 0 ...
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0answers
70 views
Which light wallets actually connect to nodes?
AFAIK, most light wallets are not members of the P2P network, but rather connect to a centralized server run by the wallet developers, which broadcast users' transactions to the actual network.
Which ...
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1answer
36 views
Is a peer connection maintained for the life of the node, or is it recreated on every request?
Lets assume we have 2 bitcoin nodes, A and B. A is already up, and B is now coming up. B lists A as a peer node and attempts to establish a connection. A accepts, a handshake is completed and they ...
3
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1answer
112 views
Obtaining Lightning network graph data
I was wondering if it is possible for me to obtain data about the Lightning network mainnet, particularly the nodes and the edges (channels) in the network. I know that the graph is visualized in ...
2
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1answer
51 views
How would a governmental Bitcoin ban work in practice?
How does a potantial Bitcoin ban work in practice in a regime that a.) at least partially allows access to the Internet, and b.) has at least one payment system that is not closely monitored by the ...
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1answer
152 views
How do bandwidth requirements for running a full node grow with blocksize?
I know they increase.
I'm looking for something more precise than that.
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1answer
95 views
When ipv6 is enabled my ipv4 address does not appear in getnetworkinfo localaddresses
After enabling ipv6 (Google WiFi/Ubuntu 16.04) I noticed that my node's upload bandwidth dropped a lot. Investigating showed:
ifconfig lists one ipv4 address and three ipv6 addresses.
bitcoin-cli ...
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1answer
586 views
How can I use Bitcoin privately with the Electrum wallet and Tor?
I do not want to run a full node like Bitcoin Core but still want privacy running an SPV node like Electrum wallet to use Bitcoin.
How can I setup to run Electrum privately with Tor?
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1answer
207 views
Error connecting to json rpc server
For testing purposes, I need to connect from a web page in my shared hosting account (on the public internet) to my json rpc server which is running on my laptop . So bitcoind is running on my laptop, ...
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1answer
60 views
Does Bitcoin limit the number of parallel connections from the same IP?
Is there a measure in place to prevent an adversary from connecting to a Bitcoin node many times in parallel, thus saturating its open connection slots?
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1answer
36 views
Requesting Blocks
I've been thinking about this for a while and can't seem to understand part of the network.
Lets assume that I'm a node that has been offline for 5 months and I want to retrieve the new blocks. When ...
0
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1answer
47 views
How does blockchain ensure that a closed loop in network is not formed?
Suppose there are 9 nodes and each node can connect to 8 other nodes. All these 9 nodes connect to the 8 others. Then when a new node comes where does it connect to in this case? All the current nodes ...
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0answers
28 views
After IP sent from A to B, can it be sent through same connection from B to A?
The paper "Deanonymisation of clients in Bitcoin P2P network" describes a method for learning a set of immediate connections ("entry nodes") for a Bitcoin node. The naive approach ("which IPs relayed ...
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0answers
27 views
Teredo IPv6 nodes: duplicates?
I am doing some research which involves crawling the network for reachable peers (similar to what Bitnodes does). I get more or less the same results as Bitnodes (see their latest snapshots), but with ...
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1answer
39 views
What is the purpose of addr_from and addr_recv in version message?
I understand from this answer the semantics of addr_from and addr_recv. It is not clear to me though what is their purpose. Don't we assume that the transport layer protocol takes care of, well, ...
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1answer
34 views
Portability of Bitcoin Wallets: What If The Power Or Network Is Out?
My understanding is that the blockchain is public and contains balances (or the monetary value) and that a private key, or a wallet, enables one to control or spend bitcoin.
If my wallet (private key)...
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1answer
24 views
Where do transactions get sent?
Related: how do transactions get to miners, but I'm looking for a slightly (and only slightly) more technical discussion.
Say I download a lightweight bitcoin client and set up a wallet on machine A. ...
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0answers
26 views
Network usage when mining
I'm interested in how active a user is on the network when they're mining for new bitcoin via a full node (not internet based pool or something). I know there's an initial syncing period to catch up ...
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2answers
99 views
What cryptocurrencies are there with a financial incentive to run a node?
I have a very naive question: Are there any distributed cryptocurrencies with a financial incentive to run a node?
I know that cardano ada has financial incentives to run nodes, as they pay a part of ...
2
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1answer
247 views
what is nMinimumChainWork?
I was trying to run my own private bitcoin network, so I downloaded the source and compiled it, then I started two bitcoind instances in two docker contains, and I made sure they did not connect to ...
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0answers
53 views
2 nodes connected to eachother only showing outbound?
After setting up 2 separate VPS' (Ubuntu 16.04) I can't seem to connected them succesfully.
They see each other, ports are open, but when running altcoin-cli getaddednodeinfo or getpeerinfo, they ...
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1answer
20 views
Can we predict about bitcoin network? [closed]
What will happen to the bitcoin network once all 21M of bitcoins have been mined? The bitcoin network will cease to exist? or the bitcoin network will continue to function the same way with miners ...
2
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1answer
122 views
Regtest automated peer discovery
I want to test peer discovery in regtest mode of bitcoin core, running in Docker.
However, I noticed in the source code of bitcoin core that there is a check if the address is routable before ...
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1answer
3k views
How can I setup Bitcoin to be anonymous with Tor?
Bitcoin is billed as many things, among them its anonymity is highly regarded. While it is true that a transaction does not identify a user or wallet, recent news shows that there is the potential for ...
