Questions tagged [nodes]

Questions concerned with (full) nodes, i.e. relay points in the Bitcoin network.

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33 views

Do local nodes work across crypto types?

Newbie to all of this, hoping you can help with what is probably a "duh" question. I'll keep it brief, though: if I download the blockchain using the instructions given for the Bitcoin GUI, will I be ...
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425 views

Can we shutdown the Bitcoin blockchain?

I maybe wrong but what I think is the blockchain ledger exists as long as there are active nodes in the network. So can the Bitcoin blockchain be shutdown by shutting down power supply across the ...
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208 views

Is it possible to share blockchain data between multiple nodes?

I'm planning to create a Raspberry Pi Cluster in order to run several bitcoin nodes. Can I share parts of the ~/.bitcoin/ folder in order to not have to store the entire hundreds of GB for each of the ...
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203 views

How can I run a light (SPV) node on Linux?

I tried to sync the blockchain and, though I have ample free disk space (>500 GB on my computer, the chain is ~265) I've been having a hard time. So, how can I use an SPV node to send transactions and/...
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102 views

A question about transaction broadcasting and block creation

Let's say we have transaction X and transaction Y. The timestamp of X is chronologically earlier than that of Y. X's spender broadcasts X to the network and the same goes for Y's spender. Let's say ...
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59 views

How do lightweight nodes and SPV wallets calculate balances?

Can they do it? Or they "talk" to a full node for that purpose and are used only for mining purposes? Thanks in advance for your answers.
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18 views

My bitcoint-qt client is crashing due to insufficient file descriptors repeatedly even after I set the ulimits to 65535

What are the exact resource requirements for a bitcoin-qt client. this is important and hard to find information. In virtualization world those things need to be understood. :) I am running a KDE 18....
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22 views

Where can I find a detailed network protocol spec? [duplicate]

I have been trying for a while to understand how the bitcoin network works, which I (kind of) do on a high level. However, all of the sources I read don't go into the details of the protocol that ...
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105 views

Running two nodes on the same network

Running multiple Bitcoin nodes on same network That post discussed it, but I need a little more help than that. I am not totally sure what to do with the config file and the add node. Where can I ...
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2k views

Bitcoind Node crashes after using -dbcache option

I've been trying to speed up my node sync by increasing the dbcache. However my node tends to crash overnight. My system is running ubuntu 18.04, 4GM of ram bitcoin core v0.18. I've tried bitcoind -...
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1answer
103 views

How to prevent specific method calls to bitcoin node

I have setup a bitcoin node and can access RPC methods via curl or bitcoin-cli. Now I don't want to share the node with multiple parties and in such case, I want to restict some functions from being ...
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94 views

What would happen if you tried to follow two Bitcoin blockchains from the same computer? [closed]

This will probably sound stupid but what would happen if you create an entirely new Bitcoin block chain and run it on the same computer. How does a node know which version of the Bitcoin block chain ...
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Can I connect to a node as read-only?

In my Electrum wallet I can open the Network Window and view Nodes I'm connected to. Here's an example: electrum4101870.fullhealth.net. I can also find public nodes at https://bitnodes.earn.com/nodes/...
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2k views

What is a txn? How can it be invalid?

I read this in a IRC exchange: verifies your txns against a random node that you don't control. if for some reason that node went rogue, you might have accepted an invalid txn What is a txn?
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1answer
356 views

Why isn’t connecting to your own local node a common feature for Bitcoin clients?

I come from the Monero community and connecting to my own local node running on my home PC is very simple whether it’s on the GUI, CLI or a mobile wallet. Why does Bitcoin not have the ability to do ...
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97 views

How many nodes is too many?

Has anyone done the math on this? For example, if we had 10’s of millions of nodes all connecting to 8 peers would there be some latency issues in propagating blocks across the network in the 10 ...
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263 views

bitcoin full nodes vs simplified payment verification

Why do individual nodes run "full nodes" that keep track of the entire blockchain whereas mechants can get away with "lite node" that implements "simplified payment verification" needing to examine ...
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4k views

Unable to bind any endpoint for RPC server

I recently updated my bitcoin docker image to bitcoing v0.18.0 version and can't allow external rpc connections to it now. It binds to localhost if I set rpcallowip=X.X.X.X, then I tried to used ...
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78 views

How is pool hashrate share name known?

Since it’s not possible to know mining pools nodes addresses, how do we know the that a specific node owing 15% of share belongs to btc.com for example ?
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25 views

Is it possible to get the full list of synced nodes ɪᴘ on the network?

There are many website like https://bitnodes.earn.com/ but I’m failing to understand if they collect nodes from compulsory submission on the web interface for statistics purposes only or they use a ...
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Is 10K full nodes enough to bitcoin to avoid 51% attack?

As I know bitcoin has about 10K full nodes. And the question is in my mind is that: This number is not huge! If someone has 6K servers, Can control the bitcoin via 51% attack? I was thinking if ...
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40 views

Bitcoin-Qt [11690]

I found this on my mac computer what is the meaning of this can you pls hep me to understand I am new to this; Process: Bitcoin-Qt [11690] Path: /Applications/Bitcoin-...
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1answer
65 views

Can't connect to bitcoin lightning node

Am trying to connect to https://1ml.com/node/02671251b5678771514df8f26cc01508606d697ae8cad38063f84becbd359b189f From eclair app https://imgur.com/gallery/GoAMpjp it keeps saying failed to open ...
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Wallet error ErrorFile=.... /testnet3/wallets/db.log

I want to use two deamon for sync mainnet and testnet. I Run $ bitcoind for mainnet without problem After I run $ bitcoind -testnet But I get this error BerkeleyEnvironment::Open: LogDir=/home/...
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406 views

Bitcoind doesn't start

Im trying to make Stadicus guide work for both Bitcoin Core & LND I did download the blockchain and moved to the HDD on my Rasp3 However, when starting the bitcoind service, im having this debug....
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163 views

Does a Node connect to all the peers?

Does a Node connect to all the peers in the network? Or just a few? If its just a few, how many? If its just a few, what about if all of those nodes in the list are malicious?
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Blockchain, correction of blocks

How do a malicious nodes correct their blockchain if they have it wrong? If they don’t want to fix it, what happens then?
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106 views

Private Blockchains: Validation

I'm a software developer, and I have some questions about private blockchains, I'd like to have technical answers since I'm trying to understand blockchain at a code level. I'm going to write a ...
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1answer
458 views

Checking whether lightning node is online/visible

I just created my first lightning node and already have one active connection. My problem is however, that I do not see my node in any lightning network explorer. Is it possible to somehow check ...
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1answer
47 views

What happens to .blk files on disk when the Bitcoin daemon switches to a longer chain?

I’m interested in writing a program that will (1) parse the .blk files that my full-node Bitcoin daemon writes to disk and (2) write them to a relational database in an incremental fashion (i.e., ...
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139 views

Is it possible to create a wallet service, which doesn't have all the blockchain downloaded?

Is it possible to create a wallet service, which doesn't have all the blockchain downloaded? Like not running a full node itself?
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1answer
732 views

How is node capacity determined on 1ML.com?

I have set up a Casa node, using lnd, and opened 15 payment channels. The capacity of my channels, after almost 3 weeks, is exactly what it was when I opened the channels, leading me to believe that I ...
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164 views

How does bitcoin broadcast information?

On Bitcoin's Blockchain, how is information transmitted instantly to all other nodes and do nodes 'talk to each other' through an API? Do Blockchain nodes communicate with each other through HTTP ...
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35 views

How does the Bitcoin network maintain the chains created when two nodes generate different versions of the same block?

I came across these lines from the Bitcoin whitepaper: If two nodes broadcast different versions of the next block simultaneously, some nodes may receive one or the other first. In that case, ...
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69 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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140 views

Bitcoin full node sharing blockchain

Does anyone know how one might run two bitcoin full nodes on the same machine with both these nodes sharing the same blocks and chainstate files, is a symlink to these files enough or must something ...
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1answer
49 views

How is the Bitcoin node network different from the IOTA network? [closed]

I asked this question on IOTA's forum here: Real incentives for running a full node? One of the founders from IOTA Come-From-Beyond (Sergey Ivancheglo) responded with this comment: "However, ...
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1answer
349 views

Why would running a light node riskier and subject to more frauds than a full node? We don't NEED a full ledger, do we?

I've been reading on light node and many have pointed out that the light node doesn't have the full blockchain and is riskier because they can't verify the transactions fully. First, we can verify ...
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171 views

Why can't an ISP ban access to a blockchain network? [duplicate]

I read that blockchain sits on top of the internet and is decentralised. We still have to access the blockchain network via an ISP. Without ISP, we can't access the internet so why can't an ISP block ...
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2answers
173 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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141 views

What percentage of nodes currently support segwit?

What percentage of nodes currently support segwit? It seems Bitnodes could figure this out, but I can't find such a stat on its website.
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How do you download blockchain data (transactions etc.) using a node? Best ways to get a node?

I am just curious how one can download bitcoin data and blockchain using a node. Where should I start?
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45 views

How to set up a gateway node?

I have two nodes running in my local machine. one public facing and another connected ONLY to the public facing node. I ensure they are whitelisted and in different ports. the nodes connect just fine, ...
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1answer
892 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.
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33 views

How many unit test should be run after building a node?

After building Bitcoin ABC and running make check, I get this: # TOTAL: 1 # PASS: 1 # SKIP: 0 # XFAIL: 0 # FAIL: 0 # XPASS: 0 # ERROR: 0 Is that correct?
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85 views

Ardor configuration settings to connect to remote node without downloading entire blockchain locally

What configuration is required to run the Ardor wallet software without downloading the entire blockchain, but only connect to a remote node?
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1answer
48 views

How does a new node know where to connect to initially? [duplicate]

Is there a default (centralized) set of IPs that a node connects to when it's just starting up for the first time, in order to get the list of other nodes' Ips? What happens if these initial IPs are ...
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1answer
959 views

Can you run a bitcoin lightning node on a raspberry pi zero?

Will a bitcoin lightning node run on a raspberry pi zero? Does it have to have the full Bitcoin blockchain synced or can it connect to a remote node? Also what are the minimum requirements to get a ...
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86 views

structure of communicating with bitcoin DNSs to get list of nodes

I want to communicate with bitcoin DNSs to get list of bitcoin nodes. for now I want some example and structure of messages between I and bitcoin DNS. I found two DNS names: dnsseed.bluematt.me ...
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702 views

When a node receives a transaction, what steps does it do to verify that transaction?

I know that it verifies the block hash by calculating each hash of the contiguous blocks in order, but does it verify the balance of each wallet sending the transactions as well? And does it do the ...