Questions tagged [synchronization]

This tag should be used for questions about synchronizing a Bitcoin client. This is the process of bringing a Bitcoin client up to date with the blockchain.

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Bitcoin-qt exits silently after syncing blocks until before 24 hours

I shutdown bitcoin-qt (version: 23.0) around two weeks back. Now when I relaunch it, it syncs blocks until 24 hours and then silently exits. debug.log file contains the following as last line - 2022-...
1 vote
1 answer
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Bitcoin core unable to write cache to disk

I have been fiddling with this error for a little bit now and wondering what's going wrong. I'm running a testnet instance of Bitcoin Core on a relatively low-spec EC2 instance (2MB ram, 40gb disk) It ...
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Bitcoin Core: estimated time to synced, without GUI

I enjoy how the Qt program reports how much time remains to complete the chain synchronization, but I don't know how to get that without using the GUI. Can you configure bitcoind to report that? Can ...
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Error `settings.json file has no read or write access` - but permissions OK

I was downloading the whole Bitcoin blockchain and the download stopped and I got an error message that the settings.json file has no read or write access, but I checked the permissions of the file, ...
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Can Bitcoin Core Blockchain initial sync time in BitcoinQT be sped up?

Given the following platform hardware and internet data speed (provided below), what settings are recommended for fastest possible blockchain download and sync? This is the hardware I'm running: Note:...
2 votes
2 answers
124 views

Why does CLN (Core Lightning) sync from Genesis while LND only syncs from the wallet's birthday?

I've installed two major Lightning Network implementations, CLN (formerly c-lightning) and LND, with bitcoind testnet as backchain on the same server. On the first startup I noticed CLN synchronizes ...
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bitcoinj startAsync() causes app to fail repeatedly

I have no experience with android programming. I am just trying to build a simple wallet. Following is the trial code: import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; ...
1 vote
1 answer
38 views

Unprune & Re-Download Failed. Core asks for a "-reindex" due to chainstate, then fails

I was attempting to return from pruned to unpruned chainstate. Unchecked the pruned box. Core cautioned this would require re-download of the blockchain in its entirety. OK, fine. Shutdown Core to re-...
2 votes
1 answer
255 views

What should I do about these messages in Bitcoin-core's debug-log?

Help, with bitcoin core : AFTER the Rescan : 1 - rescan 2 - response output, on the debug file out: 3 - FlushStateToDisk: write coins cache to disk (coins, kB) completed (s) , OK 4 - Imported mempool ...
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2 answers
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Why Don't Nodes Download Blocks off the network directly instead of sending various messages to other nodes?

My understanding of updating a node's incomplete blockchain is that: A node with an incomplete blockchain (let's say its been offline for some time) will send a getblocks message and then will receive ...
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How to install Armory Wallet on MAC MINI 12.3.1 MacOS Monterey?

How to install Armory Wallet on MAC MINI 12.3.1 MacOS Monterey ?
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Bitcoin Core shows 1 year and 21 weeks for synchronization when using an external disk [duplicate]

I am getting 1 years synchronization message: and I am stuck on January 2018 for the whole day. Will it improve, or I have to use a better disk? Is Bitcoin Core unusable with an external disk? Or it ...
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1 answer
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Bitcoin core synchronization too slow, only 16 hours of blockchain in 20 minutes

I have Bitcoin Core stored on my external disk and currently I am on 39%. but the problem is that it is getting slow for some reason. The Bitcoin Core Qt app is constantly beachballing on my Macbook ...
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What do these outputs in the log file represent

I sync the entire bitcoin blockchain. The output log file contains verification information for the block. Which part of the verification does this information represent? For example which line ...
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How to get time left using command line during initial block download?

When using GUI version of Bitcoin Core, time left before initial block download has completed is displayed. Using bitcoin-cli, one can see verificationprogress, but is there a way to get time left ...
1 vote
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Is there a way to sync bitcoin core without verification?

As the question asks, is there a way that one could sync the bitcoin client without verifying all the blocks. During IBD, downloading the blockchain isn't the bottleneck, what takes time is verifying ...
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Why does Electrum never complete synchronization with a server?

How do I diagnose why electrum never finishes synchronizing? I've tried selecting networks individually without success. Can I ping a server to confirm connectivity?
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2 answers
127 views

How long does it take for Multibit to synchronize an old wallet?

I'm trying to restore my old wallet which I had created on Multibit around 2016 and held a fraction of a bitcoin, as far as I can remember. I have not touched the wallet for years until today when I ...
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2 votes
4 answers
109 views

How are funds verified?

I understand that transactions go into mempool and a miner "verifies" the transactions such as ensuring the user has the appropriate funds and correct signature. Specifically, how are ...
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BTC synchronization in Bitcore [duplicate]

I had kept some BTC for for synchronization in BITCORE but now I need money, so want to SELL my BTC but the process of synchronization is still going on..... In that case can I stop the process of ...
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What work is needed to close a block from 2013

Please could you tell me what work is needed to close a block?,also is it possible to to do this while not fully synced?could you also tell me what information would you have to have access the ...
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1 answer
192 views

Time needed for Bitcoin core synchronization

I had put on the process of synchronization on BITCOIN CORE and it has been around 2years since I had started the process and still its not completed, therefore now I would like to put some questions ...
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2 answers
130 views

How can I -abort ./bitcoind -reindex-chainstate?

I made files re-accessible. Now we could return to a later, already synchronized state with the files. I tried to put ./bitcoind -reindex-chainstate=0, also in a bitcoin.conf, also directly calling ...
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1 vote
1 answer
440 views

Is there a faster way to download IBD for bitcoin core?

I am trying to setup a node using bitcoin core https://bitcoin.org/en/bitcoin-core/ but it is taking ages to download. Running for past 2 days and downloaded only 15 % . I have a decent internet ...
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Power outage during Bitcoin Core initial synchronization

I had a power outage when I was half way through my Bitcoin Core initial synchronization. Is there a way to pick up where it left off or do I need to start over?
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1 vote
1 answer
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What happens if a peer doesn't respond to "getheaders" or "getdata" on time?

Suppose a node receives the same "inv" message from many peers. Will the node send "getheaders" requests to all the peers or only one of them? Does the node keep a timer for ...
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1 answer
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Do nodes maintain a download window after the initial syncing?

I was going through the Bitcoin P2P guide. https://developer.bitcoin.org/devguide/p2p_network.html It says that the nodes maintain a 1024-block download window during the initial syncing. However, at ...
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1 answer
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Missing Transaction on older Bither wallet on older computer

Please note I am not that technically savvy nor know that much about cryptocurrency. I am helping out a friend that (for disability reasons) cannot ask himself. My friend purchased and has bitcoin he ...
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1 vote
0 answers
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Can you prune blockchain without redownloading?

I've downloaded the whole blockchain now I want to run a pruned node on another device. But if I klick on prune block storage in bitcoin core, it tells me that reverting this setting requres re-...
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1 answer
50 views

Do peers advertise their chain work?

If yes, is this how a node decides that the peer has the best chain for headers-first download?
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2 votes
2 answers
437 views

Where does a full node get the blockchain from for Initial Block Download?

I understand that a full node needs to do an IBD before being able to verify transactions. So, it downloads the ledger up to now, which is known as Initial Block Download. But what I don't understand/...
1 vote
2 answers
191 views

Can I find the address of my Bitcoin in the debug.log file?

I cannot download the entire block chain (I’ve tried four times now and failed) so I can’t replace my encrypted old wallet.dat file into the blockchain and do the rescan to check my coin balance. My ...
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3 answers
103 views

Can a full node understand the transactions it downloads from the Bitcoin network?

I understand a full node downloads and validates the entire transaction history. Can a full node read and understand these downloaded transactions, or is it just just keeping a copy of encoded ...
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3 votes
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542 views

Raspiblitz slow sync performance

I'm syncing my raspberry pi 4 model B, 4GB and after 4 days I'm less than 50% synced. It seems as though there is something wrong with bitcoind as there are some weird symptoms going on. The pi is ...
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No new UpdateTip. Just "Pre-allocating up to position ..."

I'm IBD'ing a new testnet node 0.21.0 Why are there long periods of no UpdateTip messages? I have 10 connected peers. Excerpt starting at 00:13: 2021-04-05T00:13:17Z UpdateTip: new best=...
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1 vote
1 answer
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Is there some kind of USB antenna I can buy to be able to use Bitcoin even when there is no Internet?

Let's say they cut the Internet tomorrow. I will still have my private keys on my offline computer, but I won't be able to sync the blockchain (as won't anyone else) nor would i be able to make any ...
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1 answer
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Bitcoin Core resume

iam downloading the 350GB Core database via slow network. iam not shure, if an correct resume occurs, if i need to breask the transmission. my question: is there any risk for inconsistence of bitcoin ...
1 vote
2 answers
67 views

Multisig synchronization

I understand what the multisig wallets are but I need help understanding what exactly this script does: https://gist.github.com/gavinandresen/3882537 If I understand correctly, bitcoinds are bitcoin ...
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1 vote
0 answers
48 views

bitcoin-qt 0.21.0 in win10 keep hight disk I/O, and GUI not respond

My OS is win10, and I used to use bitcoin-qt 0.13.0, it was fine but I found it syncs very slow now, so I upgraded bitcoin-qt to 0.21.0. I feel 0.21.0 syncs much faster, but it always keep high disk ...
6 votes
1 answer
1k views

Is there a way to only sync up to a certain block?

I am planning on doing some transaction analysis on the blockchain, however, I only want to do it on a small part of the blockchain first and then run it on the full blockchain later on. I have ...
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2 answers
581 views

Deleting Electrum wallet and setting up new one

I set up an Electrum wallet before I learnt that you should verify the signature. While I went straight to the electrum.org website to download it, I would still like to be secure, just in case. So I ...
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5 votes
2 answers
623 views

Does running a pruned node support the syncing of other nodes in the network?

I decided to prune my Bitcoin core node to 25 GB. With the blocks that the node has in its data directory (the ones that were not deleted), does such a node support the syncing of other nodes in the ...
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1 answer
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Am I seriously going to have to keep this clunky old infernal machine running for weeks upon weeks to sync the blockchain? [duplicate]

Yesterday, I dug up my old computer, set it up physically, installed Linux Mint with full disk encryption, installed Bitcoin Core through its software manager, started it, immediately selected "...
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1 answer
360 views

Why would Bitcoin Core freeze my computer when syncing? And is it supposed to take this long?

24 hours ago, I finally bit the bullet and dug up my old computer, set it up physically, installed Linux Mint (with full disk encryption), installed Bitcoin Core through its software manager, started ...
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0 answers
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To what extent is the actual downloading of blockchain data what slows down a "fresh sync"? [duplicate]

I've just sat an old computer with fresh Linux Mint and Bitcoin Core installed to sync from scratch. Since its HDD is 250 GB, I had to enable "pruned mode" since the blockchain is currently ...
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3 votes
4 answers
198 views

How isn't blockchain fundamentally broken?

This question is a good 3 to 5 years late on the crypto trend but nevertheless I'm still having trouble to understand. The chain works by verifying every previous block, right? How does this not ...
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0 answers
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Bitcoin QT wallet.dat file location? [duplicate]

It's been since 2013 when i was mining bitcoin that i have used and synchronized this wallet. I've tried a few times several years ago but it literally takes days, if not weeks now to synchronize, AND,...
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1 vote
1 answer
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Can I interrupt the initial blockchain download without losing progress?

I just installed Bitcoin Core through brew on my mac. The blockchain is now downloading but it's slowing down, so I would like to restart it. Can I abort the process and restart it and will it pick up ...
4 votes
2 answers
1k views

Why is it bad to download the full chain from a third party with Bitcoin Core?

I know Bitcoin Core downloads and processes the full chain much quicker now than it used to but what exactly is so bad about downloading a compressed blocks, chainstate and database folder from a ...
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2 answers
386 views

Very slow sync on low end PC - what to upgrade?

[Hi, I have to re-ask this question because I cannot recover my account from the last one. Sorry about that.] I am a newbie to bitcoin. I am trying to sync a full node on my low end PC: 2g RAM, dual-...

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