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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3 answers
72 views

Weak Subjectivity Checkpoints trust assumptions

With AssumeUTXO it should be possible to sync to chaintip from a recent snapshot of the UTXO set, rather than from the genesis block (although there's background full validation after sync). This is ...
-1 votes
1 answer
48 views

My multibit core synchronization is stuck Whats the reason [duplicate]

For the past six days since I downloaded the multibit core, I wanted to recover my wallet I still have my recovery phrase and password, and open the multibit core and the wallet was synchronization ...
3 votes
2 answers
210 views

Downgrading Bitcoin Core 24.99 (latest source code) to 24.0.1

I wanted to build Bitcoin Core myself, so I followed this official guide, but in the process I failed to realize that by cloning the git repo I would just get the latest source code, not the latest ...
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3 votes
2 answers
186 views

What could be the reason that my node syncs so slowly during Header Synchronization?

I¹ am trying to sync Bitcoin Core v24.0.1 on my Desktop with 16 GB RAM and an Intel Core i7-7700HQ processor, but it is taking forever even to get past the header synchronization. It tells me that it ...
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0 votes
0 answers
30 views

How long does it normally take to set up a test node? How much of your disk is utilized?

I did a complete factory reset on my computer and simply started over. I have a Aorus 5SE with windows 11. I am using VirtualBox 7.0.6 and Ubuntu 20.04. My new virtual machine has 4GB of base memory, ...
14 votes
2 answers
927 views

Why is witness data downloaded during IBD in prune mode?

Why do pruned nodes download (segregated) witness data during IBD if much of that data is marked as Assumevalid? These nodes seem to be downloading witness data just to prune it. Since we already know ...
0 votes
0 answers
170 views

Is it true that Taproot accidentally now allows for NFTs stored on chain up to 400kB per NFT? And is there no solution/mitigation defined yet? [duplicate]

This post raises some questions: https://twitter.com/pourteaux/status/1618364013712375810?t=uHlLpWVz_ACFPrKAwF68XA&s=19 My main question is whether the above post actually constitues a correct ...
2 votes
1 answer
50 views

Why is there a need to flush the UTXO set when you prune blk*.dat and rev*.dat files during ibd?

As I understand, when Bitcoin Core has pruning turned on, it will flush the dbcache when it prunes unnecessary blk*.dat and rev*.dat files during ibd. In https://bitcoincore.reviews/20827, it states: &...
1 vote
1 answer
40 views

Does pruning during IBD reduce the ability to utilize the dbcache fully?

I'm running IBD on a machine with 8GB ram with prune=550 and dbcache=7000 and noticing that memory usage is not going above ~880mb. Seems unusual and I assume it's related to pruning. I found a ...
0 votes
1 answer
42 views

Bitcoin Core download crashed

I was adding a new drive to my PC when Bitcoin Core download crashed ..no idea why, anyway I cannot reboot and have no access now, I was in the middle of slowly downloading the blockchain to get ...
0 votes
1 answer
96 views

Often seeing Rewinding blocks... and Loading block index

Every so often I see these error messages in Rewinding blocks... and Loading block. What is the cause of those error messages? I am using the core wallet.
6 votes
3 answers
299 views

Skip IBD on pruned node?

I'm trying to run a light bitcoind node for testing purposes on mainnet, with minimum startup time. ./bin/bitcoind \ -prune=550 \ -txindex=0 \ -assumevalid=...
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0 votes
1 answer
124 views

Stop and Restart Service while BTC Core Syncing?

Is it possible to start and restart the Bitcoin Core service during the syncing process without loss of work? What happens to syncing if the Server fails or shuts down, i.e. a power failure? I would ...
0 votes
0 answers
45 views

Recover an implement old Multisignature Wallet with different Keys

I have a problem with a multisig wallet. The keys are no longer accepted by the console. Only a part of the keys can be inserted. The wallet is then also displayed to me. What happened afterwards is ...
0 votes
1 answer
48 views

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
143 views

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 ...
1 vote
0 answers
48 views

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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1 vote
0 answers
139 views

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, ...
0 votes
0 answers
311 views

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
262 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 ...
0 votes
0 answers
12 views

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; ...
2 votes
1 answer
86 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
524 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 ...
0 votes
2 answers
85 views

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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1 vote
0 answers
28 views

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 ?
0 votes
0 answers
22 views

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 ...
  • 1
0 votes
1 answer
429 views

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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1 vote
0 answers
67 views

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
0 answers
65 views

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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0 votes
0 answers
115 views

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?
0 votes
2 answers
252 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
123 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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0 votes
0 answers
36 views

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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0 votes
0 answers
72 views

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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0 votes
1 answer
457 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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0 votes
2 answers
190 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
610 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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0 votes
0 answers
70 views

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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2 votes
1 answer
148 views

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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0 votes
1 answer
45 views

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 ...
  • 161
0 votes
1 answer
72 views

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
206 views

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 vote
1 answer
51 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
626 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
249 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 ...
0 votes
3 answers
108 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
0 answers
700 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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0 votes
1 answer
275 views

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
146 views

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 ...
0 votes
1 answer
83 views

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 ...

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