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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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-...
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bitcoin core : code released after the rescan ! problem in that?

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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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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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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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 votes
4 answers
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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

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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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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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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how long to resync with txindex on raspberry pi 4 with USB3 HDD

I already have a 1.00 node. But now Im considering to have txindex too for LND. Are there any guesses for how long will the resync take on raspberry pi 4 with USB3 HDD?
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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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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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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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If I plug a node into another computer does it have to reindex?

imagine you have a Bitcoin Core node synced 100% working fine, its installed in a portable SSD on your laptop. If you want to use this SSD on your desktop, will it boot normally or will it go throught ...
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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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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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Making regtest's generatetoaddress work with blocksonly=1

I'm setting up a regtest scenario in which I want to send transactions which should be included in new blocks created via the generatetoaddress RPC call. However, I want to disable transaction ...
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How to sync AirGap Vault with its Wallet

How long does it take to sync AirGap Vault/Wallet together and does the syncing process require internet? And is it possible to sync Airgap Vault with electrum wallet?
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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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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/...
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1 vote
2 answers
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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
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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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439 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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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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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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2 answers
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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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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 ...
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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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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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3 votes
2 answers
500 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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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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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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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
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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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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 ...
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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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350 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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Will Upgrading Ram on Low End PC Make Core Sync faster?

I am a newbie to bitcoin. I am trying to sync a full node on my low end PC: 2g RAM, dual-core 2ghz, 250 gb regular HDD. It is in pruned mode. The initial 15% synced in a few days but now the process ...
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1 vote
1 answer
167 views

How to improve bitcoin-qt when downloading blockchain? (very technical, dev views appreciated)

GitHub suggested discussing here before bothering developers with an issue. So be it! :) I'm running Bitcoin Core Version v0.20.1 and Linux Mint 18.3 on crappy old hardware. Pruning blockchain to 2 G ...
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1 vote
0 answers
63 views

Initial blockchain sync stuck on block 237158

Stuck on block 237158. Rebooting doesn't work. Do I need to start from scratch? admin@raspberry2bit:~ $ sudo tail -f /mnt/ext/bitcoin/debug.log 2020-10-26T08:48:30Z Loading addresses from DNS seed ...
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Blocks seem to store only txIDs, where does the transaction data come from for IBD?

I know that blocks store transactions. After looking into a block, I can see that it only stores txIDs. Question 1 - Where are actual transaction objects stored? If you tell me that it's stored in a ...
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3 votes
2 answers
1k views

Download blocks in blk00000.dat format from a specific period

For study purposes, I would like to download blocks from a specific period, i.e. January 2017 - June 2017, in blk.dat format (blk00000.dat, blk*.dat). I downloaded blockchain.core but it makes me ...
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