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Questions tagged [synchronization]

This is the process of bringing a Bitcoin client up to date with the list of all Bitcoin transactions known as the blockchain.

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How is the progress field of Bitcoin Core's synchronisation/Initial Block Download debug logs calculated?

The debug.log file during Inital Block Download (IBD) typically includes something like the following1: 2023-09-09T10:04:32Z UpdateTip: new best=...
Lee's user avatar
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Sent bitcoin to my new bitcoin core wallet, but not showing up [duplicate]

I am SUPER newbie to this stuff, please help and be patient. I needed a place to send a large bitcoin transaction, and decided to impulsively download bitcoin core to receive it on my desktop. There ...
user152599's user avatar
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1 answer
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Why is there a "progress increase per hour"?

When syncing the blockchain with Bitcoin Core, why is there a "progress increase per hour"? Why wouldn't the syncing rate be constant?
Geremia's user avatar
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bitcoin core 27 initial sync blockchain errors

i was sent here from reddit https://www.reddit.com/r/Bitcoin/comments/1d5wgma/bitcoin_core_27_initial_sync_blockchain_errors/ i did some research and checked the debug.log, it had this error twice: ...
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Do any full-node clients compress blocks?

Does Bitcoin Core or any other full node capable client compress the blocks in transit on the network or locally on the node's filesystem? I used 7z to compress a handful of my locally stored blocks, ...
Geremia's user avatar
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Does Utreexo work with a pruned node?

Does the Utreexo UTXO accumulator work with with a pruned node, or must the entire blockchain be present on my local drive before running Utreexo?
Geremia's user avatar
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If I have corrupt/missing blocks but good a chainstate, why do I need to re-download entire chain?

If I have corrupt or missing blocks but good a chainstate, why do I need to re-download entire chain? Why doesn't it just re-download the needed blocks?
Geremia's user avatar
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why synchronization multibit heavy

I have a Multivit wallet that had some Bitcoin in it, but the synchronization is very heavy. What should I do to be able to send it?
bennaadja abd's user avatar
-1 votes
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Blockchain sync seems to be stuck in a loop?

SOLVED! UPDATE: The issue was not bitcoin related. I had to increase the root partition of ubuntu, as it wasn't using the full SSD size I had, but only 100 GB and the sync therefore ran out of space ...
codepleb's user avatar
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2 answers
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If multiple nodes start at different points, so do we need to sync the nodes so that they are operating at the same time

From Can multiple candidate blocks be mined concurrently by the miner, even if at the end only one block gets added to the chain every 10 mins? Time sync between nodes: If multiple nodes start at ...
RedGrittyBrick's user avatar
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Can multiple candidate blocks be mined concurrently by the miner, even if at the end only one block gets added to the chain every 10 mins?

I read that every 10 minutes, the miner would fetch txs from the tx_mempool, process them, create a candidate block, do the proof of work and then broadcast it to the network. Does this mean that the ...
Geek's user avatar
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Would it be possible to sync a new node without it being connected to even one unpruned node?

There are some Proof-Of-Work chains where pruning is default on their nodes, i.e. the network does not rely on full unpruned nodes at all: Due to the pruning mechanism, Kaspa nodes only needs ~3 days ...
John Smith's user avatar
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104 views

Stuck on "Replaying Blocks" 100% after a forced close

I have had issues downloading Bitcoin Core, where the download would get stuck/frozen and not progress for hours. The last time this happened I closed the Bitcoin Core window and was met with a "...
SoRuud's user avatar
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1 answer
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How can I check the balance of a 10 year old wallet that can't sync?

I have a very old PC that blue screens every time I try to sync bitcoin core and I was wondering if there was any way I could check the balance of the wallet before I destroy the PC? It has 10~ ...
Anon's user avatar
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Load balancing for using more than 1 Internet connection to speed up Initial Block Download (IBD)

Have invested in good networking hardware and researching on failover scenarios using 2 connections - the home broadband and mobile LTE one - as well as load balancing to increase download/upload ...
jurijus01's user avatar
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Should I stop bitcoind when backing up chainstate/ and blocks/ directories?

This is how one might back up their Bitcoin Core data directories in order to save time on syncing in the future: #!/usr/bin/bash local_d=/root/btc_db rsync -av --delete chainstate "$local_d&...
John Smith's user avatar
3 votes
1 answer
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How does the initialblockdownload field in the getblockchaininfo RPC work?

Let's say I have a fully synced node that returns "initialblockdownload": false. If I turn it off, will it show "initialblockdownload": true when I start the node again? In other ...
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High end electrum servers directly reading blk.dat files

These days, high end electrum servers directly read blk.dat files straight from Bitcoin Core's blocks folder in the process of creating their initial internal indexes. I guess they also do in the ...
RooSoft's user avatar
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16 votes
1 answer
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How does block synchronization work in Bitcoin Core today?

When a Bitcoin (full) node connects to the network, it has to synchronize its blockchain with its peers, i.e. learn about the best chain the network knows. There are many aspects to this (learning ...
Pieter Wuille's user avatar
2 votes
0 answers
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Headers-first sync and malicious peers [duplicate]

Since headers-first syncing specifies that the entire header chain is downloaded from a single peer, how does the downloading node know that it is not being served a manufactured out-of-consensus ...
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Block Stuck With Bitcoin Core Need Help

I have bitcoin core version 25 and the blockchain is fully synchronized. Every 2-3 days I open up core to sync with the newest blocks. When i am syncing the newest blocks from the past few days the ...
John's user avatar
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In Bitcoin Core, are blocks sent in parallel or in series?

Are blocks sent in parallel or in series? I would also like to know about the implementation part of Bitcoin Core.
masuda's user avatar
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Bitcoin core synchronizing gets stuck on block [duplicate]

I have bitcoin core version 25 and the blockchain is fully synchronized. Every 2-3 days I open up core to sync with the newest blocks. When i am syncing the newest blocks from the past few days the ...
John's user avatar
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Formatting an external ssd

2 questions about bitcoin core i formatted the ssd and used exfat, i'm using windows, should be ok, right?? or should i cancel my block download remove Core reformat the drive to NFTS and start again ...
Eric's user avatar
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How to avoiding restart of Initial Block Download after rebooting bitcoind

I successfully completed the Initial Block Download (IBD) with bitcoind, which took about two weeks. However, after shutting down and restarting bitcoind, it seems to have initiated the IBD process ...
Kevin Yin's user avatar
2 votes
1 answer
937 views

Bitcoin Core really slow to sync recently

Apologies if this is not the right place to ask for help with this, but I don't know where is. I have a Bitcoin Core full node (Windows 11), but one that doesn't run all the time. Node is not pruned, ...
Mihail's user avatar
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2 votes
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137 views

Bitcoin core syncing txindex stalls

Bitcoin core bugging out since what I assume was a bad shutdown. Mostly fixed (I think) but stalling trying to resync txindex. Here's the history: Core wouldn't connect to peers or load the latest ...
JDX's user avatar
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Downloading of Bitcoin Core node stopped at 65.5%

My downloading of Bitcoin Core node stopped at 65.5%. I'm new to coding, but checked debug.log anyways and got the following ream of error messages: 2023-10-06T01:58:47Z ERROR: ReadBlockFromDisk: ...
Il-Kyu Han's user avatar
1 vote
2 answers
720 views

Detect when it is safe to 'stop' the Bitcoin Core Daemon, bitcoind

Previously, I kept the Bitcoin Core daemon running 24x7, however recently I've become less interested in keeping it running all the time, and would like instead to run it for as much time as it takes ...
Hannah Vernon's user avatar
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I downloaded blockchain completely, but now trying to open Core, starts download "all" blocks again. Why doesn't it see data file, with block history?

Windows 10, external 1TB HDD SSD: I accidentally clicked "Reset Options" becomes in Core, within the Settings menu. In the data file, there are still blocks downloaded from every day of the ...
Felix's user avatar
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Bitcoin Core resynching after updating from 0.19 to 25.0

Similar to this post after upgrading Bitcoin core from version 0.19 to 25, it is re-synching and ignoring the already synched blocks. This is a quite a large version jump, there doesn't seem to be a ...
leo_cape's user avatar
1 vote
1 answer
99 views

Why do I need to download the entire blockchain for a wallet when I can make one one with open source java like bitaddress.org

Like title said. And when i will have to use the btc I can login the wallet with the private key on a hot wallet.
Papi's user avatar
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2 votes
1 answer
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Is there a way to download blocks from scratch without downloading block headers first?

I would like to know if there's a way to download a blockchain without knowing block headers. This could be achieved by asking NEXT_BLOCK_HASH from the genesis block. But is this even possible ?
Loopite's user avatar
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Can nodes that did not finish IBD import mempool using the importmempool rpc?

Sometimes you might want to experiment with the mainnet mempool but unfortunately your node has to finish IBD up to the latest chaintip for you to fill up your mempool.
Abubakar Sadiq Ismail's user avatar
6 votes
1 answer
908 views

Why is my sync slow even with a dbcache of 16000?

We know that initial sync takes ages especially after 500-600k blocks. I get 500k in 30 hours, but now when I'm standing on 600k block syncing is quite slow, it took a couple of days to reach that ...
javierMarquez's user avatar
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0 answers
109 views

Slow Fulcrum indexing

I write here because I haven't found any other notions about it on the web and it's been 10 days since my node running fulcrum has indexed the synchronized blocks at a low speed (~14.3 blocks/min) at ...
nico's user avatar
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Bitcoin Mainnet Initialization Crash

I am trying to initialize a fully functional working mainnet node. The initial download with bitcoind works fine until the cache reaches around 600MiB. After which it crashes. The entire 600MiB is ...
Sumitava Biswas's user avatar
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0 answers
39 views

When does a Bitcoin Core node first start getting inbound peers?

It is my understanding that a fresh node will only make outbound connections during IBD and not advertise its own IP address, yet. Since other nodes will only advertise IP addresses that they learn ...
Murch's user avatar
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1 answer
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How to download full BTC chain with limited internet

I am running linux mint on a laptop with an external ssd, and want to set up a full BTC node. My problem is that I only have jetpack internet which won’t handle a full sync in one go. I can take my ...
user143935's user avatar
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0 answers
65 views

Bitcoin dont start sync

My node stopped, bitcoin core does not start synchronizing. I opened the bitcoin log and found this error: Does anyone have a solution?? i2pd_daemon_1 | 05:58:04@64/error - SSU2: RelayIntro unknown ...
Texugo's user avatar
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2 votes
0 answers
47 views

Is there a way to schedule bandwidth-intensive functions of bitcoind?

Some Internet service providers have different pricing at different hours. Is it possible to limit some functions of bitcoind to specific time ranges? ...especially initial block download (IBD) and/or ...
Robert Dickinson's user avatar
1 vote
1 answer
105 views

About missing utxo in chainstate

I'm trying to obtain up-to-date database of the UTXO and keep updating it as new block is added. And for this, I want to use chainstate as a starting point of synching. I parsed chainstate to obtain ...
Jin's user avatar
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0 votes
1 answer
143 views

Mainnet node sync really slowly with 12 tb seagate external hdd says data rate is 6gb/s

Hi my node is syncing really slowly I have the datadir in an external hard drive connected through usb. Says the data rate for this seagate 12TB is 6Gb/s but the syncing is slow in comparison to when ...
meanthatmuchtoyou's user avatar
1 vote
0 answers
48 views

Bitcoin blockchain doesn't continue installation

I successfully downloaded the Bitcoin blockchain on an external hard drive (as well as git repository). It was working and syncing just fine. I haven't used in a month or so, now the blockchain won't ...
Kibnakamoto's user avatar
0 votes
3 answers
148 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 ...
Son Kaos999's user avatar
-1 votes
1 answer
502 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 ...
Wisdomson's user avatar
3 votes
2 answers
307 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 ...
Rits's user avatar
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3 votes
2 answers
431 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 ...
Murch's user avatar
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0 answers
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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, ...
CullerWhale's user avatar
15 votes
2 answers
1k 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 ...
Son Kaos999's user avatar

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