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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1answer
35 views

How to detect that full node is in sync (using jsonrpc)?

I have full bitcoin node available through jsonrpc interface. How my app can detect if this node is in sync with the network?
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Pruning Blockstore has been running for days

After activating the core (Testnet - Pruned) with the command bitcoin-qt i received the following error: Corrupt Block Database I restarted the synchronization always using the Pruned mode. The core ...
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1answer
103 views

Missing transaction in newly installed Bither wallet

On bitcoin.org I learned about the Bither wallet. I installed it, created an HD account, and replenished the wallet sending to the address 19QpMgv2N2hSJNq6Nrkg1rzJ1Fc9s2Pjbf. As can be seen, the ...
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17 views

Bitcon core wallet showing zero after synchronization

My father tried to sync his Bitcon Core wallet and he doesn`t know why synchronization lasted for shorter time than the wallet had estimated before. After synchronization the wallet showed crash and ...
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0answers
46 views

Bitcoin Core wallet fails to load and requires reindex after I already did it

My Bitcoin Core is synchronized. But I can't open a wallet, it says that I might need a reindex. Though I already did it. Also I can't do dumpprivkey because it says that no wallet is loaded. How can ...
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1answer
96 views

Downloading the pruned blockchain file directly from external source

Using the bitcoin client to have a pruned version of the blockchain can take a lot of time, I was wondering what would be the drawback to simply download an already pruned bitcoin blockchain file from ...
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1answer
58 views

Why does bitcoin sync inventories?

I read the bitcoin docs describing how btc syncs. During IBD it gets the inventories up to the tip with getblock. Why does it not skip this step and get the blocks, generating the inventories as it ...
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1answer
62 views

How to download bitcoin blockchain without core?

I tried to download the entire blockchain using bitcoin-core but i took about 9 days and eventually gone corrupted and i had to delete and restart. Any source to download through torrent or regular ...
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2answers
51 views

What should I do to increase bitcoind sync speed?

My VPS has 2gb RAM and CPU core is 1 and 1 TB HDD storage. The sync speed is very slow. Currently it has about 700 MB free RAM. bitcoind is taking about 66% of the 2GB ram. Should I add 1GB more RAM ...
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1answer
63 views

After a sleeping client comes online again which technique it uses to find the last common ancestor in a blockchain?

I have a Bitcoin client running on my PC and I turn it off. When I turn it on again how does it find the last common block in the blockchain so that it knows which blocks it should obtain?
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1answer
40 views

Re-index/Re-download from specific height?

I seem to have discovered corrupt blocks on one of my nodes. The node is on all the time to keep up to sync and the rest of my nodes connect to it to retrieve block data when they need to sync. The ...
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1answer
60 views

How to speed up first sync bitcoind?

I am running bitcoind version 0.19.0.1 on different cloud providers and it gets very slow at some point. After 300k blocks, CPU drops from ~90% to 5% and network usage drops to a minimum. I've tried ...
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1answer
104 views

How does Bitcoin Core know the progress of blockchain without connecting to peers?

I restarted my Bitcoin Core node after a gap of about a day and when seeing the console log, I noticed that it calculated the progress of my blockchain even before connecting to peers. The log ...
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0answers
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IBD problem: Reindexing blocks and syncing starts over every time I shut and open Core

I am currently doing IBD in segments due to logistical reasons, but each time I safely shut down Core and unplug my hard drive (HDD, 1TB) and then plug it back in and start up Core, it starts in 2009 ...
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0answers
35 views

btc qt walletdump

I'd like to dump my entire btc qt wallet, while syncing, into an electrum wallet. I don't want to do it receiving address by receiving address. I already emptied out all my receiving addresses but ...
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btc qt syncing but taking to long/dumpwallet debug console problems

Would like to transfer my btc qt wallet to electrum but having difficulties. My node is currently syncing Tried emptying out receiving addresses and was successful but there are still more coins in ...
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32 views

Trouble dumping btc wallet

Btc is syncing and taking to long. Would like to dump wallet and sweep in electrum. When I try the dumpwallet command I get "Cannot open wallet dump file (code -8)" What to do? Do I have to stop ...
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2answers
67 views

how do you transfer your Bitcoin core wallet while syncing?

I would like to transfer my btc wallet to an electrum wallet. Syncing is taking to long.
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2answers
493 views

When will I receive bitcoins

Today I sent bitcoin to my bitcoin core wallet. I used an address under recieve bitcoins. The transaction has been cleared on the blockchain for several hours but is not showing up in my wallet. ...
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0answers
54 views

zmq pubhashblock / pubrawblock during initial block sync

I've recently noticed that block data is not published via zmq during the initial sync (but transaction data is). Is that something to be expected, or could it be a misconfiguration of my node (or ...
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2answers
212 views

Does rpcpassword need to be non-obvious in bitcoind?

I'm syncing a full BTC node onto an external hard drive, which I'm connecting to by USB. I've created a bitcoin.conf file which sets a very insecure rpcpassword. This is literally the only field I put ...
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0answers
25 views

What are the ways of receiving transactions list via Bitcoin address?

My team challenges an issue. Trying to support Bitcoin wallets in a messenger app and staying user-friendly, we need transaction lists to be receivable quick and nice. So users would not die waiting. ...
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1answer
29 views

bitcoin core problem payment

I downloading bitcoin core on my computer. But my computer is full, and downloading is not complete. I made transfer my bitcoin to URI on bitcoin core, which downloading. But nothing came and I didn't ...
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2answers
74 views

How does a node find the active chain?

Let's say a user joins the Bitcoin network and downloads the latest state of the blockchain (all blocks, which includes the forks/uncles). How does this user find/determine the active blockchain on ...
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1answer
106 views

How can I start bitcoind without blockchain synchronization?

Suppose I make a locked wallet with 50000 pre-generated addresses. As long as I researched, only way I can collect those 50000 addresses using RPC and "getnewaddress". Feel free to correct me. I ...
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1answer
31 views

Does bitcoin qt need to synch before I can spend my change?

Sorry for the follow up question... i was trying to transfer my btc to a new wallet (believing the original one had been compromised). I sent 2 tiny test transfers of $1 then when they arrived in the ...
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0answers
145 views

Bitcoin Core Blockchain Sync Fatal Internal Error - Corrupt Block - Linux

I'm trying to perform the IBD on Bitcoin Core 0.18 and I continually receive "Fatal Internal Error" at seemingly random intervals, closing bitcoin-qt and preventing me from fully syncing. Farthest I'...
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1answer
708 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
111 views

Bitcoin core crash during IBD

I've been running bitcoin core on an android device (nexus 5x) and emulator, and sync on testnet always fails at around 3% progress the last thing logged is “pre-allocating up to position 0x900000 ...
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1answer
107 views

how can I recover my private key from my passphrase and password

I decided recently to get some BTC and bitcoin core was the storage solution I decided on. I downloaded the software, and all seemed good. No messages about storage or such. Around a month later I ...
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1answer
124 views

My Bitcoin client has stopped syncing

As you can see my client is stuck on 99,7% with unknown. Syncing Headers(577895), It has been in this state since last day synced(which you can see). How can I get it to work since I have plenty of ...
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1answer
77 views

Bcoin initial blockchain sync progress isn't saved

I'm using bcoin and it's class FullNode to run a full Bitcoin Node. Here's the configuration: const node = new bcoin.FullNode({ prefix: '/mnt/d/bcoin', network: 'testnet', ...
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2answers
143 views

What happens if a miner receives a block but not its previous?

Suppose the following: A miner has stored the current blockchain A-B-C. It stops listening for blocks during some time. During that time, blocks D and E are mined and broadcasted. The miner ...
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0answers
46 views

Importing the keys Issue

I imported the private keys into my wallet and they appear to be added: This is the result when i run getImportedKeys(): [ECKey{pub HEX=...
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1answer
151 views

Why my bitcoind cannot query all the blocks?

I just install the bitcoind and run: bitcoind -daemon and when i tried to: bitcoin-cli getblockhash 195876 i got an message: error code: -8 error message: Block height out of range the command: ...
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0answers
42 views

Do SPV nodes sync “headers-first”?

Headers-first sync is defined somewhat by BIP 130 and expanded upon with compact block relay in BIP 152. I believe this is the commit in which it was added to Bitcoin Core. The result is that Bitcoin ...
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1answer
48 views

Can bitcoin core verify a third party blockchain download?

If you were to obtain a copy of the bitcoin blockchain, i.e. a copy of someone's data dir excluding his wallet files on a removable drive or other storage medium, could bitcoin core verify that or not?...
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2answers
343 views

Bitcoin Core frozen trying to sync and/or connecting to peers

I downloaded Bitcoin Core directly to my laptop and sent BTC to what i believe is my wallet. The BTC is no longer in my senders wallet and I do not see it in my bitcoin core wallet. It was working ...
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0answers
48 views

How to most efficiently keep in sync blockchain on offline computer (including through bitcoin-qt upgrades)?

I have bitcoin-qt running on online computer. I want to: copy blockchain to offline computer (preferably using WORM media for security reasons) from time to time update offline copy with newest ...
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2answers
84 views

What is the quickest way to bring a bitcoind node up handling 99% of edge cases?

Currently when syncing a bitcoind node from scratch the time of going from zero (0) to about 50% is a very fast process but somewhere between 50%-75% it slows down considerably and at 75%-85% it ...
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1answer
49 views

Do checkpoints affect initial chain sync time?

I've seen some guides that suggest that initial sync time for a new full node can be accelerated by setting checkpoints: false but I don't understand why that would be the case. My thinking is the ...
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1answer
111 views

Is backward syncing viable for full nodes?

Currently, Every Bitcoin Core full node has to download the whole blockchain at least once. This situation is even worse if pruning is enabled - the user has to download the whole gigantic blockchain ...
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3answers
194 views

Does a bitcoin node broadcast that it is full synced?

When a bitcoin core node is fully synced, does it broadcast to the rest of the network that is has finished syncing? If yes, where in the bitcoin-core source code is this implemented?
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1answer
82 views

How to see download sync speed when syncing the Bitcoin 0.17.1 Blockchain on Ubuntu 18?

I'm syncing the bitcoin 0.17.1 blockchain from the beginning on Ubuntu 18 using Bitcoin Core Qt gui client. Is there a way to see the download speed of the Bitcoin Blockchain and how much time I have ...
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2answers
98 views

How long does it take to update all nodes that have the blockchain so that they are identical?

Beginner questions... I understand that everybody has their own copy of the blockchain. If one person makes a change, for example a transaction, I assume that it has to propagate to all other nodes....
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1answer
61 views

Old Bit Coin Wallet Failing to Pass 180 Weeks

I have an old laptop that I have bitcoin wallet on. I left the computer alone since early 2015 and when I try to sync the bitcoin wallet, the wallet gets stuck on 180 weeks. the bitcoin wallet sync ...
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1answer
68 views

Does bitcoin validate transactions against the mempool?

I want to know whether or not bitcoin checks for the existence of transactions in the mempool as one of the many validation rules it performs for new blocks. If a transaction most exist in the ...
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3answers
345 views

How many nodes need to validate a newly created block?

It must be impossible for a newly created block to be propagated and validated by every node in bitcoin network considering offline nodes and the ones with poor Internet connectivity. How many ...
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1answer
366 views

Txindex=1: how to recognise the blockchain with this option?

This might be a dumb question: I started the Bitcoin daemon for an initial blockchain download. It immediately started downloading, I edited the Bitcoin.conf file with txindex=1. Stopped and restarted ...
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0answers
93 views

Bitcoind 0.5.3 stuck at block 364,670 - what to do?

I compiled bitcoind using the same steps as last year. In particular I set DB_CONFIG: set_lg_dir database set_lk_max_locks 537000 Unfortunately once I hit block 364,670 (2015-07-10) I'm treated with:...

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