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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8
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1answer
774 views

What are the trust assumptions in --assumed-valid in bitcoin core 0.14?

Please help me understand and distinguish the trust assumptions in the following three cases shown below. Specifically, please elaborate the attacks possible (even though completely theoretical) and ...
2
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1answer
657 views

synchronizing block headers

When I opened the bitcoin client, I found that it was "synchronizing block headers". Does this mean that the client first downloads block headers and then downloads block bodies? What kind of file ...
1
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1answer
530 views

Bitcoin block index synchronization

What is the work done by the bitcoin core client during the initialization process? Is the block index created locally or downloaded at other partner nodes?
1
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1answer
155 views

How does intial block download work at P2P layer?

A simple DOS attack while IBD could be as follows: The fresh client is currently downloading block 100. Then it is offered 10 blocks at height 101, each claiming they are the heaviest chain 9 out of ...
1
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3answers
700 views

DigitalNote Wallet Stuck on last node (415608)

I've downloaded the 1.0.12-beta (last) version of the XDN Wallet from the official website, got the address, transferred 70€-worth of XDN in it using Changelly. The transaction worked fine and I got ...
1
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3answers
83 views

Storage exceeded in middle of synch

A friend gave me a few bitcoins a number of years ago. Yesterday, I read an article about bitcoin and it reminded me I had some. I went online to check the value and to possibly spend them. I tried to ...
19
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5answers
27k views

Sync with bitcoin-qt very slow (0,01%)

I have the issue that my node's synchronisation is very slow. I am 14 weeks behind and it estimates to take 12 weeks to get synced. The synchronisation rate per hour is only 0,01%. I have a fast ...
0
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1answer
43 views

Why isn't the right chain chosen according to the number of nodes who are broadcasting it?

So if a new node join the game, it gets blockchain from other peers. It may actually receive 2 different chains and it chooses the longer cos of more work done. I wonder why isn't it simply choose ...
1
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0answers
389 views

Connecting to peers but not loading any blocks

I start Bitcoin Core as admin and last week everything worked as it should, but now it is stuck at 93% and tells me it is connecting to peers. In the end I waited 5 hours and it happend nothing. ...
1
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1answer
1k views

"Failed to connect best block" error when I try to load my wallet

Everytime I try to open my wallet this error comes up. I have shut the computer down a few times and removed the wallet and reloaded it a few times too and the error keeps happening. If you can'...
4
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1answer
344 views

Do unsynced Bitcoin ABC nodes send Bitcoin transactions instead of Bitcoin Cash transactions?

Bitcoin ABC is fully compatible to Bitcoin up to the fork. Does that mean that an unsynchronized Bitcoin ABC node sends Bitcoin transactions instead of Bitcoin Cash?
1
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1answer
82 views

Is the asymptotic performance of bitcoin O(n) relative to the block chain length?

If I want the latest information (ie. account balance) of account A do I have to traverse the entire block chain to get that info or is the relevant information store in the latest block or some other ...
1
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1answer
788 views

How many peers do you need to securely synchronize with the blockchain?

What is the minimum number of peers required to securely synchronize my local blockchain copy?
0
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1answer
259 views

Bitcoin core outgoing transactions

On The bitcoin core wallet you don't have to wait for it to sync to after your outgoing transaction in order for the transaction sent from the wallet to be confirmed and arrive at the addressee, does ...
0
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1answer
109 views

Transaction not showing up as confirmed on MultiBit

I tried to send a Bitcoin transfer yesterday at noon and after more than 120+ confirmations it's still unconfirmed. I used MultiBit as wallet, I set fees but still nothing. I was used to super-fast ...
1
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0answers
512 views

Blockchain download stuck on Bitcoin core wallet

The caching up process was progressing (slowly but still progressing) until it got stuck after processing 436820 blocks: http://i.imgur.com/4nbP3ML.png 3 days after, I'm still at 70.76% Says I'm ...
1
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1answer
183 views

Bitcoind 0.5.3 stuck at block 274,011

I compiled v0.5.3 of the core client from source, in order to compare IDB (Initial Blockchain Download) performance between versions. I created a fresh Ubuntu Xenial 16.04 machine on Amazon EC2. I ...
2
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1answer
1k views

Trying to sync a new node and keep getting hashMerkleRoot mismatch

I've tried syncing this same MacBook Pro multiple times and it keeps stalling. The debug.log file keeps repeating the same two lines at block 275162: 2017-07-07 03:09:59 ERROR: ConnectBlock: ...
2
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2answers
5k views

Unplugged Trezor when incoming transaction was unconfirmed

I transferred some bitcoins from one of my online wallet to my Trezor. When the transaction is in unconfirmed mode I unplugged my Trezor. Then after I plugin my Trezor that transaction somehow did not ...
2
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1answer
1k views

What will happen if a block is lost on a peer?

In the Bitcoin network, each peer maintains a full copy of the ledger (blockchain). What will happen if a peer losts one of its blocks in the blockchain (e.g. another process on the peer accidentally ...
0
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1answer
337 views

Bitcoind sync process

I accidentally deleted all the files that the standard bitcoin client stores to disk, except blk*.dat files. When I run bitcoind, he write that he doing sync. This sync is very very slow. What does ...
1
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1answer
415 views

Received coins in offline Armory wallet that had not yet been synced

I'm new to the Bitcoin world and I have an issue. I created a wallet in Armory but did not realize that it was offline and the db had not been spawned. I have no way of downloading the full armory ...
0
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0answers
102 views

bitcoin-qt does not add blocks anymore

I am trying to catch up/synchronize the blocks in my blockchain with bitcoin-qt. However, the last block time is stuck for hours at Feb 15 04:29:18 2017 since I started bitcoin-qt the last time. ...
1
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1answer
127 views

Is it possible that transactions throughput will grow to beyond what can be synchronized?

The number of users increases, and thus the number of transactions. Is it possible that in the future transactions arise faster than I can sync them?
-1
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1answer
61 views

I installed bitcoin core and it started synchronising, at 50 % it says that i dont have enough free disk space

How is it possible that i don't have enough free space? I checked beforehand and the client said i needed around 120GB but i have at least 290GB free space and now it says at 50% that my disk is full ...
1
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2answers
160 views

Bitcoin Core on a Linux partition on MacBook... Lost bitcoin due to insufficient disk space to update blocks

As the title says, I have an interesting difficulty and have no idea how to resolve it. I installed bitcoin core on the linux partition of my macbook, but was not aware that it needed as much disk ...
1
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1answer
265 views

Armory synchronization takes forever. How can I speed it up or retrieve my coins?

I have an Armory wallet that has been offline for a long time. When I start up that computer it runs just fine, however it is taking forever to download the blockchain. Based on my estimate of the ...
1
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1answer
143 views

do i need to fully download the blockchain before operating commands on litecoin daemon or dash daemon

I am setting up a website that needs to process commands like creating new addresses, do transactions even maintain wallet balance and get notifications on incoming transactions to address created. I ...
0
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2answers
3k views

Unable to connect to peers nor synchronize the network

Neither I'm able to connect to my peers nor I'm able to synchronize my bitcoin core in my network. When I connect my laptop to my mobile hotspot synchronizing works fine and progress in shown. Here ...
0
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2answers
3k views

How to Retrieve BTC without syncing wallet [duplicate]

I bought approximately 1 BTC is 2013. I deposited this BTC with a wallet, but I did not keep the wallet in sync. I recently opened the wallet and it says I have 0.0 BTC, and that I have approximately ...
2
votes
1answer
2k views

Connecting full nodes within a LAN to speed up blockchain sync

Bitcoin core v0.14.0 seems to be a lot quicker than previous versions, to the point where syncing the full blockchain now seems to be IO-bound rather than CPU-bound: When running top I used to see my ...
1
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1answer
45 views

How do I transfer btc from Core that never finishes syncho to another wallet? [duplicate]

My Core finished sychro after 4 months, the transaction was visible finally (then I moved all data from one file in the computer to another) and Core started synchro again with 3 yrs remaining. It ...
1
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0answers
81 views

Bitcoin Full Node Stalled - 13.2

A full node that I've had running for months just began to stall on a certain block. It seems to be refusing to update blocks beyond a certain timeframe. There are no processes spinning, network ...
1
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0answers
416 views

Bitcoins disappeared on import into Electrum

A few years ago I received some bitcoin in Bitcoin Core (~0.4 BTC). Then I transferred some to Kraken (~0.1 BTC) and a few weeks later transferred some back (~0.1 BTC). Then I backed up wallet.dat and ...
1
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1answer
909 views

block checksum mismatch?

While trying to sync I got a "block checksum mismatch" in my debug.log file. Here is the last 30 lines. You can see that it happily downloading block, then it gets a network unreachable, then it has a ...
1
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0answers
163 views

bitcoind reloads blockchain from scratch when it starts up?

I have had my bitcoind turned off for a couple of months and I just turned it on again (bitcoind -daemon), and it seems to be reloading the entire block chain from scratch. Shouldn't it be loading ...
0
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0answers
97 views

Bitcoin Core for Mac not syncing, can't access private key to export coins to other wallet

Wondering if you can help me guys, I'm new to using bitcoins and recently downloaded Bitcoin Core to my MacBook. I stupidly sent bitcoins to my wallet without realising i had to sync first, but it's ...
1
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1answer
127 views

Installed 2nd Bitcoin client and invalidated blockchain progress

over the last couple of days I synchronized the block chain on an old version of Bitcoin QT where I still had funds in my wallet. It started out 90 weeks behind, then over the course of 4 days updated ...
5
votes
1answer
367 views

Is -blocknotify triggered during catch-up?

My node is way behind and I noticed the -blocknoitfy action specified in bitcoin.conf is not being triggered. Which is OK for now, because the node has so much catching up to do, the script wouldn't ...
1
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1answer
224 views

Can a resynchronization be avoided when recovering a wallet in Bitcoin Core?

I have tried to restore my wallet by replacing wallet.dat with my file, but the issue is that Bitcoin Core started synchronizing from 8 years again. Can some one help me to avoid this because I ...
1
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1answer
329 views

How can I run bitcoin-cli with disabled syncing?

I have synced about 200.000 blocks and that's enough for my purposes. So I want to use bitcoincli, but when it runs with enabled syncing (by default), my computer works to slow. How can I disable ...
1
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1answer
160 views

How can I pick up the blockchain download where it left off on another computer using an EHD?

I started downloading the Bitcoin blockchain via my MacBook Pro onto my 1TB external hard drive. I want to use my iMac to finish the download. I plugged my EHD into my iMac and checked to blocks ...
1
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0answers
260 views

Bitcoin Core QT Fatal Error after moving block folder, can't retrieve Private Key

I have tried installing Bitcoin Core on my PC and without thinking, I went on and bought some coins (I was trying to be organized, so by the time the sync was done I would already have the coin). 90% ...
2
votes
0answers
440 views

Synchronisation stopped at one specific blockchain

I've successfully been using Bitcoin core for the past months, but since two weeks ago its synchronisation is always stopped at the exact same blockchain. 2 weeks later, sync is behind by 2 weeks. And ...
0
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3answers
3k views

How to sync litecoin blockchain (+ bootstrap) from the terminal?

I've installed Litecoin from the main page, so now I have few executable files, like litecoin-cli, litecoind, litecion-qt, ... I know, that the easiest way to sync blockchain is to run ./litecoin-qt ...
0
votes
1answer
207 views

Which cryptocurrencies are better suited to users with limited bandwidth?

I'd like to try my hand at cryptocurrencies, but have limited bandwidth. Which cryptocurrencies are best suited to users such as me? Why? Due to the high bandwidth costs, I expect cryptocurrencies to ...
3
votes
1answer
406 views

How does the node system understand which ledger is the latest before updating their own ledger?

I have two specific questions: How does a new user realizes which is the correct copy of the ledger to be used when initially updating(downloading) the ledger, and why is it that a user cannot ...
5
votes
3answers
18k views

Blockchain synchronization is painfully slow / Best way to download blockchain

I'm trying to setup my own Bitcoin node on Ubuntu 16.04.1 LTS. Right now, I've stuck with blockchain synchronization. I'm letting bitcoind to run every day for at least 10-12 hours while I work and ...
0
votes
1answer
503 views

Transactions before blockchain sync? [duplicate]

I withdrew some bitcoins from a site and the blockchain is not synced yet. It's taking too long for the sync (more than a day). The payment is still not in my wallet. Can I send payment to another ...
1
vote
1answer
186 views

Synchronizing with network [duplicate]

I transferred some bitcoin to my bitcoin core wallet, at the bottom it is still showing "Synchronizing with network" and my funds have not yet appeared. Did transferring funds to my wallet before this ...

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