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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154 views

Bitcoin node synchronization speed up [duplicate]

I'm running a docker image with a bitcoin node (version v0.16.3.0-g49e34e288) and it's taking more than week to synchronize, having only synchronized 54% of the blockchain. I'm running it with the "...
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189 views

It's October 2018. ./bitcoin-qt -reindex-chainstate takes forever. Is there a way to speed this up?

Current version: Bitcoin Core 0.16.3 I think I have a corrupted blockchain download as my VM box was shut down in the middle of syncing. Which is why I'm doing a -reindex-chainstate I have the ...
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1answer
8k views

My system is syncing headers, what does that mean?

My system got shut down while I was syncronising. Please help me, it's showing "Unknown. Syncing Headers" and estimated time is unknown. What is happening here?
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1answer
154 views

bitcoind syncing backwards

I recently upgraded an old bitcoind install (core 0.11) to 0.16.2. After starting it up, it seems that it's syncing backwards: going from higher block numbers to lower ones: 2018-09-12 06:35:20 ...
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1answer
49 views

How to get output linked to input in SPV node?

We're working on bitcoin SPV wallet. After setting bloom filter, we only get merkle blocks, and transactions that match the hashes we set plus some false positives. If a transaction is where we SEND ...
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2answers
581 views

Slow sync running Bitcon full node on Mac Mini OSX

It is Jul 2018, I need help after several attempts to sync a full node running on a Mac Mini. I have tried several times and Bitcoin-qt starts pretty well for the initial sync, downloading with ...
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1answer
67 views

While attempting to fetch a particular block my node just gets disconnected by peers?

A system at an office has its testnet node stuck at a particular block. The logs report "requesting block" over and over again for the same block and after each one reports "socket recv error" and ...
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2answers
363 views

Accidentally shutdown system while Bitcoin Core client was synchronizing [closed]

My computer was accidentally shutdown while Bitcoin Core was synchronizing and it is now giving the error fatal error please see error log. Please tell me what is the solution to this problem.
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1answer
157 views

How can I make Zap synchronize with the Bitcoin network?

I'm using the Mac operating system. I downloaded Lightning App and Zap from Github. The wallet can not be synchronized with the network, how can I synchronize it and can I do it without having to ...
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1answer
206 views

synchronizing after many years

Several years ago, without really understanding the mechanics relating to bitcoin, I believe I might have managed a bit of mining. The "Bitcoin-wallet" and other files, including my wallet.dat file ...
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1answer
217 views

Can I do transactions while Bitcoin Core is being synchronized? [closed]

How long does this process take? It is telling me 46 weeks left but its doing this for months. How do I speed of the synchronization? I downloaded it from their website. It is the latest version of ...
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1answer
201 views

How does headers-first prevent fill-disk attack?

Checkpoints prevented an attack where a node could mine many many low-difficulty blocks from an early point in the blockchain and serve those blocks to syncing nodes who would see their disks fill up. ...
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3answers
550 views

bitcoind sync time incredibly slow

I am currently running bitcoind v0.16.0.0 on my macbook (osx 10.12.6) and the initial sync time is really slow. I'm syncing at roughly 88 blocks per hour which would mean it would take another 2 ...
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208 views

Atlcoin: Peers don't sync after one creating new block [closed]

I have made an altcoin flowing these steps: 1. Generate genesis block and modify in source code genesis = CreateGenesisBlock(1525404232, 5226643, 0x1e0ffff0, 1, 50 * COIN); consensus....
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1answer
242 views

Downloaded and installed bitcoind--bandwidth usage gone through the roof

I downloaded the Bitcoin Core daemon on a Ubuntu 16.04 platform from the bitcoin PPA. sudo apt-get install software-properties-common sudo apt-add-repository ppa:bitcoin/bitcoin Press ENTER to ...
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1answer
393 views

How Do Peers Choose Which Peer To Trust?

So the way I understand how the blockchain works is that each new block uses the previous block's hash, which means if my block[100].hash != someone_elses_block[100].hash that means that either I ...
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2answers
214 views

Very hard to sync Core Client from scratch

Recently I started running a Core 15.1 node with the blockchain on an external hard drive, and found it very hard to fully sync the blockchain. The problem I keep running into is that (in about 90% of ...
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1answer
74 views

How to Sync Main Net together with Test3 Net

After I install the bitcoin core, it just sync the main net. Is there a way that I can also sync the test3 net for testing/developing purpose?
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1answer
69 views

Bitcoin Core reports progress only up to 0.999999

On older version - after full synchronization in debug log i see message progress=1.0 In new - only progress=0.999999, it`s normal or i have some problems with synchronization?
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1answer
2k views

I use Litecoin Core wallet on my PC and need to have it on laptop to take away on holiday

I am using Litecoin Core wallet on my PC, and I need daily access to it. I am travelling away from home at Easter and taking my laptop with me. I downloaded Litecoin Core Wallet to my laptop, but ...
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2answers
237 views

From where does a node download a copy of the ledger

From where does a node download the latest copy of ledger initially? Is this information stored in a 'central server'? Let's say a node is offline for a while, after coming back how will the node get ...
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2answers
57 views

Any attack vector for Proof of Witness?

When Alice wants to send Bob some coins all she has to do is sign a transfer of ownership with her private keys and publicize that announcement until Bob is happy with the number of witnesses. For ...
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1answer
871 views

Extremely slow syncing speed while starting bitcoin-qt on HDD [duplicate]

I'm sorry for adding dupelicate question (e.g. How to speed up initial block chain sync using SSD without wasting space?), but I observered a dramatical speed increase while using RAMDisk or some disk ...
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1answer
773 views

Block #338819 deemed invalid by v0.15.1

I am attempting to sync from scratch a full node (v0.15.1) on a linux machine (Linux Mint running Ubuntu precise 12.04.1 LTS). The sync grinds to a halt on block #338818. From examining debug.log I ...
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2answers
953 views

Active connections and sync-ing my wallet issues [duplicate]

I have been trying to sync my wallet with the network for around 3 months, and it is still only at 45.29%. Any ideas? I am using Bitcoin Core version v0.15.0.1 (64-bit). I have UPnP enabled, I am ...
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1answer
2k views

Bitcoin Core - Go back to a specific block?

I have a full node of Bitcoin Core wallet. I would like to know if it's possible to delete data after a certain block. For example Bitcoin is currently at block 504385. There was a fork around block ...
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1answer
197 views

Unbreakablecoin - Block Height Stopped Moving

I am running a full Unbreakablecoin (a Bitcoin clone) node. Blocks were being generated every few minutes or so, until about a week ago. Now, the block height has been stuck at 82666 for multiple ...
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1answer
555 views

Running out of disk space with Bitcoin Core

A year ago I purchased some bitcoins and it was sent to my address. I loaded up Bitcoin Core and installed it to my laptop HD, it ran out of space on the HD, mid blockchain sync. It has now been a ...
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0answers
6k views

How to recover corrupted Bitcoin-Core blockchain?

I recently experienced a I/O error resulting in data block corruption or index corruption cause bitcoin-qt wasn't quitting so I forced bitcoin core to shutdown without killin it properly. I checked ...
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1answer
60 views

What is the name of the procedure of downloading and checking the ledger for a new node?

When a new node connects for the first time to the Bitcoin network, it first needs to determine what is in the ledger, and what is not. As far as I understood, it does so by connecting to the Bitcoin ...
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1answer
283 views

Is there anything I can do to speed up the synchronization of litecoinj? [closed]

I am using litecoinj which is forked from bitcoinj but compared to bitcoinj, the wallet creation and block synching is slow when using litecoinj. So, I searched for a solution and found a post that ...
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0answers
105 views

Synchronizing blockchain data to external hard disk [duplicate]

I've been struggling to find an answer for this, but it seems like there is no solid, well-documented answer for this. How can I use mounted external drive for blockchain synchronization? I ...
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1answer
1k views

Altcoin (Litecoin fork) creation. No synchronisation

i m trying to create an altcoin from the current Litecoin master branch on github. Its Litecoin in the version of 0.15.1. By editing some parameter in chainparams.cpp i m able to create my genesis ...
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1answer
136 views

Transfer incoming funds from Bitcoin Core to another wallet before blockchain sync is completed

This is my situation: I have a Bitcoin-QT wallet on my Mac (Qt version 4.7.4.- yes I know its very old). only recently I've been working out how to operate and exchange bitcoins. well to cut a long ...
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3answers
1k views

How long should it take to synchronize with blockchain?

I expected to find the answer somewhere here, but I could not find it. I am using windows 10 and the bitcoin core wallet, with 2GB database cache. I have set the wallet to start on system boot, and I ...
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1answer
442 views

Migrate from Bitcoin Core Wallet to somewhere else before sync completed

I created a Bitcoin wallet yesterday using Bitcoin Core Wallet application and bought some bitcoin via buy.bitcoin.com to the address mentioned in File>Recieving Address in my Bitcoin Core Wallet. ...
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1answer
71 views

Security concerns when downloading the block chain from a 3rd party source?

It takes very long until bitcoin-core has downloaded the whole block chain. So I decided to download the block chain files via a bittorrent published by this website: http://www.getbitcoinblockchain....
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1answer
3k views

Bitcoind --reindex vs starting allover again

I setup a Bitcoin Daemon on a VM hosted on an OpenStack cloud. VM has 8 Cores and 32GB of Ram and 20GB of storage. I mounted a 1TB volume into the .Bitcoin/blocks folder. I started bitcoind and it ...
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2answers
2k views

Why is my Electron Cash not detecting any servers?

I am using Elecron Cash 2.9.4, and I opened the wallet by using the seed of my old (BTC) Electrum Wallet. I intended to get BCH.
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1answer
612 views

Exploring a local copy of the Bitcoin blockchain without running a full node?

I've been hitting the rate limit for API calls for different services and have decided that it would be easier to have a local copy of the blockchain and query that instead. See my previous question: ...
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1answer
160 views

How does BitPay detect unconfirmed transactions so quickly?

I understand that BitPay accepts unconfirmed transactions. My question is how they manage to find these so quickly?! In my limited experience, even an unconfirmed transaction doesn't appear on my ...
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1answer
232 views

bitcoind cannot keep up with the blockchain

My Bitcoin full node worked in the past, but some time ago, it stopped synchronizing properly. The blockcount increases but stays far behind the blockchain: % bitcoin-cli getblockcount ...
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2answers
265 views

Trouble syncing my QT bitcoin wallet 12 days already and 144 weeks to go

I have been syncing my QT 8.5 beta bitcoin wallet for 12days and it has 142 weeks to go there must be something wrong it started at 160 weeks. What can I do about it at this rate it my take 3 months ...
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2answers
829 views

Updating old BitCoin-QT Core client V0.7 - 2017 Approach?

I have an old "BitCoin-QT" Core client at version 'V0.7 2-beta' - that is far out of date re Synching. (That client says the program uses Qt version 4.8.4, incase that is useful too). It was a ‘Full ...
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1answer
385 views

How to access Blockchain remotely for statistics study?

I would like to write small paper supported by Blockchain stats. Could you tell me how to access blocks chain remotely via GUI to make a query ? Blockchain's size is 159GB as of today, so download is ...
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4answers
2k views

How to retrieve unspent outputs on mSigna

Due to an upgrade, I had to recreate my wallet (vault) file from scratch - a process that took over a week. During this time, I was able to spend one coin (sending it to blockchain.info) because I ...
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1answer
1k views

Re-insalling Bitcoin Core without re-downloading blockchain

I had Bitcoin qt installed on my C drive and I downloaded the blockchain onto an external hard drive. I recently had to re-image my C drive. What I want to do is reinstall the Bitcoin software on my C ...
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1answer
618 views

How do bitcoin nodes sync with the INV mechanism?

In When and how does bitcoin node sync itself? it is described that there are a number of ways for nodes to synchronize on the blockchain state. How does (legacy) INV mechanism works?
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1answer
2k views

When and how does bitcoin node sync itself?

When does bitcoin node sync itself? Do different types of sync in bitcoin exist (initial, periodic...)?
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1answer
626 views

Is it possible to use bitcoin core on Mac OS Sierra saving the data on the network drive?

I got Mac Book Pro 2015 with Mac OS Sierra 10.12.6 (16G29) and 3 TB WD MyCloud network drive. I need to run bitcoin core client saving the blockchain data on this network drive, located on my home ...

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