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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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2answers
23 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 ...
0
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0answers
21 views

How do i get a PoS coin to sync with nodes after Invalidateblock at a height?

I have forked a pivx clone using invalidateblock at certain block number 863781. Now i have made no changes to the code or protocol so i expect it to mint new coins starting from this height. i have ...
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1answer
27 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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1answer
33 views

how do i setup a node for my altcoin?

I just created a new altcoin based on foocoin or barcoin. But now i need my wallet be synchronized. There's some way to setup a node without any cost or low cost for my wallet? By other part, i just ...
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1answer
30 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
44 views

Can I do transactions while Bitcoin Core is being synchronized?

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 ...
2
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1answer
63 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
72 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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0answers
24 views

bitpay/bitcore v8.0.0 sync time

New version of bitcore https://github.com/bitpay/bitcore/tree/v8.0.0 How much time does the synchronization process take on Bitcoin mainnet for bitpay/bitcore v8.0.0?
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0answers
51 views

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

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....
1
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1answer
95 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 ...
2
votes
1answer
61 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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1answer
50 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
35 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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0answers
30 views

Is it possible to bootstrap from bootstrap.dat in recent bitcoin-qt?

I read, that recent bitcoin-qt versions are doing headers-first sync: https://bitcoin.org/en/glossary/headers-first-sync as opposed to blocks-first sync. As a result, when trying to bootstrap ...
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0answers
23 views

Network usage when mining

I'm interested in how active a user is on the network when they're mining for new bitcoin via a full node (not internet based pool or something). I know there's an initial syncing period to catch up ...
1
vote
1answer
45 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?
1
vote
1answer
47 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 ...
1
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2answers
69 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 ...
-2
votes
2answers
50 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 ...
0
votes
1answer
169 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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0answers
241 views

Bitcoin clone, node won't sync in main chain

I create a clone of bitcoin change some setting like port, and run a network of 4 nodes by docker to test and learn. When I run it using -regtest, every things goes well I can generate blocks and node ...
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1answer
78 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
245 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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0answers
22 views

Older Bitcoin QT 0.10.0 balance total changes while synchronizing

First, I think I dont have a clue what im doing. Maybe you can help me. In 2015 I downloaded Bitcoin qt 0.10.0 to do some small payments with. I never used it again. When I opened it this week for fun ...
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0answers
10 views

Where's the downloaded file

ive been downloading this file (block?) for days. it has used all the space on my imac and is only 60% finished. clearly i cannot continue and need to reclaim the space lost. where is this file being ...
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1answer
111 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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0answers
55 views

Can't download the whole blockchain first time and already sent bitcoin amount to that wallet

I can't download the whole blockchain wallet to my PC first time. Already sent bitcoin amount to that wallet and it looks like I lost them, WTF? In the middle of downloading came this one: "Error: ...
0
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1answer
196 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
1k 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 ...
2
votes
1answer
52 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 ...
1
vote
1answer
183 views

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

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
41 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 ...
2
votes
1answer
995 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 ...
0
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1answer
2k views

How long does it take to Sync my Litecoin Core Wallet?

I transferred litecoin from Coinbase to my LTC Wallet. I downloaded the wallet from Litecoin.org and it says it has to sync first before it can accept the transfer. Currently, it says that it is about ...
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0answers
67 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 ...
1
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1answer
151 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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0answers
125 views

Old wallet unconfirmed from 2013

Anybody know what this means? Just restored it, its been synced for only 10 min but when I mouse over it just says unconfirmed. Do I wait or is something else going on?
2
votes
1answer
678 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
1k 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
347 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: ...
0
votes
1answer
126 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 ...
0
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1answer
118 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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0answers
581 views

Interpret debug log

Bitcoin Core has stopped working and this is the debug log, can anyone tell me how to move forward to get the blockchain downloading and BC telling me how many BTC I have? 2017-10-31 16:34:03 Bitcoin ...
1
vote
2answers
192 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 ...
2
votes
2answers
535 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 ...
1
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1answer
222 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
669 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 ...
2
votes
1answer
319 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 ...
1
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1answer
394 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?