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Bitcoin Core Reindexing Blocks On Disk

Bitcoin Core 0.11 (ch 2): Data Storage

Bitcoin Core 0.11 (ch 2): Data Storage

This page describes how & where Bitcoin Core stores blockchain data. There are basically four pieces of data that are maintained: blocks/blk*.dat: the actual Bitcoin blocks, in network format, dumped in raw on disk. They are only needed for rescanning missing transactions in a wallet, reorganizing to a different part of the chain, and serving the block data to other nodes that are synchronizing. blocks/index/*: this is a LevelDB database that contains metadata about all known blocks, and where to find them on disk. Without this, finding a block would be very slow. chainstate/*: this is a LevelDB database with a compact representation of all currently unspent transaction outputs and some metadata about the transactions they are from. The data here is necessary for validating new incoming blocks and transactions. It can theoretically be rebuilt from the block data (see the -reindex command line option), but this takes a rather long time. Without it, you could still theoretically do validation indeed, but it would mean a full scan through the blocks (7 GB as of may 2013) for every output being spent. blocks/rev*.dat: these contain "undo" data. You can see blocks as 'patches' to the chain state (they consume some unspent outputs, and produce new ones), and see the undo data as reverse patches. They are necessary for rolling back the chainstate, which is necessary in case of reorganisations. Note that the LevelDB's are redundant in the sense that they can be rebuilt from the block data. But validation and other operations would become intolerably slow without them. Block files store the raw blocks as they were received over the network. Block files are about 128 MB, allocated in 16 MB chunks to prevent excessive fragmentation. As of October 2015, the block chain is stored i Continue reading >>

What Does -rescan, -reindex Command Do & How To Rescan / Reindex Wallet?

What Does -rescan, -reindex Command Do & How To Rescan / Reindex Wallet?

Facebook Twitter Google+ LinkedIn Pinterest Reddit Are you getting any error when starting your core wallet ? Or is your local blockchain database broken / corrupt? This can occur when copying blockchain from one computer to another , when you update wallet incorrectly, or when you shutdown your wallet non-gracefully. Keep restarting application doesnt help here as it simply gets stuck at wallet loading page or overview screen and it wont show any further progress. There are also other scenarios in which your cryptocurrency wallet does not display your balance correctly. All these common errors can be fixed safely by manually repairing your wallet. Core wallet is quite sensitive and two commands which is used to fix a large number of wallet related issues are -rescan and -reindex. Whenever your wallet is not syncing or if your balance is not properly shown or whether your wallet is stuck at wrong chain. Youll be advised to reindex or rescan blockchain files. Beginners often tend to confuse these commands as they both sound similar. Also there are few who reindex and rescan every single time they open their wallet which is not necessary. Here in this beginners guide well show you how to reindex or rescan your core wallet. But before that lets first see what does rescan and reindex command do. So that you know when to use these commands? What and when to use Re-scan and Re-index command? Rescan (-rescan) This command re-scans your blockchain files for missing wallet transactions. So when does your wallet fails to store the transaction data? 1. When you restore wallet backup and 2. When you import a new private key to your wallet. The wallet client stores all transaction data of the addresses that it manages. However when you restore a new private key the wallet client do Continue reading >>

Bitcoin Qt Reindex Mac Hardware

Bitcoin Qt Reindex Mac Hardware

This is a new major version release, including new features, various bugfixes and performance improvements, as well as updated translations. If you are running an older version, shut it down. The first time you run version 0. Hence, a downgrade from version 0. Note that the block database format also changed in version 0. Upgrading directly from 0. However, as usual, old wallet versions are still supported. The chainstate database for this release is not compatible with previous releases, so if you run 0. If your node has pruning enabled, this will entail re-downloading and processing the entire blockchain. Bitcoin Core mac extensively tested on multiple operating systems using the Linux kernel, macOS Windows XP is not supported. Bitcoin Core should also work on most other Unix-like systems but is not frequently tested on them. After upgrade to 0. This is a minimal patch hardware avoid this issue from occuring. Only use this RPC if you know what you are doing. More complete wallet support for segregated witness is coming in a next version. As in previous versions, when using an encrypted HD wallet, the bitcoin cannot be topped up without unlocking the wallet. This means that currently, in order to recover from a backup of an encrypted HD wallet, the user must unlock the wallet with a really long hardware and manually trigger a rescan, otherwise they risk missing some keys when auto-topup cannot run. During the conversion from the previous format a few extra gigabytes may be used. Fee estimation has been significantly improved in version 0. The wallets are completely separated, reindex individual balances, keys and received transactions. Multi-wallet is enabled by using more than one -wallet argument when starting Bitcoin, either on the command line bitcoin in the Bitco Continue reading >>

Reindexing Blocks On Disk Bitcoin Load Faster

Reindexing Blocks On Disk Bitcoin Load Faster

Reindexing blocks on disk bitcoin load faster Genesis Mining Worth It - Bitcoin How Many Blocks Follow reddit's content policy. No promotion of adult content allowed. Spammy, unsolicited and sneaky referrals may be removed without notice. If you need an exception from a rule for a specific reason send a message to the mods to discuss. What does "reindexing blocks on disk" mean? So, I turned on my laptop and go click on Dogecoin Core, I got a message about an error loading up the block database and I selected the first option which was "ok". When Dogecoin Core finally loads up, guess what, it's back at 2 years and 3 weeks behind. Seeing how if that haven't had happened today would've been the 4th and final day of Dogecoin Core syncing. So, what does ""reindexing blocks on disk" exactly mean? Oh, that makes sense! This was happenng with my other cryptocurrency wallets as well. And I was noticing it was much faster then before. Okay, but how come it had to do it again? It said something about a "Corrupted database". If it blows up the same way again, your best option would be to blow away the blockchain and redownload it from scratch. Thanks, although I would like to avoid redownloading if at all possible; it took about 48 hours the first time. Oh, I wasn't running the reindex all the time. It probably took about 10 hours total, just when my computer was open. The way the blockchain is stored on your computer has changed with the latest version. The developers tweaked it, so that future users can profit from a faster init-proccess. The new indexing made it necessary to reinitialize your blockchain. Gundon 1 2 7. I don't think so. It wasn't until I deleted everything including the peers. Macbook just crashed trying to sync the blockchain for the first time from Bitcoin QT. Continue reading >>

Virtual Mining Bitcoin News Bitcoin-qt Wallet Crashes Twice A Month, Database Corrupted

Virtual Mining Bitcoin News Bitcoin-qt Wallet Crashes Twice A Month, Database Corrupted

Browse: Home Mainstream Bitcoin bitcoin-qt wallet crashes twice a month, database corrupted bitcoin-qt wallet crashes twice a month, database corrupted Published by on November 17, 2016 | Comments Off on bitcoin-qt wallet crashes twice a month, database corrupted ive been having these issues for almost a year, but now it is far more frequent. before version 0.13.0 happened maybe once every two months, now its twice a month. i use bitcoin to work, i need the wallet operational, every time it dies, it means that i cannot use it for nearly 30 hours until the reindex, rescan finishes!, what is it, the same issue happened with 0.12.0, then 0.13.0 , now with 0.13.1. 2016-11-16 01:29:48 Corruption: block checksum mismatch 2016-11-16 01:29:48 *** System error while flushing: Database corrupted 2016-11-16 01:29:57 ERROR: ProcessNewBlock: ActivateBestChain failed 2016-11-16 01:29:57 tor: Thread interrupt 2016-11-16 01:29:57 torcontrol thread exit 2016-11-16 01:29:57 msghand thread interrupt 2016-11-16 01:29:57 addcon thread interrupt 2016-11-16 01:29:57 scheduler thread interrupt 2016-11-16 01:29:59 opencon thread interrupt 2016-11-16 01:29:59 Shutdown: In progress 2016-11-16 01:29:59 Corruption: block checksum mismatch 2016-11-16 01:29:59 *** System error while flushing: Database corrupted i dont understand why it gets corrupted, my computer works fantastically fine, i have zero problems, i am an IT, i dont use antivirus, i can detect a virus a mile away and remove it without any tool. i do all kind of heavy work on this machine all the time and never have one single problem, except for the bitcoin wallet that gets corrupted all the time. AMD APU A8-7600 on gigabyte F2A88X, 16GB DDR3 1866 kingston black, SSD (boot/bitcoin wallet) Samsung 840 Pro, win 7 64bit. any idea of what c Continue reading >>

Whats New In Bitcoin Core V0.15part1

Whats New In Bitcoin Core V0.15part1

I work on open source Bitcoin projects at @Chaincodelabs in NYC. Whats new in Bitcoin Core v0.15 part1 Im very excited about the recent Bitcoin Core v0.15 release . This is the first major release that Ive been involved in from start to finish, and there are some great new features and improvements. Over the next few days, Ill present a series of articles highlighting five of the most interesting changes to look out for. Im going to dive quite deep into the technical details of these changes since I think theyre all interesting and instructive. If youre not interested in those details and just want a high-level overview of whats new, then the release notes are a better place to look. Well start by getting under the hood and look at an implementation change. Users shouldnt see any changes in behaviour from this change, except for their Bitcoin Core client performing much better. Per-output chainstate db is a fantastic win in Initial Block Download time and general performance, as well as being a huge improvement in code simplicity. It also removes a potential DOS vector where an attacker could exhaust a nodes memory with carefully constructed transactions. Users shouldnt see any functional difference, but it gives such a performance improvement that its worth looking at in more detail. First, a bit of blockchain theory and history. The blockchain is simply an ordered log of the transactions that have been accepted by the network up to certain time. Once the blocks have been validated, that blockchain data is no longer useful to the node. What were actually interested in is the UTXO set the set of all transaction outputs that have not yet been spent. All full nodes must keep a copy of this set so they can verify that transactions are spending coins that actually exist an Continue reading >>

Can't Synchronize - Technical Support - The New Litecointalk Forum

Can't Synchronize - Technical Support - The New Litecointalk Forum

you are out of drive space or you need more ram but more than likely too low on drive space not enough virtual ram available to load chain data is another possibility as well I dealt with this about 2 years ago with bitcoin Thank you for your reply. My PC has 70GB available Disk space , so I will check the memory free space of my mac PC. its gotta be the RAM then Id recommend at least 4GB even though the website says you need at least 2looks like you indexed fine but the software cant remember where its suppose to find the data to syc the chainso you have the chain downloaded just not synceddefinitely RAM I changed the RAM of my pc from 2G to 8G but the problem is still continued yeahits not in the older versionsdownload the newest version of corethats the one and only problem guaranteedusing old software that islitecoin.org and click download for your systemit will use your existing chain data and doesnt need to download blockchain againI bet once you download it will sync right up no problem Ill update to ver 0.10.4. I cant update to the newest ver because of my Mac OS version. Where can I download the 0.10.4? I cant find it you can download form source and compile it and install it with your system dependencies from and when you start it make sure to start it with the -upgradewallet which will upgrade you to the latest format ormaybe you can try starting your old wallet version with that flag tooin windows I would open command prompt and type litecoin.exe -upgradewallet and in Linux ./litecoin-qt -upgradewalletI dont use macs so your on your own theresorryhope this helps Ive registered github but I havent still got litecoin ver 0.10.4 for macOShow can I get it?? Sorry I stayed in Kenya last week and i left my PC in Japannow Im in Japan you need to build from source Continue reading >>

Bitcoin-qt: Reindexing Blocks On Disk : Bitcoin

Bitcoin-qt: Reindexing Blocks On Disk : Bitcoin

Do not use URL shortening services: always submit the real link. Begging/asking for bitcoins is absolutely not allowed, no matter how badly you need the bitcoins. Only requests for donations to large, recognized charities are allowed, and only if there is good reason to believe that the person accepting bitcoins on behalf of the charity is trustworthy. News articles that do not contain the word "Bitcoin" are usually off-topic. This subreddit is not about general financial news. Submissions that are mostly about some other cryptocurrency belong elsewhere. For example, /r/CryptoCurrency is a good place to discuss all cryptocurrencies. Promotion of client software which attempts to alter the Bitcoin protocol without overwhelming consensus is not permitted. Trades should usually not be advertised here. For example, submissions like "Buying 100 BTC" or "Selling my computer for bitcoins" do not belong here. /r/Bitcoin is primarily for news and discussion. Please avoid repetition /r/bitcoin is a subreddit devoted to new information and discussion about Bitcoin and its ecosystem. New merchants are welcome to announce their services for Bitcoin, but after those have been announced they are no longer news and should not be re-posted. Aside from new merchant announcements, those interested in advertising to our audience should consider Reddit's self-serve advertising system . Do not post your Bitcoin address unless someone explicitly asks you to. Be aware that Twitter, etc. is full of impersonation. Continue reading >>

Bitcoin Is Using +90% Cpu Power Using Ubuntu 12.04?

Bitcoin Is Using +90% Cpu Power Using Ubuntu 12.04?

I am using Ubuntu 12.04 and Bitcoin client v0.8.6.0-g03a7d67-beta and Qt version 4.8.1 as the GUI. My CPU is heating up and is automaticly shutting down after 30 minutes and sometimes after many hours. This is occurring both while synchronising with the block-chain or while reindexing the blocks on disk. After the CPU overheating my laptop (Dell Inspiron R15) switches off and has corrupted my sync. Other users have mentioned to start by typing in terminal bitcoin-qt -reindex. At the the end of the index around week17 my CPU overheats again. Reading around I found topics about switching off the "generate bitcoin" option inside the bitcoin.conf file but on my Ubuntu (including hidden files) I can not find that file. Any tips or help on this overheating issue? I have also posted this on bitcoin Stackexchange . The configuration file should be in a hidden file in your home directory - press Ctrl + H in file browser - inside ~/.bitcoin - there is a manual page here - at a guess, it says to use the gen option : gen=['0'|'1'] Enable or disable attempt to generate bitcoins Wilf Dec 14 '13 at 15:55 @Wilf I did check the hidden files but I still can not see it. In case I have to create it myself using for example gedit. Do I just insert and save the following line in my newly created bitcoin.conf file?: gen=[0] Jonathan Rogiest Dec 14 '13 at 16:11 Just run mkdir ~/bitcoin and echo 'gen=[0]' > ~/bitcoin/bitcoin.conf to make the config file. I do recommend @Adrian 's answer, but you could check the temperature and the critical temperatures in lm-sensors as well. Wilf Dec 14 '13 at 16:34 Because your issue is CPU related, your computer is likely to shutdown anytime you have excessive processor usage (not just bitcoin). There is a script called temp_throttle that you can use to limi Continue reading >>

Data Directory - Bitcoin Wiki

Data Directory - Bitcoin Wiki

The data directory is the location where Bitcoin's data files are stored, including the wallet data file. Go to Start -> Run (or press WinKey+R) and run this: Bitcoin's data folder will open. For most users, this is the following locations: C:\Documents and Settings\YourUserName\Application data\Bitcoin (XP)C:\Users\YourUserName\Appdata\Roaming\Bitcoin (Vista and 7) "AppData" and "Application data" are hidden by default. You can also store Bitcoin data files in any other drive or folder. If you have already downloaded the data then you will have to move the data to the new folder.If you want to store them in D:\BitcoinData then click on "Properties" of a shortcut to bitcoin-qt.exe andadd -datadir=D:\BitcoinData at the end as an example: "C:\Program Files (x86)\Bitcoin\bitcoin-qt.exe" -datadir=d:\BitcoinData Start Bitcoin, now you will see all the files are created in the new data directory. By default Bitcoin will put its data here: You need to do a "ls -a" to see directories that start with a dot. If that's not it, you can do a search like this: find / -name wallet.dat -print 2>/dev/null By default Bitcoin will put its data here: Bitcoin's verbose log file. Automatically trimmed from time to time. Storage for keys, transactions, metadata, and options. Please be sure to make backups of this file. It contains the keys necessary for spending your bitcoins. Storage for ip addresses to make a reconnect easier Storage for peer information to make a reconnect easier. This file uses a bitcoin-specific file format, unrelated to any database system [1] . fee_estimates.dat [Versions v0.10.0 and later] Statistics used to estimate fees and priorities. Saved just before program shutdown, and read in at startup. The data, index and log files are used by Oracle Berkeley DB , the embe Continue reading >>

Bitcoin Core Version 0.13.0 Released 23 August 2016

Bitcoin Core Version 0.13.0 Released 23 August 2016

This is a new major version release, including new features, various bugfixesand performance improvements, as well as updated translations. Please report bugs using the issue tracker at github: Microsoft ended support for Windows XP on April 8th, 2014 ,an OS initially released in 2001. This means that not even critical securityupdates will be released anymore. Without security updates, using a bitcoinwallet on a XP machine is irresponsible at least. In addition to that, with 0.12.x there have been varied reports of Bitcoin Corerandomly crashing on Windows XP. It is not clear what the source of these crashes is, but it is likely that upstreamlibraries such as Qt are no longer being tested on XP. We do not have time nor resources to provide support for an OS that isend-of-life. From 0.13.0 on, Windows XP is no longer supported. Users aresuggested to upgrade to a newer verion of Windows, or install an alternative OSthat is supported. No attempt is made to prevent installing or running the software on Windows XP,you can still do so at your own risk, but do not expect it to work: do notreport issues about Windows XP to the issue tracker. As a result of growth of the UTXO set, performance with the prior defaultdatabase cache of 100 MiB has suffered.For this reason the default was changed to 300 MiB in this release. For nodes on low-memory systems, the database cache can be changed back to100 MiB (or to another value) by either: Changing it in the GUI under Options Size of database cache Note that the database cache setting has the most performance impactduring initial sync of a node, and when catching up after downtime. The RPC command line client gained a new argument, -stdinto read extra arguments from standard input, one per line until EOF/Ctrl-D.For example: $ src/bitcoi Continue reading >>

Data Directory. All About Cryptocurrency - Bitcoin Wiki

Data Directory. All About Cryptocurrency - Bitcoin Wiki

Go to Start -> Run (or press WinKey+R) and run this: Bitcoin's data folder will open. For most users, this is the following locations: C:\Documents and Settings\YourUserName\Application data\Bitcoin (XP)C:\Users\YourUserName\Appdata\Roaming\Bitcoin (Vista and 7) "AppData" and "Application data" are hidden by default. You can also store Bitcoin data files in any other drive or folder. If you have already downloaded the data then you will have to move the data to the new folder.If you want to store them in D:\BitcoinData then click on "Properties" of a shortcut to bitcoin-qt.exe andadd -datadir=D:\BitcoinData at the end as an example: "C:\Program Files (x86)\Bitcoin\bitcoin-qt.exe" -datadir=d:\BitcoinData Start Bitcoin, now you will see all the files are created in the new data directory. By default Bitcoin will put its data here: You need to do a "ls -a" to see directories that start with a dot. If that's not it, you can do a search like this: find / -name wallet.dat -print 2>/dev/null By default Bitcoin will put its data here: Bitcoin's verbose log file. Automatically trimmed from time to time. Storage for keys, transactions, metadata, and options. Please be sure to make backups of this file. It contains the keys necessary for spending your bitcoins. Storage for ip addresses to make a reconnect easier Storage for peer information to make a reconnect easier. This file uses a bitcoin-specific file format, unrelated to any database system [1] . fee_estimates.dat [Versions v0.10.0 and later] Statistics used to estimate fees and priorities. Saved just before program shutdown, and read in at startup. The data, index and log files are used by Oracle Berkeley DB , the embedded key/value data store that Bitcoin uses. [v0.8 and above] Contains blockchain data. Stored are actual Continue reading >>

Bitcoin Core 0.11 (ch 2): Data Storage

Bitcoin Core 0.11 (ch 2): Data Storage

This page describes how & where Bitcoin Core stores blockchain data. There are basically four pieces of data that are maintained: blocks/blk*.dat: the actual Bitcoin blocks, in network format, dumped in raw on disk. They are only needed for rescanning missing transactions in a wallet, reorganizing to a different part of the chain, and serving the block data to other nodes that are synchronizing. blocks/index/*: this is a LevelDB database that contains metadata about all known blocks, and where to find them on disk. Without this, finding a block would be very slow. chainstate/*: this is a LevelDB database with a compact representation of all currently unspent transaction outputs and some metadata about the transactions they are from. The data here is necessary for validating new incoming blocks and transactions. It can theoretically be rebuilt from the block data (see the -reindex command line option), but this takes a rather long time. Without it, you could still theoretically do validation indeed, but it would mean a full scan through the blocks (7 GB as of may 2013) for every output being spent. blocks/rev*.dat: these contain "undo" data. You can see blocks as 'patches' to the chain state (they consume some unspent outputs, and produce new ones), and see the undo data as reverse patches. They are necessary for rolling back the chainstate, which is necessary in case of reorganisations. Note that the LevelDB's are redundant in the sense that they can be rebuilt from the block data. But validation and other operations would become intolerably slow without them. Block files store the raw blocks as they were received over the network. Block files are about 128 MB, allocated in 16 MB chunks to prevent excessive fragmentation. As of October 2015, the block chain is stored i Continue reading >>

[bitcoin-core-dev] Bitcoin Core 0.13.0 Released

[bitcoin-core-dev] Bitcoin Core 0.13.0 Released

[bitcoin-core-dev] Bitcoin Core 0.13.0 released Wladimir J. van der Laan laanwj at gmail.com Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] -----BEGIN PGP SIGNED MESSAGE-----Hash: SHA512Bitcoin Core version 0.13.0 is now available from: < >Or through bittorrent: magnet:?xt=urn:btih:35367ed2db6c41f7af9c1ed2dd54ae29d99bc632&dn=bitcoin-core-0.13.0&tr=udp%3A%2F%2Ftracker.openbittorrent.com%3A80%2Fannounce&tr=udp%3A%2F%2Ftracker.publicbt.com%3A80%2Fannounce&tr=udp%3A%2F%2Ftracker.ccc.de%3A80%2Fannounce&tr=udp%3A%2F%2Ftracker.coppersurfer.tk%3A6969&tr=udp%3A%2F%2Ftracker.leechers-paradise.org%3A6969&ws=https%3A%2F%2Fbitcoin.org%2Fbin%2FThis is a new major version release, including new features, various bugfixesand performance improvements, as well as updated translations.Please report bugs using the issue tracker at github: < >To receive security and update notifications, please subscribe to: < >Compatibility==============Microsoft ended support for Windows XP on [April 8th, 2014]( ),an OS initially released in 2001. This means that not even critical securityupdates will be released anymore. Without security updates, using a bitcoinwallet on a XP machine is irresponsible at least.In addition to that, with 0.12.x there have been varied reports of Bitcoin Corerandomly crashing on Windows XP. It is [not clear]( )what the source of these crashes is, but it is likely that upstreamlibraries such as Qt are no longer being tested on XP.We do not have time nor resources to provide support for an OS that isend-of-life. From 0.13.0 on, Windows XP is no longer supported. Users aresuggested to upgrade to a newer verion of Windows, or install an alternative OSthat is supported.No attempt is made to prevent installing or running the software on Windows XP,you can still do Continue reading >>

Reindexing Blocks On Disk

Reindexing Blocks On Disk

I want to move my wallet to Electrum, I'm tired of Bitcoin Core. It's too slow. Is it possible to do that without waiting for the reindex to be finished? Start Bitcoin Core. Go to Help > Debug Window > Console. In the text box at the bottom type Where is the address which you want the private key of. The output should be in black and be a single string that starts with a 5, K, or L. This is your private key. DO NOT SHARE YOUR PRIVATE KEY WITH ANYONE. ANYONE WHO HAS YOUR PRIVATE KEYS WILL BE ABLE TO SPEND YOUR BITCOIN. Then start Electrum. You can either import your private keys or sweep them. Importing means you will still use the same addresses, sweeping will simply move all of the Bitcoin to an address in the Electrum wallet. I recommend you sweep. To sweep, create a new normal Electrum wallet. Make sure you record the wallet seed. Then when the wallet is made, go to Wallet > Private Keys > Sweep. Enter all of your private keys, one on each line, and the wallet will automatically sweep the Bitcoin into your wallet. To import the private keys, go to create a new wallet but instead choose "restore a wallet or import keys". Click next. In the box, enter your private keys, one on each line. Follow the rest of the instructions and you will have created a new Electrum wallet with your keys imported. I want to move my wallet to Electrum, I'm tired of Bitcoin Core. It's too slow. Is it possible to do that without waiting for the reindex to be finished? Start Bitcoin Core. Go to Help > Debug Window > Console. In the text box at the bottom type Where is the address which you want the private key of. The output should be in black and be a single string that starts with a 5, K, or L. This is your private key. DO NOT SHARE YOUR PRIVATE KEY WITH ANYONE. ANYONE WHO HAS YOUR PRIVATE Continue reading >>

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