How to Upgrade

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This is a new minor version release, including various bugfixes and performance improvements, as well as updated translations.

If you are running an older version, shut it bitcoin qt copy blockchain login. 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 is 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. A number of changes to the way Bitcoin Core deals with peer connections and invalid blocks have been made, as a safety precaution against blockchain forks and misbehaving peers.

Unrequested blocks with less work than the minimum-chain-work are now no longer processed even if they have more work than the tip a potential issue during IBD where the tip may have low-work. This prevents peers wasting the resources of a node. Peers which provide a chain with less work than the minimum-chain-work during IBD will now be disconnected. For a given outbound peer, we now check whether their best known block has at least as much work as our tip.

If after two minutes their best known block has insufficient work, we disconnect that peer. We protect 4 of our outbound peers from being bitcoin qt copy blockchain login by this logic to prevent excessive network topology changes as a result of this algorithm, while still ensuring that we have a reasonable number of nodes not known to be on bogus chains.

Outbound non-manual peers that serve us block headers that are already known to be invalid other than compact block announcements, because BIP explicitly permits nodes to relay compact blocks before fully validating them will now be disconnected.

If the chain tip has not been advanced for over 30 minutes, we now assume the tip may be stale and will try to connect to an additional outbound peer. A periodic check ensures that if this extra peer connection is in use, we will disconnect the peer that least recently announced a new block. The set of all known invalid-themselves blocks i.

This ensures that everything that descends from an invalid block is marked as such. Bitcoin qt copy blockchain login blockmaxweight has been preferred for limiting the size of blocks returned by getblocktemplate since 0. Using this option resulted in a few UI issues as well as non-optimal fee selection and ever-so-slightly worse performance, and has thus now been deprecated.

Further, the blockmaxsize option is now used only to calculate an implied blockmaxweight, instead of limiting block size directly. Any miners who wish to limit their bitcoin qt copy blockchain login by size, instead of by weight, will have to do so manually by removing transactions from their block template directly. The GUI settings will now be written to guisettings. This can be used to retroactively troubleshoot issues due to the GUI settings. Previously, it was possible to open the same wallet twice by manually copying the wallet file, causing issues when both were opened simultaneously.

It is no longer possible to open copies of the same wallet. A hidden debug argument -minimumchainwork has been added to allow a custom minimum work value to bitcoin qt copy blockchain login used when validating a chain.

This is a security measure as well as bitcoin qt copy blockchain login dangerous user mistakes. The behaviour is unchanged when an empty string is provided. As well as everyone that helped translating on Transifex. Bitcoin Core version 0. Please report bugs using the issue tracker at GitHub: Downgrading warning The chainstate database for this release is not compatible with previous releases, so if you run 0. Compatibility Bitcoin Core is extensively tested on multiple operating systems using the Linux kernel, macOS Notable changes Network fork safety enhancements A number of changes to the way Bitcoin Core deals with peer connections and invalid blocks have been made, as a safety precaution against blockchain forks and misbehaving peers.

Miner block size limiting deprecated Though blockmaxweight has been preferred for limiting the size of blocks returned by getblocktemplate since 0. Duplicate wallets disallowed Previously, it was possible to open the same wallet twice by manually copying the wallet file, causing issues when bitcoin qt copy blockchain login were opened simultaneously. Debug -minimumchainwork argument added A hidden debug argument -minimumchainwork has been added to allow a custom minimum work value to be used when validating a chain.

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Bitcoin Core runs as a full network node and maintains a local copy of the block chain. This data independence improves wallet privacy and security. With local access to the complete set of headers and transactions, Bitcoin Core can use full verification to tell when peers lie about payments.

However, dealing with the block chain comes at a price. An ever-growing data set causes smaller hard drives to fill up quickly. This article describes two approaches that can be used with either a new or existing Bitcoin Core 0.

To protect yourself from loss of funds, make a backup of your wallet now. After the backup has been saved, exit Bitcoin Core. The first step is finding the default data directory. Mac, Windows, and Linux version of Bitcoin Core each store data in a different location. The procedure described here will use a graphical file browser to find it. On Windows 7, begin by clicking on the Windows menu. Then click your username from the right-hand menu.

Windows Explorer should show a folder containing other folders such as Contacts and Desktop. Another folder, AppData is hidden by default. Windows Explorer should now display an AppData folder. Then enter the Roaming folder, where the Bitcoin folder is contained.

Double click on the Application Support folder. On Ubuntu, open a file browser by clicking on the folder icon in the launcher. Having found the default data directory, we can now copy it. Be sure that Bitcoin Core has been shut down and is no longer running. The software occasionally takes a minute or two to completely exit. Begin by renaming the Bitcoin Core data directory. Use the name bitcoin-backup. This allows recovery of the original data directory in case something goes wrong.

To recover the original, reinstate the original name of the bitcoin-backup folder either Bitcoin or. Next copy the renamed bitcoin data directory to a destination of your choice. This can be the same hard drive, an external hard drive, or a removable medium such as USB drive or SD card.

Copying data may require only a few minutes or a couple of hours, depending on how up-to-date your copy of the block chain is and the speed of your hardware. You can now rename the copied folder. For example, it might be convenient to use the name Bitcoin. With no default data directory, Bitcoin Core assumes that this is its first session. Launching Bitcoin Core should yield a welcome screen. This screen gives you to option to store data in the default location or a custom location.

Select the second option. Bitcoin Core should continue starting up. When the process completes, the software should work exactly as it did before. When ready to proceed to the next step, close the application. At this point your system contains two more or less identical copies of the data directory. Assuming there were no issues with the move, the original can now be deleted.

Browse to the location of the bitcoin-backup directory and delete it. Users of Armory on Mac face a tricky problem when trying to move the Bitcoin Core data directory. Armory only recognizes the default data directory on OS X. Moving it means that Armory will no longer function. Fortunately, the solution is relatively simple. Create a symbolic link from the new data directory to the old default directory.

Creating this link allows the new data directory to be used as if it still resided at the old location. Begin by launching the Terminal application. Instead of pulling the data directory out from under Bitcoin Core and then supplying a new path after startup, the data directory can be passed as the command line parameter datadir.

This approach keeps the existing default data directory intact. It also allows multiple data directories to be used side-by-side. Windows users can create a shortcut that uses the command line option datadir.

Doing so directs Bitcoin Core to use, not the default data directory, but the one given as a parameter. Browse to the location of the Bitcoin Core executable C: Next, add the command line option datadir , using the path to your data directory. Double clicking the newly-created shortcut will direct Bitcoin Core to use the new data directory. This places a shortcut on the desktop. Double clicking the resulting shortcut starts Bitcoin Core with the custom data directory. Although a similar shortcut-based approach will work on OS X, creating a clickable icon is much more difficult.

Copy the Data Directory Having found the default data directory, we can now copy it. Delete the Original Data Directory At this point your system contains two more or less identical copies of the data directory. Command Line Parameter Instead of pulling the data directory out from under Bitcoin Core and then supplying a new path after startup, the data directory can be passed as the command line parameter datadir.

Conclusions Moving the Bitcoin Core data directory can be helpful in two situations: Was this post useful? Get my newsletter direct to your inbox for free. No spam, just great content like this. Unsubscribe at any time.