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Bitcoin Core installation binaries can be downloaded from bitcoincore. If you are running an older version, shut it down. Blocks will be stored on disk out of order in the order they are received, really , which makes it incompatible with some tools or other programs.
Reindexing using earlier versions will also not work anymore as a result of this. If you want to be able to downgrade smoothly, make a backup of your entire data directory. Without this your node will need start syncing or importing from bootstrap.
It is possible that the data from a completely synchronised 0. This does not affect wallet forward or backward compatibility. There are no known problems when downgrading from 0. At the time of this release, the P2P network is being flooded with low-fee transactions.
This causes a ballooning of the mempool size. If this growth of the mempool causes problematic memory use on your node, it is possible to change a few configuration options to work around this. The growth of the mempool can be monitored with the RPC command getmempoolinfo. One is to increase the minimum transaction relay fee minrelaytxfee , which defaults to 0. The other is to restrict the relaying of free transactions with limitfreerelay. It defaults to Reducing this number reduces the speed at which the mempool can grow due to free transactions.
This release supports running a fully validating node without maintaining a copy of the raw block and undo data on disk. To recap, there are four types of data related to the blockchain in the bitcoin system: The databases are built from the raw data.
The block index continues to hold the metadata about all blocks in the blockchain. The minimum allowed is MB. Note that this is in addition to whatever is required for the block index and UTXO databases.
The minimum was chosen so that Bitcoin Core will be able to maintain at least blocks on disk two days worth of blocks at 10 minutes per block. In rare instances it is possible that the amount of space used will exceed the pruning target in order to keep the required last blocks on disk. Thus, if the user specifies MB, once that level is reached the program will begin deleting the oldest block and undo files, while continuing to download the blockchain. For now, block pruning disables block relay.
Block pruning is currently incompatible with running a wallet due to the fact that block data is used for rescanning the wallet and importing keys or addresses which require a rescan. However, running the wallet with block pruning will be supported in the near future, subject to those limitations.
Once you have pruned blocks, going back to unpruned state requires re-downloading the entire blockchain. To do this, re-start the node with -reindex. Note also that any problem that would cause a user to reindex e. Finally, note that when a pruned node reindexes, it will delete any blk???. Experimental support for big-endian CPU architectures was added in this release. All little-endian specific code was replaced with endian-neutral constructs. The build system will automatically detect the endianness of the target.
There have been many changes in this release to reduce the default memory usage of a node, among which:. This release improves the algorithm used for fee estimation. Previously, -1 was returned when there was insufficient data to give an estimate. Now, -1 will also be returned when there is no fee or priority high enough for the desired confirmation target.
In those cases, it can help to ask for an estimate for a higher target number of blocks. This option allows separating transaction submission from the node functionality. Making use of this, third-party scripts can be written to take care of transaction re broadcast:. One such application is selective Tor usage, where the node runs on the normal internet but transactions are broadcasted over Tor.
For an example script see bitcoin-submittx. This release adds functionality to create a new circuit for every peer connection, when the software is used with Tor. The new option, -proxyrandomize , is on by default.
When enabled, every outgoing connection will potentially go through a different exit node. That significantly reduces the chance to get unlucky and pick a single exit node that is either malicious, or widely banned from the P2P network.
This improves connection reliability as well as privacy, especially for the initial connections. Detailed release notes follow.
This overview includes changes that affect behavior, not code moves, refactors and string updates. For convenience in locating the code changes and accompanying discussion, both the pull request and git merge commit are mentioned. As well as everyone that helped translating on Transifex. Bitcoin Core version 0. Please report bugs using the issue tracker at github: Downgrade warning Because release 0.
Important information Transaction flooding At the time of this release, the P2P network is being flooded with low-fee transactions. For example, add the following to bitcoin.