BITCOIN-QT(1)

NAME
bitcoin-qt - manual page for bitcoin-qt v0.13.0.0

DESCRIPTION
Bitcoin Core version v0.13.0.0 (64-bit) Usage:

    bitcoin-qt [command-line options]

OPTIONS

-?

    Print this help message and exit

-version

    Print version and exit

-alertnotify=<cmd>

    Execute command when a relevant alert is received or we see a really long fork (%s in cmd is replaced by message)

-blocknotify=<cmd>

    Execute command when the best block changes (%s in cmd is replaced by block hash)

-checkblocks=<n>

    How many blocks to check at startup (default: 288, 0 = all)

-checklevel=<n>

    How thorough the block verification of -checkblocks is (0-4, default: 3)

-conf=<file>

    Specify configuration file (default: bitcoin.conf)

-datadir=<dir>

    Specify data directory

-dbcache=<n>

    Set database cache size in megabytes (4 to 16384, default: 300)

-loadblock=<file>

    Imports blocks from external blk000??.dat file on startup

-maxorphantx=<n>

    Keep at most <n> unconnectable transactions in memory (default: 100)

-maxmempool=<n>

    Keep the transaction memory pool below <n> megabytes (default: 300)

-mempoolexpiry=<n>

    Do not keep transactions in the mempool longer than <n> hours (default: 72)

-par=<n>

    Set the number of script verification threads (-4 to 16, 0 = auto, <0 = leave that many cores free, default: 0)

-pid=<file>

    Specify pid file (default: bitcoind.pid)

-prune=<n>

    Reduce storage requirements by enabling pruning (deleting) of old blocks. This allows the pruneblockchain RPC to be called to delete specific blocks, and enables automatic pruning of old blocks if a target size in MiB is provided. This mode is incompatible with -txindex and -rescan. Warning: Reverting this setting requires re-downloading the entire blockchain. (default: 0 = disable pruning blocks, 1 = allow manual pruning via RPC, >550 = automatically prune block files to stay under the specified target size in MiB)

-reindex-chainstate

    Rebuild chain state from the currently indexed blocks

-reindex

    Rebuild chain state and block index from the blk*.dat files on disk

-sysperms

    Create new files with system default permissions, instead of umask 077 (only effective with disabled wallet functionality)

-txindex

    Maintain a full transaction index, used by the getrawtransaction rpc call (default: 0)

Connection options:

-addnode=<ip>

    Add a node to connect to and attempt to keep the connection open

-banscore=<n>

    Threshold for disconnecting misbehaving peers (default: 100)

-bantime=<n>

    Number of seconds to keep misbehaving peers from reconnecting (default: 86400)

-bind=<addr>

    Bind to given address and always listen on it. Use [host]:port notation for IPv6

-connect=<ip>

    Connect only to the specified node(s)

-discover

    Discover own IP addresses (default: 1 when listening and no -externalip or -proxy)

-dns

    Allow DNS lookups for -addnode, -seednode and -connect (default: 1)

-dnsseed

    Query for peer addresses via DNS lookup, if low on addresses (default: 1 unless -connect)

-externalip=<ip>

    Specify your own public address

-forcednsseed

    Always query for peer addresses via DNS lookup (default: 0)

-listen

    Accept connections from outside (default: 1 if no -proxy or -connect)

-listenonion

    Automatically create Tor hidden service (default: 1)

-maxconnections=<n>

    Maintain at most <n> connections to peers (default: 125)

-maxreceivebuffer=<n>

    Maximum per-connection receive buffer, <n>*1000 bytes (default: 5000)

-maxsendbuffer=<n>

    Maximum per-connection send buffer, <n>*1000 bytes (default: 1000)

-maxtimeadjustment

    Maximum allowed median peer time offset adjustment. Local perspective of time may be influenced by peers forward or backward by this amount. (default: 4200 seconds)

-onion=<ip:port>

    Use separate SOCKS5 proxy to reach peers via Tor hidden services (default: -proxy)

-onlynet=<net>

    Only connect to nodes in network <net> (ipv4, ipv6 or onion)

-permitbaremultisig

    Relay non-P2SH multisig (default: 1)

-peerbloomfilters

    Support filtering of blocks and transaction with bloom filters (default: 1)

-port=<port>

    Listen for connections on <port> (default: 8333 or testnet: 18333)

-proxy=<ip:port>

    Connect through SOCKS5 proxy

-proxyrandomize

    Randomize credentials for every proxy connection. This enables Tor stream isolation (default: 1)

-seednode=<ip>

    Connect to a node to retrieve peer addresses, and disconnect

-timeout=<n>

    Specify connection timeout in milliseconds (minimum: 1, default: 5000)

-torcontrol=<ip>:<port>

    Tor control port to use if onion listening enabled (default: 127.0.0.1:9051)

-torpassword=<pass>

    Tor control port password (default: empty)

-whitebind=<addr>

    Bind to given address and whitelist peers connecting to it. Use [host]:port notation for IPv6

-whitelist=<netmask>

    Whitelist peers connecting from the given netmask or IP address. Can be specified multiple times. Whitelisted peers cannot be DoS banned and their transactions are always relayed, even if they are already in the mempool, useful e.g. for a gateway

-whitelistrelay

    Accept relayed transactions received from whitelisted peers even when not relaying transactions (default: 1)

-whitelistforcerelay

    Force relay of transactions from whitelisted peers even they violate local relay policy (default: 1)

-maxuploadtarget=<n>

    Tries to keep outbound traffic under the given target (in MiB per 24h), 0 = no limit (default: 0)

Wallet options:

-disablewallet

    Do not load the wallet and disable wallet RPC calls

-keypool=<n>

    Set key pool size to <n> (default: 100)

-fallbackfee=<amt>

    A fee rate (in BTC/kB) that will be used when fee estimation has insufficient data (default: 0.0002)

-mintxfee=<amt>

    Fees (in BTC/kB) smaller than this are considered zero fee for transaction creation (default: 0.00001)

-paytxfee=<amt>

    Fee (in BTC/kB) to add to transactions you send (default: 0.00)

-rescan

    Rescan the block chain for missing wallet transactions on startup

-salvagewallet

    Attempt to recover private keys from a corrupt wallet on startup

-spendzeroconfchange

    Spend unconfirmed change when sending transactions (default: 1)

-txconfirmtarget=<n>

    If paytxfee is not set, include enough fee so transactions begin confirmation on average within n blocks (default: 2)

-usehd

    Use hierarchical deterministic key generation (HD) after BIP32. Only has effect during wallet creation/first start (default: 1)

-upgradewallet

    Upgrade wallet to latest format on startup

-wallet=<file>

    Specify wallet file (within data directory) (default: wallet.dat)

-walletbroadcast

    Make the wallet broadcast transactions (default: 1)

-walletnotify=<cmd>

    Execute command when a wallet transaction changes (%s in cmd is replaced by TxID)

-zapwallettxes=<mode>

    Delete all wallet transactions and only recover those parts of the blockchain through -rescan on startup (1 = keep tx meta data e.g. account owner and payment request information, 2 = drop tx meta data)

ZeroMQ notification options:

-zmqpubhashblock=<address>

    Enable publish hash block in <address>

-zmqpubhashtx=<address>

    Enable publish hash transaction in <address>

-zmqpubrawblock=<address>

    Enable publish raw block in <address>

-zmqpubrawtx=<address>

    Enable publish raw transaction in <address>

Debugging/Testing options:

-uacomment=<cmt>

    Append comment to the user agent string

-debug=<category>

    Output debugging information (default: 0, supplying <category> is optional). If <category> is not supplied or if <category> = 1, output all debugging information.<category> can be: addrman, alert, bench, coindb, db, http, libevent, lock, mempool, mempoolrej, net, proxy, prune, rand, reindex, rpc, selectcoins, tor, zmq, qt.

-help-debug

    Show all debugging options (usage: --help -help-debug)

-logips

    Include IP addresses in debug output (default: 0)

-logtimestamps

    Prepend debug output with timestamp (default: 1)

-minrelaytxfee=<amt>

    Fees (in BTC/kB) smaller than this are considered zero fee for relaying, mining and transaction creation (default: 0.00001)

-maxtxfee=<amt>

    Maximum total fees (in BTC) to use in a single wallet transaction or raw transaction; setting this too low may abort large transactions (default: 0.10)

-printtoconsole

    Send trace/debug info to console instead of debug.log file

-shrinkdebugfile

    Shrink debug.log file on client startup (default: 1 when no -debug)

Chain selection options:

-testnet

    Use the test chain

Node relay options:

-bytespersigop

    Equivalent bytes per sigop in transactions for relay and mining (default: 20)

-datacarrier

    Relay and mine data carrier transactions (default: 1)

-datacarriersize

    Maximum size of data in data carrier transactions we relay and mine (default: 83)

-mempoolreplacement

    Enable transaction replacement in the memory pool (default: 1)

Block creation options:

-blockmaxweight=<n>

    Set maximum BIP141 block weight (default: 3000000)

-blockmaxsize=<n>

    Set maximum block size in bytes (default: 750000)

-blockprioritysize=<n>

    Set maximum size of high-priority/low-fee transactions in bytes (default: 0)

RPC server options:

-server

    Accept command line and JSON-RPC commands

-rest

    Accept public REST requests (default: 0)

-rpcbind=<addr>

    Bind to given address to listen for JSON-RPC connections. Use [host]:port notation for IPv6. This option can be specified multiple times (default: bind to all interfaces)

-rpccookiefile=<loc>

    Location of the auth cookie (default: data dir)

-rpcuser=<user>

    Username for JSON-RPC connections

-rpcpassword=<pw>

    Password for JSON-RPC connections

-rpcauth=<userpw>

    Username and hashed password for JSON-RPC connections. The field <userpw> comes in the format: <USERNAME>:<SALT>$<HASH>. A canonical python script is included in share/rpcuser. This option can be specified multiple times

-rpcport=<port>

    Listen for JSON-RPC connections on <port> (default: 8332 or testnet: 18332)

-rpcallowip=<ip>

    Allow JSON-RPC connections from specified source. Valid for <ip> are a single IP (e.g. 1.2.3.4), a network/netmask (e.g. 1.2.3.4/255.255.255.0) or a network/CIDR (e.g. 1.2.3.4/24). This option can be specified multiple times

-rpcthreads=<n>

    Set the number of threads to service RPC calls (default: 4)

UI Options:

-choosedatadir

    Choose data directory on startup (default: 0)

-lang=<lang>

    Set language, for example "de_DE" (default: system locale)

-min

    Start minimized

-rootcertificates=<file>

    Set SSL root certificates for payment request (default: -system-)

-splash

    Show splash screen on startup (default: 1)

-resetguisettings

    Reset all settings changed in the GUI

COPYRIGHT
Copyright (C) 2009-2016 The Bitcoin Core developers Please contribute if you find Bitcoin Core useful. Visit <https://bitcoincore.org> for further information about the software. The source code is available from <https://github.com/bitcoin/bitcoin>. This is experimental software. Distributed under the MIT software license, see the accompanying file COPYING or <http://www.opensource.org/licenses/mit-license.php>. This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit <https://www.openssl.org/> and cryptographic software written by Eric Young and UPnP software written by Thomas Bernard.