bitcoind - manual page for bitcoind v0.29.6


bitcoind [options] Start Bitcoin ABC


Bitcoin ABC version v0.29.6



Print this help message and exit


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


If this block is in the chain assume that it and its ancestors are valid and potentially skip their script verification (0 to verify all, default: 00000000000000001669a67e76366dd03b1265d299954c5234e4e2483eecb321, testnet: 000000000008afd8c37f77f1bf7316125d98a0ca261827e8db62385228ce36cc)


Maintain an index of compact filters by block (default: 0, values: basic). If <type> is not supplied or if <type> = 1, indexes for all known types are enabled.


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


Extra transactions to keep in memory for compact block reconstructions (default: 100)


Specify directory to hold blocks subdirectory for *.dat files (default: <datadir>)


Whether to reject transactions from network peers.

Automatic broadcast

and rebroadcast of any transactions from inbound peers is disabled, unless the peer has the 'forcerelay' permission. RPC transactions are not affected. (default: 0)


Maintain coinstats index used by the gettxoutsetinfo RPC (default: 0)


Specify path to read-only configuration file. Relative paths will be prefixed by datadir location. (default: bitcoin.conf)


Run in the background as a daemon and accept commands (default: 0)


Wait for initialization to be finished before exiting. This implies -daemon (default: 0)


Specify data directory


Set database cache size in MiB (4 to 16384, default: 1024)


Specify location of debug log file. Relative paths will be prefixed by a net-specific datadir location. (-nodebuglogfile to disable; default: debug.log)


Use the eCash prefixes and units (default: true)


Specify additional configuration file, relative to the -datadir path (only useable from configuration file, not command line)


Imports blocks from external file on startup


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


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


Do not keep transactions in the mempool longer than <n> hours (default: 336)


Set the number of script verification threads (-4 to 15, 0 = auto, <0 = leave that many cores free, default: 0)


Whether to save the mempool on shutdown and load on restart (default: 1)


Specify pid file. Relative paths will be prefixed by a net-specific datadir location. (default:


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, -coinstatsindex 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)


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


Rebuild chain state from the currently indexed blocks. When in pruning mode or if blocks on disk might be corrupted, use full -reindex instead.


Specify path to dynamic settings data file. Can be disabled with -nosettings. File is written at runtime and not meant to be edited by users (use bitcoin.conf instead for custom settings). Relative paths will be prefixed by datadir location. (default: settings.json)


Execute command on startup.


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


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


Use Cash Address for destination encoding instead of base58 (activate by default on Jan, 14)


Print version and exit

Connection options:


Add a node to connect to and attempt to keep the connection open (see the `addnode` RPC command help for more info)


Specify asn mapping used for bucketing of the peers (default: Relative paths will be prefixed by the net-specific datadir location.


Default duration (in seconds) of manually configured bans (default: 86400)


Bind to given address and always listen on it (default: Use [host]:port notation for IPv6. Append =onion to tag any incoming connections to that address and port as incoming Tor connections (default:, testnet:, regtest:


Connect only to the specified node(s); -connect=0 disables automatic connections (the rules for this peer are the same as for -addnode)


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


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


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


Specify your own public address


Allow fixed seeds if DNS seeds don't provide peers (default: 1)


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


If set and -i2psam is also set then incoming I2P connections are accepted via the SAM proxy. If this is not set but -i2psam is set then only outgoing connections will be made to the I2P network. Ignored if -i2psam is not set. Listening for incoming I2P connections is done through the SAM proxy, not by binding to a local address and port (default: 1)


I2P SAM proxy to reach I2P peers and accept I2P connections (default: none)


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


Automatically create Tor onion service (default: 1)


Maintain at most <n> connections to peers. The effective limit depends on system limitations and might be lower than the specified value (default: 4096)


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


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


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)


Tries to keep outbound traffic under the given target (in MiB per 24h). Limit does not apply to peers with 'download' permission. 0 = no limit (default: 0)


Use NAT-PMP to map the listening port (default: 0)


Enable all P2P network activity (default: 1). Can be changed by the setnetworkactive RPC command


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


Make outgoing connections only through network <net> (ipv4, ipv6, onion, i2p). Incoming connections are not affected by this option. This option can be specified multiple times to allow multiple networks. Warning: if it is used with non-onion networks and the -onion or -proxy option is set, then outbound onion connections will still be made; use -noonion or -onion=0 to disable outbound onion connections in this case


If set, only use the specified DNS seed when querying for peer addresses via DNS lookup.


Serve compact block filters to peers per BIP 157 (default: 0)


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


Specify p2p connection timeout in seconds. This option determines the amount of time a peer may be inactive before the connection to it is dropped. (minimum: 1, default: 60)


Relay non-P2SH multisig (default: 1)


Listen for connections on <port>. Nodes not using the default ports (default: 8333, testnet: 18333, regtest: 18444) are unlikely to get incoming connections. Not relevant for I2P (see doc/


Connect through SOCKS5 proxy


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


Connect to a node to retrieve peer addresses, and disconnect


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


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


Tor control port password (default: empty)


Use UPnP to map the listening port (default: 0)


Bind to the given address and add permission flags to the peers connecting to it.Use [host]:port notation for IPv6. Allowed permissions: bloomfilter (allow requesting BIP37 filtered blocks and transactions), noban (do not ban for misbehavior; implies download), forcerelay (relay transactions that are already in the mempool; implies relay), relay (relay even in -blocksonly mode, and unlimited transaction announcements), mempool (allow requesting BIP35 mempool contents), download (allow getheaders during IBD, no disconnect after maxuploadtarget limit), bypass_proof_request_limits (experimental, bypass the limits on avalanche proof downloads), addr (responses to GETADDR avoid hitting the cache and contain random records with the most up-to-date info). Specify multiple permissions separated by commas (default: download,noban,mempool,relay). Can be specified multiple times.

-whitelist=<[permissions@]IP address or network>

Add permission flags to the peers connecting from the given IP address (e.g. or CIDR-notated network (e.g. Uses the same permissions as -whitebind. Can be specified multiple times.

Wallet options:


Group outputs by address, selecting all or none, instead of selecting on a per-output basis. Privacy is improved as an address is only used once (unless someone sends to it after spending from it), but may result in slightly higher fees as suboptimal coin selection may result due to the added limitation (default: 0 (always enabled for wallets with "avoid_reuse" enabled))


Do not load the wallet and disable wallet RPC calls


A fee rate (in XEC/kB) that will be used when fee estimation has insufficient data. 0 to entirely disable the fallbackfee feature. (default: 0.00)


Set key pool size to <n> (default: 1000). Warning: Smaller sizes may increase the risk of losing funds when restoring from an old backup, if none of the addresses in the original keypool have been used.


Spend up to this amount in additional (absolute) fees (in XEC) if it allows the use of partial spend avoidance (default: 0.00)


Fees (in XEC/kB) smaller than this are considered zero fee for transaction creation (default: 10.00)


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


Rescan the block chain for missing wallet transactions on startup


Spend unconfirmed change when sending transactions (default: 1)


Specify wallet path to load at startup. Can be used multiple times to load multiple wallets. Path is to a directory containing wallet data and log files. If the path is not absolute, it is interpreted relative to <walletdir>. This only loads existing wallets and does not create new ones. For backwards compatibility this also accepts names of existing top-level data files in <walletdir>.


Make the wallet broadcast transactions (default: 1)


Specify directory to hold wallets (default: <datadir>/wallets if it exists, otherwise <datadir>)


Execute command when a wallet transaction changes. %s in cmd is replaced by TxID and %w is replaced by wallet name. %w is not currently implemented on windows. On systems where %w is supported, it should NOT be quoted because this would break shell escaping used to invoke the command.

ZeroMQ notification options:


Enable publish hash block in <address>


Set publish hash block outbound message high water mark (default: 1000)


Enable publish hash transaction in <address>


Set publish hash transaction outbound message high water mark (default: 1000)


Enable publish raw block in <address>


Set publish raw block outbound message high water mark (default: 1000)


Enable publish raw transaction in <address>


Set publish raw transaction outbound message high water mark (default: 1000)


Enable publish hash block and tx sequence in <address>


Set publish hash sequence message high water mark (default: 1000)

Debugging/Testing options:


Output debugging information (default: -nodebug, supplying <category> is optional). If <category> is not supplied or if <category> = 1, output all debugging information. <category> can be: addrman, avalanche, bench, blockstorage, chronik, cmpctblock, coindb, estimatefee, http, i2p, leveldb, libevent, mempool, mempoolrej, net, netdebug, proxy, prune, qt, rand, reindex, rpc, selectcoins, tor, txpackages, validation, walletdb, zmq. This option can be specified multiple times to output multiple categories.


Exclude debugging information for a category. Can be used in conjunction with -debug=1 to output debug logs for all categories except the specified category. This option can be specified multiple times to exclude multiple categories.


Print help message with debugging options and exit


Include IP addresses in debug output (default: 0)


Prepend debug output with name of the originating source location (source file, line number and function name) (default: 0)


Prepend debug output with timestamp (default: 1)


Maximum total fees (in XEC) to use in a single wallet transaction or raw transaction; setting this too low may abort large transactions (default: 100000.00)


Send trace/debug info to console (default: 1 when no -daemon. To disable logging to file, set -nodebuglogfile)


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


Set user agent client name


Set user agent client version


Append comment to the user agent string

Chain selection options:


Use the chain <chain> (default: main). Allowed values: main, test, regtest


Use the test chain. Equivalent to -chain=test.

Node relay options:


Equivalent bytes per sigCheck in transactions for relay and mining (default: 50).


DEPRECATED: Equivalent bytes per sigCheck in transactions for relay and mining (default: 50). This has been deprecated since v0.26.8 and will be removed in the future, please use -bytespersigcheck instead.


Relay and mine data carrier transactions (default: 1)


Maximum size of data in data carrier transactions we relay and mine (default: 223)


Fees (in XEC/kB) smaller than this are rejected for relaying, mining and transaction creation (default: 10.00)


Add 'forcerelay' permission to whitelisted inbound peers with default permissions. This will relay transactions even if the transactions were already in the mempool (default: 0)


Add 'relay' permission to whitelisted inbound peers with default permissions. This will accept relayed transactions even when not relaying transactions (default: 1)

Block creation options:


Set maximum block size in bytes (default: 2000000)


Set lowest fee rate (in XEC/kB) for transactions to be included in block creation. (default: 10.00)

RPC server options:


Accept public REST requests (default: 0)


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


Username and HMAC-SHA-256 hashed password for JSON-RPC connections. The field <userpw> comes in the format: <USERNAME>:<SALT>$<HASH>. A canonical python script is included in share/rpcauth. The client then connects normally using the rpcuser=<USERNAME>/rpcpassword=<PASSWORD> pair of arguments. This option can be specified multiple times


Bind to given address to listen for JSON-RPC connections. Do not expose the RPC server to untrusted networks such as the public internet! This option is ignored unless -rpcallowip is also passed. Port is optional and overrides -rpcport. Use [host]:port notation for IPv6. This option can be specified multiple times (default: and ::1 i.e., localhost)


Location of the auth cookie. Relative paths will be prefixed by a net-specific datadir location. (default: data dir)


Domain from which to accept cross origin requests (browser enforced)


Password for JSON-RPC connections


Listen for JSON-RPC connections on <port> (default: 8332, testnet: 18332, regtest: 18443)


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


Username for JSON-RPC connections


Set a whitelist to filter incoming RPC calls for a specific user. The field <whitelist> comes in the format: <USERNAME>:<rpc 1>,<rpc 2>,...,<rpc n>. If multiple whitelists are set for a given user, they are set-intersected. See -rpcwhitelistdefault documentation for information on default whitelist behavior.


Sets default behavior for rpc whitelisting. Unless rpcwhitelistdefault is set to 0, if any -rpcwhitelist is set, the rpc server acts as if all rpc users are subject to empty-unless-otherwise-specified whitelists. If rpcwhitelistdefault is set to 1 and no -rpcwhitelist is set, rpc server acts as if all rpc users are subject to empty whitelists.


Accept command line and JSON-RPC commands

Avalanche options:


Mandatory cooldown between two avapoll in milliseconds (default: 100)


Avalanche proof delegation to the master key used by this node (default: none). Should be used in conjunction with -avaproof and -avamasterkey


Enable the avalanche feature (default: 1)


Mandatory cooldown before a proof conflicting with an already registered one can be considered in seconds (default: 60)


Mandatory cooldown before a peer can be replaced in seconds (default: 86400)


Enable the avalanche staking rewards feature (default: 1, testnet: 0, regtest: 0)


Master key associated with the proof. If a proof is required, this is mandatory.


Minimum number of node that needs to send us an avaproofs message before we consider we have a usable quorum (default: 8)


Minimum proportion of known stake we need nodes for to have a usable quorum (default: 0.8)


Minimum amount of known stake for a usable quorum (default: 10000000000.00)


Avalanche proof to be used by this node (default: none)


Factor affecting the number of avalanche votes before a voted item goes stale when voting confidence is high (default: 64)


Number of avalanche votes before a voted item goes stale when voting confidence is low (default: 4096)


Avalanche query timeout in milliseconds (default: 10000)


Set the maximum number of avalanche outbound peers to connect to. Note that this option takes precedence over the -maxconnections option (default: 300).


Whether to save the avalanche peers upon shutdown and load them upon startup (default: 1).

Chronik options:


Enable the Chronik indexer, which can be read via a dedicated HTTP/Protobuf interface (default: 0)


Bind the Chronik indexer to the given address to listen for HTTP/Protobuf connections to access the index. Unlike the JSON-RPC, it's ok to have this publicly exposed on the internet. This option can be specified multiple times (default:, ::1; default port: 8331, testnet: 18331, regtest: 18442)


Enable LOKAD ID indexing in Chronik (default: 1)


Output some performance statistics (e.g. num cache hits, seconds spent) into a <datadir>/perf folder. (default: 0)


Reindex the Chronik indexer from genesis, but leave the other indexes untouched


Enable token indexing in Chronik (default: 1)


Tuning param of the TxNumCache, specifies how many buckets to use on the belt. Caution against setting this too high, it may slow down indexing. Set to 0 to disable. (default: 10)


Tuning param of the TxNumCache, specifies the size of each bucket on the belt. Unlike the number of buckets, this may be increased without much danger of slowing the indexer down. The total cache size will be `num_buckets * bucket_size * 40B`, so by default the cache will require 40000kB of memory. (default: 100000)


Copyright (C) 2009-2024 The Bitcoin developers

Please contribute if you find Bitcoin ABC useful. Visit <> for further information about the software. The source code is available from <>.

This is experimental software. Distributed under the MIT software license, see the accompanying file COPYING or <>

This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit <> and cryptographic software written by Eric Young and UPnP software written by Thomas Bernard.