lbcd

README

lbcd

lbcd is a full node implementation of LBRY's blockchain written in Go (golang).

This project is currently under active development and is in a Beta state while we ensure it matches LBRYcrd's functionality. The intention is that it properly downloads, validates, and serves the block chain using the exact rules (including consensus bugs) for block acceptance as LBRYcrd. We have taken great care to avoid lbcd causing a fork to the blockchain.

Note: lbcd does NOT include wallet functionality. That functionality is provided by the lbcwallet and the LBRY SDK.

Security

We take security seriously. Please contact security regarding any security issues. Our PGP key is here if you need it.

We maintain a mailing list for notifications of upgrades, security issues, and soft/hard forks. To join, visit fork list

Requirements

All common operating systems are supported. lbcd requires at least 8GB of RAM and at least 100GB of disk storage. Both RAM and disk requirements increase slowly over time. Using a fast NVMe disk is recommended.

lbcd is not immune to data loss. It expects a clean shutdown via SIGINT or SIGTERM. SIGKILL, immediate VM kills, and sudden power loss can cause data corruption, thus requiring chain resynchronization for recovery.

For compilation, Go 1.16 or newer is required.

Installation

Acquire binary files from releases

To build from Source on Linux/BSD/MacOSX/POSIX

Install Go according to its installation instructions.

git clone https://github.com/lbryio/lbcd
cd lbcd

# Build lbcd
go build .

# Build lbcctl
go build ./cmd/lbcctl

Both GoLand and VS Code IDEs are supported.

Usage

By default, data and logs are stored in <LBCDDIR>:

• Linux: ~/.lbcd/
• MacOS: /Users/<username>/Library/Application Support/Lbcd/

To enable RPC access a username and password is required. Example:

./lbcd --rpcuser=rpcuser --rpcpass=rpcpass

Interact with lbcd via RPC using lbcctl

./lbcctl --rpcuser=rpcuser --rpcpass=rpcpass getblockcount
./lbcctl --rpcuser=rpcuser --rpcpass=rpcpass getblocktemplate

By default, the RPCs are served over TLS. lbcd generates (if not exists) rpc.cert and rpc.key under <LBCDDIR> where lbcctl would search and use them.

The RPCs can also be served without TLS (on localhost only) using (--notls)

./lbcd --rpcuser=rpcuser --rpcpass=rpcpass --notls
./lbcctl --rpcuser=rpcuser --rpcpass=rpcpass --notls getblockcount

Working with Different Networks

By default, lbcd and lbcctl use the following ports for different networks respectively:

Network	RPC Port	Network Port
mainnet	9245	9246
testnet	19245	19246
regtest	29245	29246

Running lbcd and lbcctl with --testnet or --regtest would use different chain params as well as default RPC and Network ports.

./lbcd --rpcuser=rpcuser --rpcpass=rpcpass --regtest
./lbcctl --rpcuser=rpcuser --rpcpass=rpcpass --regtest getblockcount

The default Network and RPC ports of lbcd can be overriden using --listen and --rpclisten lbcctl can also connect to RPC server specified by --rpcserver

./lbcd --rpcuser=rpcuser --rpcpass=rpcpass --regtest --listen=127.0.0.1:29248 --rpclisten=127.0.0.1:29247
./lbcctl --rpcuser=rpcuser --rpcpass=rpcpass --regtest --rpcserver=127.0.0.1:29247 getblockcount

Note: Wallet related RPCs are provided by lbcwallet.

Contributing

Contributions to this project are welcome, encouraged, and compensated. The integrated github issue tracker is used for this project. All pull requests will be considered.

License

lbcd is licensed under the copyfree ISC License.

Documentation

Overview

lbcd is a full-node bitcoin implementation written in Go.

The default options are sane for most users. This means lbcd will work 'out of the box' for most users. However, there are also a wide variety of flags that can be used to control it.

The following section provides a usage overview which enumerates the flags. An interesting point to note is that the long form of all of these options (except -C) can be specified in a configuration file that is automatically parsed when lbcd starts up. By default, the configuration file is located at ~/.lbcd/lbcd.conf on POSIX-style operating systems and %LOCALAPPDATA%\lbcd\lbcd.conf on Windows. The -C (--configfile) flag, as shown below, can be used to override this location.

Usage:

lbcd [OPTIONS]

Application Options:

    --addcheckpoint=        Add a custom checkpoint.  Format:
                            '<height>:<hash>'
-a, --addpeer=              Add a peer to connect with at startup
    --addrindex             Maintain a full address-based transaction index
                            which makes the searchrawtransactions RPC
                            available
    --banduration=          How long to ban misbehaving peers.  Valid time
                            units are {s, m, h}.  Minimum 1 second (default:
                            24h0m0s)
    --banthreshold=         Maximum allowed ban score before disconnecting
                            and banning misbehaving peers. (default: 100)
    --blockmaxsize=         Maximum block size in bytes to be used when
                            creating a block (default: 750000)
    --blockminsize=         Mininum block size in bytes to be used when
                            creating a block
    --blockmaxweight=       Maximum block weight to be used when creating a
                            block (default: 3000000)
    --blockminweight=       Mininum block weight to be used when creating a
                            block
    --blockprioritysize=    Size in bytes for high-priority/low-fee
                            transactions when creating a block (default:
                            50000)
    --blocksonly            Do not accept transactions from remote peers.
-C, --configfile=           Path to configuration file
    --connect=              Connect only to the specified peers at startup
    --cpuprofile=           Write CPU profile to the specified file
-b, --datadir=              Directory to store data
    --dbtype=               Database backend to use for the Block Chain
                            (default: ffldb)
-d, --debuglevel=           Logging level for all subsystems {trace, debug,
                            info, warn, error, critical} -- You may also
                            specify
                            <subsystem>=<level>,<subsystem2>=<level>,... to
                            set the log level for individual subsystems --
                            Use show to list available subsystems (default:
                            info)
    --dropaddrindex         Deletes the address-based transaction index from
                            the database on start up and then exits.
    --dropcfindex           Deletes the index used for committed filtering
                            (CF) support from the database on start up and
                            then exits.
    --droptxindex           Deletes the hash-based transaction index from the
                            database on start up and then exits.
    --externalip=           Add an ip to the list of local addresses we claim
                            to listen on to peers
    --generate              Generate (mine) bitcoins using the CPU
    --limitfreerelay=       Limit relay of transactions with no transaction
                            fee to the given amount in thousands of bytes per
                            minute (default: 15)
    --listen=               Add an interface/port to listen for connections
                            (default all interfaces port: 9246, testnet:
                            19246, regtest: 29246, signet: 39246)
    --logdir=               Directory to log output
    --maxorphantx=          Max number of orphan transactions to keep in
                            memory (default: 100)
    --maxpeers=             Max number of inbound and outbound peers
                            (default: 125)
    --memprofile=           Write memory profile to the specified file
    --miningaddr=           Add the specified payment address to the list of
                            addresses to use for generated blocks -- At least
                            one address is required if the generate option is
                            set
    --minrelaytxfee=        The minimum transaction fee in BTC/kB to be
                            considered a non-zero fee. (default: 1e-05)
    --nobanning             Disable banning of misbehaving peers
    --nocfilters            Disable committed filtering (CF) support
    --nocheckpoints         Disable built-in checkpoints.  Don't do this
                            unless you know what you're doing.
    --nodnsseed             Disable DNS seeding for peers
    --nolisten              Disable listening for incoming connections --
                            NOTE: Listening is automatically disabled if the
                            --connect or --proxy options are used without
                            also specifying listen interfaces via --listen
    --noonion               Disable connecting to tor hidden services
    --nopeerbloomfilters    Disable bloom filtering support
    --norelaypriority       Do not require free or low-fee transactions to
                            have high priority for relaying
    --norpc                 Disable built-in RPC server -- NOTE: The RPC
                            server is disabled by default if no
                            rpcuser/rpcpass or rpclimituser/rpclimitpass is
                            specified
    --notls                 Disable TLS for the RPC server
    --onion=                Connect to tor hidden services via SOCKS5 proxy
                            (eg. 127.0.0.1:9050)
    --onionpass=            Password for onion proxy server
    --onionuser=            Username for onion proxy server
    --profile=              Enable HTTP profiling on given port -- NOTE port
                            must be between 1024 and 65536
    --proxy=                Connect via SOCKS5 proxy (eg. 127.0.0.1:9050)
    --proxypass=            Password for proxy server
    --proxyuser=            Username for proxy server
    --regtest               Use the regression test network
    --rejectnonstd          Reject non-standard transactions regardless of
                            the default settings for the active network.
    --relaynonstd           Relay non-standard transactions regardless of the
                            default settings for the active network.
    --rpccert=              File containing the certificate file
    --rpckey=               File containing the certificate key
    --rpclimitpass=         Password for limited RPC connections
    --rpclimituser=         Username for limited RPC connections
    --rpclisten=            Add an interface/port to listen for RPC
                            connections (default port: 9245, testnet: 19245, regtest: 29245)
    --rpcmaxclients=        Max number of RPC clients for standard
                            connections (default: 10)
    --rpcmaxconcurrentreqs= Max number of concurrent RPC requests that may be
                            processed concurrently (default: 20)
    --rpcmaxwebsockets=     Max number of RPC websocket connections (default:
                            25)
    --rpcquirks             Mirror some JSON-RPC quirks of Bitcoin Core --
                            NOTE: Discouraged unless interoperability issues
                            need to be worked around
-P, --rpcpass=              Password for RPC connections
-u, --rpcuser=              Username for RPC connections
    --sigcachemaxsize=      The maximum number of entries in the signature
                            verification cache (default: 100000)
    --simnet                Use the simulation test network
    --testnet               Use the test network
    --torisolation          Enable Tor stream isolation by randomizing user
                            credentials for each connection.
    --trickleinterval=      Minimum time between attempts to send new
                            inventory to a connected peer (default: 10s)
    --txindex               Maintain a full hash-based transaction index
                            which makes all transactions available via the
                            getrawtransaction RPC
    --uacomment=            Comment to add to the user agent -- See BIP 14
                            for more information.
    --upnp                  Use UPnP to map our listening port outside of NAT
-V, --version               Display version information and exit
    --whitelist=            Add an IP network or IP that will not be banned.
                            (eg. 192.168.1.0/24 or ::1)

Help Options:

-h, --help           Show this help message