docs: update README.md
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README.md
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README.md
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[](http://copyfree.org)
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<!--[](https://pkg.go.dev/github.com/lbryio/lbcd)-->
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`lbcd` is a full node implementation of LBRY's blockchain written in Go (golang).
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**lbcd** is a full node implementation of LBRY's blockchain written in Go (golang).
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This project is currently under active development and is in a Beta state while
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we ensure it matches LBRYcrd's functionality. The intention is that it properly
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downloads, validates, and serves the block chain using the exact rules
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(including consensus bugs) for block acceptance as LBRYcrd.
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We have taken great care to avoid lbcd causing a fork to the blockchain.
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Software stack developed by LBRY teams has been all migrated to **lbcd**.
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Note: `lbcd` does *NOT* include wallet functionality. That functionality is provided by the
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We're working with exchanges and pool oerators to migrate from **lbrycrd** to **lbcd**.
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If you're integrating with **lbcd+lbcwallet**, please check the Wiki for current [supported RPCs](wiki/RPC-availability).
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Note: **lbcd** does *NOT* include wallet functionality. That functionality is provided by the
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[lbcwallet](https://github.com/lbryio/lbcwallet) and the [LBRY SDK](https://github.com/lbryio/lbry-sdk).
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## Requirements
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All common operating systems are supported. lbcd requires at least 8GB of RAM
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and at least 100GB of disk storage. Both RAM and disk requirements increase slowly over time.
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Using a fast NVMe disk is recommended.
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## Installation
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Acquire binary files from [releases](https://github.com/lbryio/lbcd/releases)
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For compilation, [Go](http://golang.org) 1.18 or newer is required.
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Install Go according to its [installation instructions](http://golang.org/doc/install).
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``` sh
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# lbcd (full node)
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$ go install github.com/lbryio/lbcd@latest
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# lbcctl (rpc client utility)
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$ go install github.com/lbryio/lbcd/cmd/lbcctl@latest
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```
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## Usage
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Default application folder `${LBCDDIR}`:
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- Linux: `~/.lbcd/`
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- MacOS: `/Users/<username>/Library/Application Support/Lbcd/`
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### Start the **lbcd**
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``` sh
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./lbcd
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```
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**lbcd** loads config file at `"${LBCDDIR}/lbcd.conf"`.
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If no config is found, it creates a [default one](sample-lbcd.conf), which includes all available options with default settings except randomly generated *RPC credentials* (see below).
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### RPC server
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RPC credentials (`rpcuser` and `rpcpass`) is required to enable RPC server. It can be specify in the `"${LBCDIR}/lbcd.conf"`, using command line options:
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``` sh
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./lbcd --rpcuser=rpcuser --rpcpass=rpcpass
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2022-07-28 12:28:19.627 [INF] RPCS: RPC server listening on 0.0.0.0:9245
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2022-07-28 12:28:19.627 [INF] RPCS: RPC server listening on [::]:9245
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```
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### Working with TLS (Default)
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By default, **lbcd** runs RPC server with TLS enabled, and generates the `rpc.cert` and `rpc.key` under `${LBCDDIR}`, if not exist already.
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To interact with the RPC server, a client has to either specify the `rpc.cert`, or disable the certification verification for TLS.
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Interact with **lbcd** RPC using `lbcctl`
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``` sh
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$ ./lbcctl --rpccert "${LBCDDIR}/rpc.cert" getblockcount
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# or disable the certificate verification
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$ ./lbcctl --skipverify getblockcount
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1200062
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```
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Interact with **lbcd** RPC using `curl`
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``` sh
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$ curl --user rpcuser:rpcpass \
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--cacert "${LBCDDIR}/rpc.cert" \
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--data-binary '{"jsonrpc": "1.0", "id": "curltest", "method": "getblockcount", "params": []}' \
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-H 'content-type: text/plain;' \
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https://127.0.0.1:9245/
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# or disable the certificate verification
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$ curl --user rpcuser:rpcpass \
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--insecure \
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--data-binary '{"jsonrpc": "1.0", "id": "curltest", "method": "getblockcount", "params": []}' \
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-H 'content-type: text/plain;' \
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https://127.0.0.1:9245/
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```
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``` json
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{"jsonrpc":"1.0","result":1200062,"error":null,"id":"curltest"}
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```
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### Working without TLS
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TLS can be disabled using the `--notls` option:
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``` sh
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$ ./lbcd --notls
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```
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``` sh
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$ ./lbcctl --notls getblockcount
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1200062
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```
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``` sh
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$ curl --user rpcuser:rpcpass \
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--data-binary '{"jsonrpc": "1.0", "id": "curltest", "method": "getblockcount", "params": []}' \
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-H 'content-type: text/plain;' \
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http://127.0.0.1:9245/
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```
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``` json
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{"jsonrpc":"1.0","result":1200062,"error":null,"id":"curltest"}
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```
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## Using Snapshots (optional)
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[Snapshots](https://snapshots.lbry.com/blockchain/) are created bi-weekly to help new users catch up current block height.
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The snapshots are archived and compressed in [zstd](https://facebook.github.io/zstd/) format for it's compression ratio and speed.
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Download the snapshot, and uncompress it:
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``` sh
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time curl -O https://snapshots.lbry.com/blockchain/lbcd_snapshot_1199527_v0.22.105_2022-07-27.tar.zst
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zstd -d lbcd_snapshot_1199527_v0.22.105_2022-07-27.tar.zst | tar xf - -C "${LBCDIR}"
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```
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If preferred, a user can download and uncompress the snapshot on the fly:
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By the time the download is finished, the snapshots should be almost uncompressed already.
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``` sh
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mkdir -p "${LBCDDIR}"
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time curl https://snapshots.lbry.com/blockchain/lbcd_snapshot_1199527_v0.22.105_2022-07-27.tar.zst | zstd -d | tar xf - -C "${LBCDIR}"
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# % Total % Received % Xferd Average Speed Time Time Time Current
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# Dload Upload Total Spent Left Speed
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# 100 64.9G 100 64.9G 0 0 37.0M 0 0:29:49 0:29:49 --:--:-- 33.0M
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#
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# real 29m49.962s
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# user 6m53.710s
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# sys 8m56.545s
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```
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## Working with RPCs
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Using `lbcctl -l` to list available RPCs:
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``` sh
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$ lbcctl -l
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Chain Server Commands:
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addnode "addr" "add|remove|onetry"
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createrawtransaction [{"txid":"value","vout":n},...] {"address":amount,...} (locktime)
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debuglevel "levelspec"
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decoderawtransaction "hextx"
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decodescript "hexscript"
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deriveaddresses "descriptor" ({"value":value})
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fundrawtransaction "hextx" {"changeaddress":changeaddress,"changeposition":changeposition,"changetype":changetype,"includewatching":includewatching,"lockunspents":lockunspents,"feerate":feerate,"subtractfeefromoutputs":[subtractfeefromoutput,...],"replaceable":replaceable,"conftarget":conftarget,"estimatemode":estimatemode} (iswitness)
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generate numblocks
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[skipped]
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Wallet Server Commands (--wallet):
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addmultisigaddress nrequired ["key",...] ("account")
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addwitnessaddress "address"
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backupwallet "destination"
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createmultisig nrequired ["key",...]
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createnewaccount "account"
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createwallet "walletname" (disableprivatekeys=false blank=false passphrase="" avoidreuse=false)
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dumpprivkey "address"
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dumpwallet "filename"
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encryptwallet "passphrase"
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estimatefee numblocks
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estimatepriority numblocks
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estimatesmartfee conftarget (estimatemode="CONSERVATIVE")
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getaccount "address"
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getaccountaddress "account"
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getaddressesbyaccount "account"
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[skipped]
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```
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Using `lbcctl help rpcname` to show the RPC spec:
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``` sh
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$ lbcctl help getblock
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getblock "hash" (verbosity=1)
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Returns information about a block given its hash.
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Arguments:
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1. hash (string, required) The hash of the block
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2. verbosity (numeric, optional, default=1) Specifies whether the block data should be returned as a hex-encoded string (0), as parsed data with a slice of TXIDs (1), or as parsed data with parsed transaction data (2)
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Result (verbosity=0):
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"value" (string) Hex-encoded bytes of the serialized block
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Result (verbosity=1):
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{
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"getblockverboseresultbase": { (object)
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"hash": "value", (string) The hash of the block (same as provided)
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"confirmations": n, (numeric) The number of confirmations
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"strippedsize": n, (numeric) The size of the block without witness data
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"size": n, (numeric) The size of the block
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"weight": n, (numeric) The weight of the block
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"height": n, (numeric) The height of the block in the block chain
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"version": n, (numeric) The block version
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"versionHex": "value", (string) The block version in hexadecimal
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"merkleroot": "value", (string) Root hash of the merkle tree
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"time": n, (numeric) The block time in seconds since 1 Jan 1970 GMT
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"mediantime": n, (numeric) The median block time in seconds since 1 Jan 1970 GMT
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"nonce": n, (numeric) The block nonce
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"bits": "value", (string) The bits which represent the block difficulty
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"difficulty": n.nnn, (numeric) The proof-of-work difficulty as a multiple of the minimum difficulty
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"chainwork": "value", (string) Expected number of hashes required to produce the chain up to this block (in hex)
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"previousblockhash": "value", (string) The hash of the previous block
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"nextblockhash": "value", (string) The hash of the next block (only if there is one)
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"nameclaimroot": "value", (string) Root hash of the claim trie
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"nTx": n, (numeric) The number of transactions (aka, count of TX)
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},
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"tx": ["value",...], (array of string) The transaction hashes (only when verbosity=1)
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}
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```
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## **lbcd** & **lbcwallet**
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*Wallet* related functianlities and RPCs are provided by a separate programe - [**lbcwallet**](https://github.com/lbryio/lbcwallet).
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Once setup, lbcwallet can serve wallet related RPCs as well as proxy lbcd RPCs to an assocated lbcd now.
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It's sufficient for user to connect just the **lbcwallet** instead of both.
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``` mermaid
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sequenceDiagram
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actor C as lbcctl
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participant W as lbcwallet (port: 9244)
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participant D as lbcd (port: 9245)
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rect rgb(200,200,200)
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Note over C,D: lbcctl getblockcount
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C ->>+ D: getblockcount
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D -->>- C: response
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end
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rect rgb(200,200,200)
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Note over C,W: lbcctl --wallet balance
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C ->>+ W: getbalance
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W -->>- C: response
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end
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rect rgb(200,200,200)
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Note over C,D: lbcctl --wallet getblockcount (lbcd RPC service proxied by lbcwallet)
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C ->>+ W: getblockcount
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W ->>+ D: getblockcount
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D -->>- W: response
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W -->>- C: response
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end
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```
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While **lbcd** can run standalone as a full node, **lbcwallet** requires an associated **lbcd** instance for scanning and sync'ing block data.
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``` mermaid
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sequenceDiagram
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participant W as lbcwallet (RPC port: 9244)
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participant D as lbcd (RPC port: 9245, P2P port: 9246)
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participant D2 as other lbcd node(s) (P2P port: 9246)
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rect rgb(200,200,200)
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Note over W,D: Asynchronous websocket notifications
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W ->> D: subscribe to notifications
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D -->> W: notification
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D -->> W: notification
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end
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rect rgb(200,200,200)
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Note over W,D: lbcd RPCs
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W ->>+ D: getblockheader
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D ->>- W: response
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end
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rect rgb(200,200,200)
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Note over D,D2: P2P messages over port 9246
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D -->> D2: P2P message
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D2 -->> D: P2P message
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end
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```
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## Data integrity
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**lbcd** is not immune to data loss. It expects a clean shutdown via SIGINT or
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SIGTERM. SIGKILL, immediate VM kills, and sudden power loss can cause data
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corruption, thus requiring chain resynchronization for recovery.
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## Security
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We take security seriously. Please contact [security](mailto:security@lbry.com) regarding any security issues.
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@ -24,97 +317,6 @@ Our PGP key is [here](https://lbry.com/faq/pgp-key) if you need it.
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We maintain a mailing list for notifications of upgrades, security issues,
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and soft/hard forks. To join, visit [fork list](https://lbry.com/forklist)
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## Requirements
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All common operating systems are supported. lbcd requires at least 8GB of RAM
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and at least 100GB of disk storage. Both RAM and disk requirements increase slowly over time.
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Using a fast NVMe disk is recommended.
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`lbcd` is not immune to data loss. It expects a clean shutdown via SIGINT or
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SIGTERM. SIGKILL, immediate VM kills, and sudden power loss can cause data
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corruption, thus requiring chain resynchronization for recovery.
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For compilation, [Go](http://golang.org) 1.16 or newer is required.
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## Installation
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Acquire binary files from [releases](https://github.com/lbryio/lbcd/releases)
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### To build from Source on Linux/BSD/MacOSX/POSIX
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Install Go according to its [installation instructions](http://golang.org/doc/install).
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``` sh
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git clone https://github.com/lbryio/lbcd
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cd lbcd
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# Build lbcd
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go build .
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# Build lbcctl
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go build ./cmd/lbcctl
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```
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Both [GoLand](https://www.jetbrains.com/go/)
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and [VS Code](https://code.visualstudio.com/docs/languages/go) IDEs are supported.
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## Usage
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By default, data and logs are stored in `<LBCDDIR>`:
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- Linux: `~/.lbcd/`
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- MacOS: `/Users/<username>/Library/Application Support/Lbcd/`
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To enable RPC access a username and password is required. Example:
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``` sh
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./lbcd --rpcuser=rpcuser --rpcpass=rpcpass
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```
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Interact with lbcd via RPC using `lbcctl`
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``` sh
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./lbcctl --rpcuser=rpcuser --rpcpass=rpcpass getblockcount
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./lbcctl --rpcuser=rpcuser --rpcpass=rpcpass getblocktemplate
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```
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By default, the RPCs are served over TLS. `lbcd` generates (if not exists) `rpc.cert` and
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`rpc.key` under `<LBCDDIR>` where `lbcctl` would search and use them.
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The RPCs can also be served without TLS *(on localhost only)* using (`--notls`)
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``` sh
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./lbcd --rpcuser=rpcuser --rpcpass=rpcpass --notls
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./lbcctl --rpcuser=rpcuser --rpcpass=rpcpass --notls getblockcount
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```
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## Working with Different Networks
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By default, `lbcd` and `lbcctl` use the following ports for different networks respectively:
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| Network | RPC Port | Network Port |
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| ------- | -------- | ------------ |
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| mainnet | 9245 | 9246 |
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| testnet | 19245 | 19246 |
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| regtest | 29245 | 29246 |
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Running `lbcd` and `lbcctl` with `--testnet` or `--regtest` would use different chain params as well as default RPC and Network ports.
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``` sh
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./lbcd --rpcuser=rpcuser --rpcpass=rpcpass --regtest
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./lbcctl --rpcuser=rpcuser --rpcpass=rpcpass --regtest getblockcount
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```
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The default Network and RPC ports of `lbcd` can be overriden using `--listen` and `--rpclisten`
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`lbcctl` can also connect to RPC server specified by `--rpcserver`
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``` sh
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./lbcd --rpcuser=rpcuser --rpcpass=rpcpass --regtest --listen=127.0.0.1:29248 --rpclisten=127.0.0.1:29247
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./lbcctl --rpcuser=rpcuser --rpcpass=rpcpass --regtest --rpcserver=127.0.0.1:29247 getblockcount
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```
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Note: Wallet related RPCs are provided by [lbcwallet](https://github.com/lbryio/lbcwallet).
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## Contributing
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Contributions to this project are welcome, encouraged, and compensated.
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