git / moonbite-core / doc/files.md · raw
# Bitcoin Core file system**Contents**- [Data directory location](#data-directory-location)- [Data directory layout](#data-directory-layout)- [Multi-wallet environment](#multi-wallet-environment) - [Berkeley DB database based wallets](#berkeley-db-database-based-wallets) - [SQLite database based wallets](#sqlite-database-based-wallets)- [GUI settings](#gui-settings)- [Legacy subdirectories and files](#legacy-subdirectories-and-files)- [Notes](#notes)## Data directory locationThe data directory is the default location where the Litecoin Core files are stored.1. The default data directory paths for supported platforms are:Platform | Data directory path---------|--------------------Linux | `$HOME/.litecoin/`macOS | `$HOME/Library/Application Support/Litecoin/`Windows | `%APPDATA%\Litecoin\` <sup>[\[1\]](#note1)</sup>2. A custom data directory path can be specified with the `-datadir` option.3. All content of the data directory, except for `litecoin.conf` file, is chain-specific. This means the actual data directory paths for non-mainnet cases differ:Chain option | Data directory path-------------------------------|------------------------------`-chain=main` (default) | *path_to_datadir*`/``-chain=test` or `-testnet` | *path_to_datadir*`/testnet3/``-chain=signet` or `-signet` | *path_to_datadir*`/signet/``-chain=regtest` or `-regtest` | *path_to_datadir*`/regtest/`## Data directory layoutSubdirectory | File(s) | Description-------------------|-----------------------|------------`blocks/` | | Blocks directory; can be specified by `-blocksdir` option (except for `blocks/index/`)`blocks/index/` | LevelDB database | Block index; `-blocksdir` option does not affect this path`blocks/` | `blkNNNNN.dat`<sup>[\[2\]](#note2)</sup> | Actual Litecoin blocks (in network format, dumped in raw on disk, 128 MiB per file)`blocks/` | `revNNNNN.dat`<sup>[\[2\]](#note2)</sup> | Block undo data (custom format)`chainstate/` | LevelDB database | Blockchain state (a compact representation of all currently unspent transaction outputs (UTXOs) and metadata about the transactions they are from)`indexes/txindex/` | LevelDB database | Transaction index; *optional*, used if `-txindex=1``indexes/blockfilter/basic/db/` | LevelDB database | Blockfilter index LevelDB database for the basic filtertype; *optional*, used if `-blockfilterindex=basic``indexes/blockfilter/basic/` | `fltrNNNNN.dat`<sup>[\[2\]](#note2)</sup> | Blockfilter index filters for the basic filtertype; *optional*, used if `-blockfilterindex=basic``wallets/` | | [Contains wallets](#multi-wallet-environment); can be specified by `-walletdir` option; if `wallets/` subdirectory does not exist, wallets reside in the [data directory](#data-directory-location)`./` | `anchors.dat` | Anchor IP address database, created on shutdown and deleted at startup. Anchors are last known outgoing block-relay-only peers that are tried to re-connect to on startup`./` | `banlist.dat` | Stores the IPs/subnets of banned nodes`./` | `litecoin.conf` | User-defined [configuration settings](bitcoin-conf.md) for `litecoind` or `litecoin-qt`. File is not written to by the software and must be created manually. Path can be specified by `-conf` option`./` | `litecoind.pid` | Stores the process ID (PID) of `litecoind` or `litecoin-qt` while running; created at start and deleted on shutdown; can be specified by `-pid` option`./` | `debug.log` | Contains debug information and general logging generated by `litecoind` or `litecoin-qt`; can be specified by `-debuglogfile` option`./` | `fee_estimates.dat` | Stores statistics used to estimate minimum transaction fees and priorities required for confirmation`./` | `guisettings.ini.bak` | Backup of former [GUI settings](#gui-settings) after `-resetguisettings` option is used`./` | `ip_asn.map` | IP addresses to Autonomous System Numbers (ASNs) mapping used for bucketing of the peers; path can be specified with the `-asmap` option`./` | `mempool.dat` | Dump of the mempool's transactions`./` | `onion_v3_private_key` | Cached Tor onion service private key for `-listenonion` option`./` | `peers.dat` | Peer IP address database (custom format)`./` | `settings.json` | Read-write settings set through GUI or RPC interfaces, augmenting manual settings from [bitcoin.conf](bitcoin-conf.md). File is created automatically if read-write settings storage is not disabled with `-nosettings` option. Path can be specified with `-settings` option`./` | `.cookie` | Session RPC authentication cookie; if used, created at start and deleted on shutdown; can be specified by `-rpccookiefile` option`./` | `.lock` | Data directory lock file## Multi-wallet environmentWallets are Berkeley DB (BDB) or SQLite databases.1. Each user-defined wallet named "wallet_name" resides in the `wallets/wallet_name/` subdirectory.2. The default (unnamed) wallet resides in `wallets/` subdirectory; if the latter does not exist, the wallet resides in the data directory.3. A wallet database path can be specified with the `-wallet` option.4. `wallet.dat` files must not be shared across different node instances, as that can result in key-reuse and double-spends due the lack of synchronization between instances.5. Any copy or backup of the wallet should be done through a `backupwallet` call in order to update and lock the wallet, preventing any file corruption caused by updates during the copy.### Berkeley DB database based walletsSubdirectory | File(s) | Description-------------|-------------------|-------------`database/` | BDB logging files | Part of BDB environment; created at start and deleted on shutdown; a user *must keep it as safe* as personal wallet `wallet.dat``./` | `db.log` | BDB error file`./` | `wallet.dat` | Personal wallet (a BDB database) with keys and transactions`./` | `.walletlock` | BDB wallet lock file### SQLite database based walletsSubdirectory | File | Description-------------|----------------------|-------------`./` | `wallet.dat` | Personal wallet (a SQLite database) with keys and transactions`./` | `wallet.dat-journal` | SQLite Rollback Journal file for `wallet.dat`. Usually created at start and deleted on shutdown. A user *must keep it as safe* as the `wallet.dat` file.## GUI settings`litecoin-qt` uses [`QSettings`](https://doc.qt.io/qt-5/qsettings.html) class; this implies platform-specific [locations where application settings are stored](https://doc.qt.io/qt-5/qsettings.html#locations-where-application-settings-are-stored).## Legacy subdirectories and filesThese subdirectories and files are no longer used by the Litecoin Core:Path | Description | Repository notes---------------|-------------|-----------------`blktree/` | Blockchain index; replaced by `blocks/index/` in [0.8.0](https://github.com/litecoin-project/litecoin/blob/master/doc/release-notes/release-notes-0.8.0.md#improvements) | [PR #2231](https://github.com/bitcoin/bitcoin/pull/2231), [`8fdc94cc`](https://github.com/litecoin-project/litecoin/commit/8fdc94cc8f0341e96b1edb3a5b56811c0b20bd15)`coins/` | Unspent transaction output database; replaced by `chainstate/` in 0.8.0 | [PR #2231](https://github.com/bitcoin/bitcoin/pull/2231), [`8fdc94cc`](https://github.com/litecoin-project/litecoin/commit/8fdc94cc8f0341e96b1edb3a5b56811c0b20bd15)`blkindex.dat` | Blockchain index BDB database; replaced by {`chainstate/`, `blocks/index/`, `blocks/revNNNNN.dat`<sup>[\[2\]](#note2)</sup>} in 0.8.0 | [PR #1677](https://github.com/bitcoin/bitcoin/pull/1677)`blk000?.dat` | Block data (custom format, 2 GiB per file); replaced by `blocks/blkNNNNN.dat`<sup>[\[2\]](#note2)</sup> in 0.8.0 | [PR #1677](https://github.com/bitcoin/bitcoin/pull/1677)`addr.dat` | Peer IP address BDB database; replaced by `peers.dat` in [0.7.0](https://github.com/bitcoin/bitcoin/blob/master/doc/release-notes/release-notes-0.7.0.md) | [PR #1198](https://github.com/bitcoin/bitcoin/pull/1198), [`928d3a01`](https://github.com/bitcoin/bitcoin/commit/928d3a011cc66c7f907c4d053f674ea77dc611cc)`onion_private_key` | Cached Tor onion service private key for `-listenonion` option. Was used for Tor v2 services; replaced by `onion_v3_private_key` in [0.21.0](https://github.com/bitcoin/bitcoin/blob/master/doc/release-notes/release-notes-0.21.0.md) | [PR #19954](https://github.com/bitcoin/bitcoin/pull/19954)## Notes<a name="note1">1</a>. The `/` (slash, U+002F) is used as the platform-independent path component separator in this document.<a name="note2">2</a>. `NNNNN` matches `[0-9]{5}` regex.