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Filename | Description
--------------------|----------------------------------------------------------------------------------------------------------------------------
banlist.dat | stores the IPs/Subnets of banned nodes
bitcoin.conf | contains configuration settings for bitcoind or bitcoin-qt
bitcoind.pid | stores the process id of bitcoind while running
blocks/blk000??.dat | block data (custom, 128 MiB per file); since 0.8.0
blocks/rev000??.dat | block undo data (custom); since 0.8.0 (format changed since pre-0.8)
blocks/index/* | block index (LevelDB); since 0.8.0
chainstate/* | blockchain state database (LevelDB); since 0.8.0
database/* | BDB database environment; only used for wallet since 0.8.0; moved to wallets/ directory on new installs since 0.16.0
db.log | wallet database log file; moved to wallets/ directory on new installs since 0.16.0
debug.log | contains debug information and general logging generated by bitcoind or bitcoin-qt
fee_estimates.dat | stores statistics used to estimate minimum transaction fees and priorities required for confirmation; since 0.10.0
indexes/txindex/* | optional transaction index database (LevelDB); since 0.17.0
mempool.dat | dump of the mempool's transactions; since 0.14.0
peers.dat | peer IP address database (custom format); since 0.7.0
wallet.dat | personal wallet (BDB) with keys and transactions; moved to wallets/ directory on new installs since 0.16.0
wallets/database/* | BDB database environment; used for wallets since 0.16.0
wallets/db.log | wallet database log file; since 0.16.0
wallets/wallet.dat | personal wallet (BDB) with keys and transactions; since 0.16.0
.cookie | session RPC authentication cookie (written at start when cookie authentication is used, deleted on shutdown): since 0.12.0
onion_private_key | cached Tor hidden service private key for `-listenonion`: since 0.12.0
guisettings.ini.bak | backup of former GUI settings after `-resetguisettings` is used
Only used in pre-0.8.0
---------------------
* blktree/*; block chain index (LevelDB); since pre-0.8, replaced by blocks/index/* in 0.8.0
* coins/*; unspent transaction output database (LevelDB); since pre-0.8, replaced by chainstate/* in 0.8.0
Only used before 0.8.0
---------------------
* blkindex.dat: block chain index database (BDB); replaced by {chainstate/*,blocks/index/*,blocks/rev000??.dat} in 0.8.0
* blk000?.dat: block data (custom, 2 GiB per file); replaced by blocks/blk000??.dat in 0.8.0
Only used before 0.7.0
---------------------
* addr.dat: peer IP address database (BDB); replaced by peers.dat in 0.7.0
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