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  • banlist.dat: stores the IPs/Subnets of banned nodes
  • bitcoingold.conf: contains configuration settings for bgoldd 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/*; block chain 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