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