* banlist.dat: stores the IPs/Subnets of banned nodes
* blocks/blk000??.dat: block data (custom, 128 MiB per file)
* blocks/rev000??.dat; block undo data (custom)
* blocks/index/*; block index (LevelDB)
* chainstate/*; block chain state database (LevelDB)
* dash.conf: contains configuration settings for dashd or dash-qt
* dashd.pid: stores the process id of dashd while running
* database/*: BDB database environment; only used for wallet; 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 dashd or dash-qt
* evodb/*: special txes and quorums database
* fee_estimates.dat: stores statistics used to estimate minimum transaction fees and priorities required for confirmation
* governance.dat: stores data for governance objects
* indexes/txindex/*: optional transaction index database (LevelDB); since 0.17.0
* llmq/*: quorum signatures database
* mempool.dat: dump of the mempool's transactions
* mncache.dat: stores data for masternode list
* netfulfilled.dat: stores data about recently made network requests
* peers.dat: peer IP address database (custom format)
* 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)
* onion_v3_private_key: cached Tor hidden service private key for `-listenonion`
* guisettings.ini.bak: backup of former GUI settings after `-resetguisettings` is used