- zcash.conf: contains configuration settings for zcashd
- zcashd.pid: stores the process id of zcashd while running
- 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)
- database/*: BDB database environment
- db.log: wallet database log file
- debug.log: contains debug information and general logging generated by zcashd
- fee_estimates.dat: stores statistics used to estimate minimum transaction fees and priorities required for confirmation
- peers.dat: peer IP address database (custom format)
- wallet.dat: personal wallet (BDB) with keys and transactions