* 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
