If the RPC interface is how you talk to your Bitcoin node, bitcoin.conf is how you shape it — the settings file that decides how much disk it uses, how it reaches the network, and who is allowed to command it. This reference covers the options a node operator and solo miner actually sets, grouped by purpose, with each description drawn from Bitcoin Core’s own built-in help text. It is a working subset, not the full option list; confirm exact defaults for your release with bitcoind -help.

The file itself is plain text: one setting=value per line, comments start with #, and it lives in your data directory (~/.bitcoin/bitcoin.conf on Linux, %APPDATA%Bitcoinbitcoin.conf on Windows, ~/Library/Application Support/Bitcoin/bitcoin.conf on macOS). Any command-line flag except -conf itself can also go in the file.

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