# bootstrap(cookieFile:port:timeout:) Bootstrap the direct RPC bridge using cookie authentication. ``` static func bootstrap(cookieFile: URL, port: UInt16 = 8332, timeout: Duration = .seconds(30)) async throws ``` ## Parameters `cookieFile` File URL to the `.cookie` file in the data directory. For non-mainnet networks, include the network subdirectory (e.g., `datadir/regtest/.cookie`). `port` RPC port (default 8332). `timeout` Maximum time to wait for the RPC server (default 30s). ## Discussion Reads the `.cookie` file written by Bitcoin Core at startup to obtain credentials, then calls `_bridge_init` via HTTP. This is the default, credential-free bootstrap mechanism. The cookie file is created during daemon startup with the format `__cookie__:`. This method polls for the file to appear, then uses it to authenticate the `_bridge_init` call. > Throws: The last transport or file-read error if the timeout expires, > or `CancellationError` if the task is cancelled.