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In bitcoin.conf, if the rpcuser/rpcpassword is specified, I can access the RPC via curl like this:

curl --data-binary '{"jsonrpc": "1.0", "id": "test", "method": "getblockchaininfo", "params": []}'  http://user:[email protected]:8332/

Now that the rpcuser/rpcpassword option has been deprecated in favor of the new rpcauth option:

rpcauth=user:3f7c53e8c31facfaabbccf7bc4c02775$4f81f1a9c46a366d55bdf2f94ad7ddeeaa8d37cab0942430f2beffc7aca5d916

How can the rpcauth string be used to authenticate curl access?

Thank you.

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You can't, that's the point.

The rpcauth string is generated by the rpcauth tool, and contains a hash of your password. You authenticate exactly the same way: by providing the username and password. But you can't go back from rpcauth string to password.

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  • BTW, in Bitcoin Core v25, there is bitcoin.conf file attached that contains commented out all options, among them there are # Password for JSON-RPC connections #rpcpassword=<pw> (...) # Username for JSON-RPC connections #rpcuser=<user> Why are those there if they are deprecated?
    – streamofstars
    Jul 16 at 19:47

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