Bitcoin & Python Code

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Some websites have a sign-in feature where you digitally sign a message with your node & they automatically know who you are. (Amboss for example) Does anyone have any sample code or github links to code that does the signing & verification? Some wallets have this same feature, which appears to use one address. I presume this is different from the node-based signing. Any code available to do this address-based signing? I’m writing something in python & could use a pointer or two.