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I need a python script to verify, in an air gapped system, that my 24-word (or 12-word) mnemonic seed indeed generates the xpub that my wallet is showing me.

Is there a simple script that does that, having minimal dependencies?

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Yes, I'd say the simplest way is to use python bip39 implementation of trezor, this one file should be enough with methods:

to_seed - to convert list of the words into seed and

to_hd_master_key - to generate master xpub/xpriv

It doesn't support further derivations (which require a bit more dependencies), for which I'd suggest using bip32 library.

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