python-mnemonic VS gokey

Yes. BIP39 defines a check word to ensure the previous words are correct. You can read the spec here: https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki

ColdCard follows the BIP-39 standard for encoding the wallet's seed as a series of 24 words (a.k.a. "seed menmonic", sometimes called a recovery phrase). If you followed the instructions you were given when initializing it and you've stored your seed mnemonic safely in the real world (not digitally where it can be more easily discovered), you're fine. In the event you lose or damage your ColdCard, you can initialize a new wallet--ANY wallet that follows the BIP-39 standard, which is pretty universal these days--and the wallet will regenerate the same private keysthat your original ColdCard did, in the same order.

... and BIP-39

Look-up "BIP32", "BIP39" and "BIP44", those will point you to documents describing precisely how seed phrases are converted into crypto keys.

i think bip39 is what you want to look up.

Not correct See this: https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki

$ go get github.com/cloudflare/gokey

GoKey – A simple vaultless password manager in Go\ (2 comments)

I got the idea from https://github.com/cloudflare/gokey

> gokey is a password manager, which does not require a password vault. Instead of storing your passwords in a vault it derives your password on the fly from your master password and supplied realm string (for example, resource URL). This way you do not have to manage, backup or sync your password vault (or trust its management to a third party) as your passwords are available immediately anywhere.

Instead of having to install a binary on your computer I thought it would be nice to have a web-based utility. Everything is done in your browser, so nothing is sent to any other servers to process the request.

I'm definitely open to criticism, feedback, suggestions, etc..