Quote from: Forsyth Jones on July 23, 2025, 09:56:42 PM

So it's clear that the PSBT contains the necessary instructions for the master private key (in offline Electrum) where to derive the key (witch the index number is).

The cryptography is impressive!

Interestingly, I put the psbt from my testnet transaction into https://bip174.org/# and not only did it give me the input address path (ie. m/0'/0/39) but also the output address paths (m/0'/1/1 and m/0'/0/59, sending tBTC into address 59 in the same wallet). This surprises me, as I wouldn't think that would be the way it works. The partially signed transaction already has the output address, and only needs the signing wallet to look up the private key corresponding to the input, right?

Quote from: Forsyth Jones on July 23, 2025, 09:56:42 PM

Fun fact 2: In addition to Electrum and Bluewallet (which can restore Electrum seeds and passphrases), there is another way to restore access to the private keys of a native Electrum wallet. See this post: https://bitcointalk.org/index.php?topic=5265935.0
https://bitcointalk.org/index.php?topic=2373020.msg24316954#msg24316954 - @HCP's reply, he was one of the first members to help me. I hope you're doing well.

Thanks for the link to those threads. Now I have some idea what is going on specifically with Electrum, in addition to what I have learned about the key generation process in general from reading the internet and ignoring the AI summaries.

[EDIT] For anyone reading this and wanting a independent way to generate electrum address from seed and passphrase, this tool https://github.com/FarCanary/ElectrumSeedTester which can be found in the thread noted above is fabulous.