Nostr Web Client

Technical question re BIP85

The index number derives a child key - could this be done with a passphrase instead of an index though (ala BIP39 passphrase)?

Ie instead of Index: 1234567890

Passphrase: One23456789-Zero

Usecase would be similar in that one seed rules them all, but instead of an up to 10-digit number which could be bruteforced, I could give a child wallet to someone and protect the master seed for them but I couldn’t get to their child seed as they’d have a master password which I couldn’t bruteforce?

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Discussion

Sound Money 2y ago

I'd test with a coldcard to see if possible. Based on how the passphrase works with the coldcard UI, I think it would work.

I think the risk of a loved one trusting you pales in comparison to them forgetting the passphrase.

Steven Day 2y ago

I think I know what you are saying.

I use multiple passphrase off of a 24 word seed.

Totally not deterministic so you can’t derive any of the either addresses or keys from each 24 word + passphrase.

Steven Day 2y ago

On the cold card you can enter in or remove passphrase to set up signing from that configuration.

Would also recommend keeping the “blank” (mnemonic) passphrase with some duress sats maybe.