Post
Topic
Board Development & Technical Discussion
Merits 1 from 1 user
Re: How to backup multiple seeds derived from one: BIP-85
by
Forsyth Jones
on 19/02/2025, 23:45:37 UTC
⭐ Merited by JayJuanGee (1)
If I got it right what is meant here is the ability of device  to generate the child seed from master SEED extended by passphrase, If this correct then  Passport batch 2  also supports BIP-85 Passwords being the owner of this device I say this for certain. I utilize this feature to generate on passport 2 the child SEED for my Tangem 2 which is  used by me for on-the-go activity.
I thought only coldcard and seed.tools supported BIP-85 passwords, so Passport2 also has this feature? That’s great to know! I couldn’t find anything about them announcing support for this feature.

I know it's deterministic, and that's great, but I prefer using the text from 12 word child seeds as passphrases instead.

Imagine trying to write this down, by hand:
AwMJYOqM+ibwWt/s4BCcH

Now, imagine writing this:
core private bacon derive phone soon baby gun main local bench you

I love the simplicity of 12 words as easily readable text.
However, there are services that will require you to register your passwords with specific criteria: lowercase and uppercase letters, special characters, and so on... In that case, what do you do? I use KeepassXC or Keepass2 to manage that for me.

If I go to the bitcoinhole website and I filter based on deterministic entropy (BIP-85) (on the top left and in the private keys portion), the site shows HW wallets supporting BIP85 to be: Jade, Jade Plus, Coldcard Mk4, Coldcard Q, Passport Batch 2, Passport Prime (not yet released), Bitbox02, SeedSigner, Specter DIY and Krux.

All of these support BIP-85 for generating child seeds, but not for BIP-85 passwords like this set: KE2F23IB4STme9Xdx+5in.



However, as satscraper and Meuserna mentioned, it seems that both Krux and Passport2 also provide support for BIP-85 passwd.

If I got it right what is meant here is the ability of device  to generate the child seed from master SEED extended by passphrase, If this correct then  Passport batch 2  also supports BIP-85 Passwords being the owner of this device I say this for certain. I utilize this feature to generate on passport 2 the child SEED for my Tangem 2 which is  used by me for on-the-go activity.



Krux supports BIP85 Base64 passwords too, but I don't use that feature.  I only use BIP85 Mnemonics.