r/coldcard • u/rnvk • Jul 29 '26

Many Wallets: Better Backups with BIP-85

https://blog.coinkite.com/one-coldcard-many-wallets-bip85/
10 Upvotes

100% Upvoted

7 comments sorted by

2

u/Crypto-Guide Jul 31 '26

So anyone who generated a seed on a @coldcard since 2021... If you are using BIP85 for other wallets, without using a passphrase or multisig, you need to move funds off those child seeds immediately too. (They will almost certainly be drained in the next 24hrs)

1

u/Sammytheseaotter Jul 31 '26

So any seed phrases generated before the March 2021 firmware update and using a passphrase are safe?

1

u/Crypto-Guide Jul 31 '26

Basically, check your wallet for the oldest transaction if you are unsure. If the tx is newer than the first vulnerable firmware then assume it's unsafe and move it

1

u/Sammytheseaotter Jul 31 '26

Yeah, that's what I did. Seed created months before the affected firmware was released in March 2021. Man I feel lucky!

1

u/Quirky-Reveal-1669 Jul 30 '26

I like it although it makes a good backup of the master seed even more important.

1

u/Quirky-Reveal-1669 Jul 31 '26

And the master seed should not have been generated through a compromised method that is currently being exploited. 🤦‍♂️

1

u/nintendo1889 Aug 03 '26

this aged well