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Thank you for the quick reply. I attached the entire conversation:

Me

Dear Voltz team,
I am having an issue, that I can't access any more the ca 20.000 sats I had deposited on the cashu mint mint.lnvoltz.com.
The first time I noticed this issue was on Thursday, the 12.12.2024, when I tried to make a lightning payment and if failed. I am using the Minibits wallet. Since then, whenever I tried to send money from the mint, I was getting the error "Invalid Keyset". Today I tried to reset my wallet and recover the cashu tokens from the seed, but it doesn't find any tokens. With the other mints I had it worked.
Did you notice any issues from your side, that could have caused this disruption?
Thanks and best regards

Voltz

Hello, yes we are aware that some customers would have problems after we disabled this vulnerable Keyset. You can call me on Telegram t.me/EM_TLL to resolve it faster. I will help you provide me with your ecashs of your back-up only, from voltz mint.
With this, we will burn manually in our database and send you the funds returned by Lightning. All right for you? I say it, because we cannot reactivate Keyset due to its vulnerability.
So... I look forward to you on Telegram, until then!

Me

Thank you for the quick reply,
I have been having some issues with my telegram account recently, so I will try to give you the info through here:
Because I reset my wallet today, assuming it was a wallet issue, I don't have the actual key values or their backups. The only thing I have is the original seed of the minibits wallet. Since, I have emptied the wallet otherwise, I am fine in providing it here:
<provides wallet seed>
I hope, that it is possible to restore the funds with this seed. Please send the recovered funds to this lightning address:
<provides lightning address>
Thanks and best regards

Voltz

Perhaps with SEED alone it is not possible to recover the secrets and signatures of Ecash. Are you sure you don't have any backup files? in this file contains all the secrets and signatures of the Mint that serve to burn in the database. Similarly, I will try to recover by the seeds and see if something appears. I will contact you as soon as you test.

Me

Yes, unfortunately, even the backup creation was not working, it was giving similar keyset errors. But the seed alone should also be enough. After the reset I was able to recover just with the seed the funds of the 2 others mints I had together with Voltz. I don't know the details of how it works, but I think it has some kind of function, where it goes deterministically through all possible ecash values based on the seed and checks which ones actually exist.

Voltz

Hello!
I have recovered the seed from your wallet several times but no funds have appeared. I needed the backup file with the secrets and signatures to manually check the database, add up the balance, burn the ecash bills and return the remaining balance to you via lightning invoice.
Are you sure you don't have this file?

Me

Hello!
yes, 100% sure I dont have it. I was not able to create it due to the keyset error, before I made the reset.
I dont know the technical details, but I assume that the seed based recovery queries the server for all possible secrets until it finds the existing ones. So if the keysets are disabled due to vulnerability, it doesnt find anything. For this reason it recovered the funds for the other 2 mints but didnt find anything for voltz.
Is it possible to temporary reenable the keyset to make the recovery and then disable it again? Or maybe create an offline copy of the database and perform the recovery with that?
Thanks and best regards
---Ne reply after that---
You see? Your lack of understanding how ecash works made you to lose funds and not Voltz. You are talking about Minibits app seed. That seed IT IS NOT LINKED to another mint that is not minibits. The seed is only for Minibits app.
In Minibits you have the option to backup the tokens, that RESIDE on your device and nowhere else. Voltz cannot recover your ecash tokens from Minibits app. If you erase those tokens, are gone.
The only thing Voltz can do is to dig up into your account and see the LN movements and do the math for the remaining balance and give you those sats.
Please understand that the sats are already on Voltz node, but you were playing around only with a bunch of IOUs ecash tokens.
Think about this: Voltz gave you some gift cards and you burn them. Now you complain to give you back the value of those burned gift cards. You are making them responsible for your own actions... that is not fair.
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You see? Your lack of understanding how ecash works made you to lose funds and not Voltz. You are talking about Minibits app seed. That seed IT IS NOT LINKED to another mint that is not minibits. The seed is only for Minibits app.
In Minibits you have the option to backup the tokens, that RESIDE on your device and nowhere else. Voltz cannot recover your ecash tokens from Minibits app. If you erase those tokens, are gone.
The only thing Voltz can do is to dig up into your account and see the LN movements and do the math for the remaining balance and give you those sats.
Please understand that the sats are already on Voltz node, but you were playing around only with a bunch of IOUs ecash tokens.
Think about this: Voltz gave you some gift cards and you burn them. Now you complain to give you back the value of those burned gift cards. You are making them responsible for your own actions... that is not fair.
Sorry, but I have to disagree here. It is true, that the created Cashu tokens are stored on the Minibits wallet. But it is also true, that the cashu Protocol provides a function, where with the seed the wallet can restore all tokens of a specific mint. Actually I had 3 different mints on that Minibits wallet, Voltz, Minibits Mint and Coinos Mint. And the tokens for minibits and Coinos get both restored just with the seed after I reset my wallet. Just for Voltz not, because they disabled my tokens.
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20 sats \ 8 replies \ @ek 9 Feb
Are you sure that a cashu seed is only for a single mint?
If I read NUT-13 right, it's a single seed for all mints. The mint only needs to support NUT-09.
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100 sats \ 1 reply \ @gandlaf21 22h
correct
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0 sats \ 0 replies \ @ek 22h
Thanks @gandlaf21!
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idk what nut is supported by voltz. I didn't played out with that mint.
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What I can say is, that I have also done the seed recovery with Voltz in the past and it used to work. Just now not, which probably is due to them disabling my funds.
I am quite confident that it is technically possible to find out which disabled keysets my seed hits, they just dont have the interest / technical competence to do this.
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200 sats \ 3 replies \ @gandlaf21 22h
I just checked, and the mint supports restore. They should be able to, unless they already purged the data for this keyset. which would be very premature.
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20 sats \ 2 replies \ @ek 22h
I think they didn't purge it but they don't want to reactivate the keyset because of a vulnerability:
Hello, yes we are aware that some customers would have problems after we disabled this vulnerable Keyset. You can call me on Telegram t.me/EM_TLL to resolve it faster. I will help you provide me with your ecashs of your back-up only, from voltz mint.
With this, we will burn manually in our database and send you the funds returned by Lightning. All right for you? I say it, because we cannot reactivate Keyset due to its vulnerability.
Do you know what vulnerability this could be? Could it be that they accidentally minted too much ecash with this keyset?
0 sats \ 3 replies \ @ek 9 Feb
when was your last reply?
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On 13 January I sent them the last message, I posted of the conversation, to which I got no reply. Then on 25 January I sent a follow up message, asking if they have any news here, to which again I got no reply. So now I ended up here. Before that they were quick and replied within a day.
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1000 sats \ 1 reply \ @ek 9 Feb
I see, weird. I shared your post in the cashu r&d telegram group.
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Thank you for the support!
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