Curious Question

[HCP]

This makes sense now. Well let's not make it too hard. We always have option to deal with the HD wallet. I don't think anyone need to access only a single public key when it's x to y multi-sig wallet.

The only time I've had this requirement was when trying to "rescue" fork coins from Electrum MultiSig and/or 2FA wallets, for which a "forked" version of Electrum supporting MultiSig and/or 2FA was not available... and that hasn't really been an issue for years now.

But basically, it involved taking the master keys... identifying the individual private keys that matched the addresses with UTXOs... then essentially recreating the multisig in the "Core" wallet for the particular chain.

It's not impossible to do... it's just a real PITA and requires quite a bit of manual work/console stuff with raw transactions etc. (not to mention having to sync/maintain multiple chains )

[pooya87]

~

This makes sense now. Well let's not make it too hard. We always have option to deal with the HD wallet. I don't think anyone need to access only a single public key when it's x to y multi-sig wallet.

Yeah you don't need to work with a single public key if it was used in a multi-sig scheme since that would be useless, but also unfortunately importing a lone multi-sig address with having all the keys is not an available option in Electrum. An old open issue tracks this but hasn't been solved yet.

[BitcoinGirl.Club]

It's not impossible to do... it's just a real PITA and requires quite a bit of manual work/console stuff with raw transactions etc. (not to mention having to sync/maintain multiple chains )

I had extracting fork coin thing in mind but then realized who care about few shitcoins LOL. I prefer long-term hold in an x by y multi-sig wallet.

An old open issue tracks this but hasn't been solved yet.

I think the answer is here which you already talked about.

[Kakmakr]

Thanks for all the replies.

I tend to make backups of all private keys on a air gapped computer and store them on memory cards that will only ever see the light of day in an emergency should I have issues with wallet software and can't resolve issues via the seed words.  Just call me paranoid.

So from what I gather electrum or other software will allow the recreation of a multisig wallet via the use of both "master private keys" as long as the wallet is a 2 of 2 setup and no more.  

Thank you.

SD standards-based memory cards, like most semiconductor cards, store information in flash memory. The current technology along with normal usage typically gives the card a lifespan of 10 years or more, allowing consumers to upgrade their devices for many years and reduce consumer electronic waste. Source : https://www.sdcard.org/consumers/faq/

So you should replace your memory cards and move the data onto the new memory cards to protect that data. Some people are saying these cards only hold the data for about 5 years.  

[nc50lc]

-snip-

SD standards-based memory cards, like most semiconductor cards, store information in flash memory. The current technology along with normal usage typically gives the card a lifespan of 10 years or more, allowing consumers to upgrade their devices for many years and reduce consumer electronic waste. Source : https://www.sdcard.org/consumers/faq/

I believe the statement "along with normal usage" indicates that it's based from a scenario when the flash drive is constantly being used to delete & copy files.
For cold storage purposes, the flash drive wont even be used so it wont "write" any more data so it should last longer than that.
For example, I have a dormant USB2.0 thumb drive from 9 years ago and the contents are still intact time I tried, guess it will be broken by the next year :D

Of course having multiple backup in different portable drives as a failsafe is recommended.

[HCP]

For example, I have a dormant USB2.0 thumb drive from 9 years ago and the contents are still intact time I tried, guess it will be broken by the next year

I would have thought that having it unpowered for extended periods of time might be tempting "bit rot" in a flash memory based device. This article, although it is specifically talking about SSDs, suggests exactly that: https://www.techadvisor.com/how-to/storage/bit-rot-slow-death-of-hard-drives-ssds-3796137/

Although your message implies you may have plugged it in occasionally?

[nc50lc]

-snip-
Although your message implies you may have plugged it in occasionally?

Yes but not-quite-occasionally,
I've been plugging it once or twice a year to check the contents for possible corruption.

[HCP]

I've been plugging it once or twice a year to check the contents for possible corruption.

That would probably be more than enough then... as most of the articles I've read (granted none were written within the last 2 years) would indicate that once or twice a year should be enough to keep the "bit rot" at bay

I have one or two SD cards that I'm fairly sure hadn't been plugged into anything or powered up in any way for a couple of years (sitting in storage) and they were "OK"... not sure I'd do the same for crypto backup storage tho