Electrum Seed Phrase Reduce from 12 to 11. How Possible is it?

[nc50lc]

(it's not recommended to use it though)

Why is it not recommended to make use of the custom generated seed like the example you gave.

Because it's not following any standards.
Even though it's a valid Electrum seed, it's generated manually, not generated from a random entropy.

It's security isn't particularly bad specially if it consists of more characters and words,
So it's up to the user to decide, that's why my note is just "not recommended" and not "absolutely" do not use it.
Because people aren't good at randomness.

And would such a seed be considered as a custom electrum seed?

Hmm, Electrum's seed version system allows that but generates from a fixed word list by default.
So it's kind of a normal Electrum seed, but you can call it that if you want since there's no known term on Electrum seed generated from non-BIP39 word list.

[SilverCryptoBullet]

If OP still has access to the wallet on the old device, he can simply export the seed phrase and write it down again (this time, correctly).
There is no need to make a new wallet, if the only purpose is to have an electrum wallet that its seed phrase has been written down somewhere correctly.

I forgot about that step.

OP can click on the Wallet tab, then Seed, type a wallet password and get the wallet seed phrase. Then write it down correctly (this time) to use it as a back up for recovery in future.

[uche6215]

I don't like too much argument. I will pm some reputable members here with the screenshot of the seed phrase to them so they can also confirm it from their end. That was a seed phrase I have been using for some time. And just fow me to realize this recently. I was also confused till now. And Electrum wallet address is not like the previous address again. Before you can login to the wallet and see the same address at anytime but now as the wallet updated last year, they have 10 minutes, 1 day, and 1 week address and the I address I was using is not found in the wallet again.

I have sent the seed phrase to some reputable members here and you can confirm it but yourself.

[Charles-Tim]

I don't like too much argument. I will pm some reputable members here with the screenshot of the seed phrase to them so they can also confirm it from their end. That was a seed phrase I have been using for some time. And just fow me to realize this recently. I was also confused till now. And Electrum wallet address is not like the previous address again. Before you can login to the wallet and see the same address at anytime but now as the wallet updated last year, they have 10 minutes, 1 day, and 1 week address and the I address I was using is not found in the wallet again.

You have not being following this thread. Start reading from here: https://bitcointalk.org/index.php?topic=5502361.msg64303193#msg64303193

I have sent the seed phrase to some reputable members here and you can confirm it but yourself.

Know that if other people know about your seed phrase, the people can use that to spend your coins. I hope that seed phrase (that you sent us) do not have any addresses that are funded with bitcoin.

[promise444c5]

So the gist is: if any jargon you type as seed phrase produced a valid reserve number when passed through HMAC-SHA512 with the string "Seed version" as key.
It's a valid Electrum seed. (it's not recommended to use it though)

Thank you for the detailed explanation along with the examples....
I did try to give it a trial on my own using online available tool
I got this using the seed that generated the SegWit wallet I said earlier


The hash in the screenshot is not complete.... but that's the first three bytes with the 0x100 rserved number making it a Segwit(Electrum seed type).
It was absolutely great learning something new

[hosseinimr93]

I received a message containing the seed phrase from OP.
I entered the seed phrase on electrum and it was invalid. I replaced the word "staff" with "stuff" and it became valid, but the wallet was empty and there was no transaction history.

uche6215, now you should consider your wallet compromised. Don't send any fund to that.

[OmegaStarScream]

I received a message containing the seed phrase from OP.
I entered the seed phrase on electrum and it was invalid. I replaced the word "staff" with "stuff" and it became valid, but the wallet was empty and there was no transaction history.

uche6215, now you should consider your wallet compromised. Don't send any fund to that.

Same thing here. I have received a message from OP containing the seedphrase. I haven't tried replacing any words, and it was invalid.

As mentioned above @uche6215. A seedphrase is not something you should be sharing with anyone. Whether you manage to access the wallet or not, you should stop using it, and create a new one.

[nc50lc]

I have sent the seed phrase to some reputable members here and you can confirm it but yourself.

First of all, the explanation why 11 out of 12 of the words are valid isn't because your seed phrase has changed.
I already explained it in detail that it could happen if the computed version number is valid.

Secondly, sending it to multiple person was dangerous, you could've at least messaged each first so you can get a public key to encrypt your PM containing the seed phrase.

Thirdly, about the seed phrase; there are two iterations that can make it a valid Electrum seed but all are empty.
Namely: hosseinimr93's findings about changing "staff" to "stuff" (SegWit) and separately, "teach" to "teacher" (Standard).
If you're using a passphrase (if you ticked "Extension this seed with custom words"), try those two "corrected" seed phrases with your passphrase.
(do not share the passphrase to us)

I also tried to use "BIP39 seed" option in case you've used it to generate a wallet with different script type
as I've seen some reckless tutorials instructing users to do that to create nested-SegWit wallet.
But all options are empty as well.

Lastly, Electrum allows the creation of multiple wallets.
You might have created a wallet with that seed phrase first (created that paper backup) then created new wallets that you actually used but never backed up the seed.

[hosseinimr93]

Namely: hosseinimr93's findings about changing "staff" to "stuff" (SegWit) and separately, "teach" to "teacher" (Standard).

The correct seed phrase should be the one that works with changing the word "staff" to "stuff" and OP didn't use any passphrase.
The seed phrase containing the word "stuff" generates the address bc1q.........f0l6u which has already been posted by OP when applying for signature campaigns.

[uche6215]

Namely: hosseinimr93's findings about changing "staff" to "stuff" (SegWit) and separately, "teach" to "teacher" (Standard).

The correct seed phrase should be the one that works with changing the word "staff" to "stuff" and OP didn't use any passphrase.
The seed phrase containing the word "stuff" generates the address bc1q.........f0l6u which has already been posted by OP when applying for signature campaigns.

Thanks everyone. I will not use that wallet again. I will create new address.

[nc50lc]

Thanks everyone. I will not use that wallet again. I will create new address.

The issue isn't the address, it's the whole wallet that's associated with the seed phrase that you've exposed.
What you need to do is to create another wallet using a newly generated seed phrase.

You may create a backup of that existing wallet where the said address belongs, then delete the original copy from "electrum/wallets" so you wont accidentally use it to receive bitcoins.