Quote from: Abdussamad on September 26, 2019, 03:02:50 PM

When originally creating the wallet did you extend the seed with custom words?

Has already been asked:

Quote from: bob123 on September 25, 2019, 11:12:22 PM

Or did you use an additional "25th word" a.k.a. a passphrase ?

and answered:

Quote from: AndrRoos on September 26, 2019, 10:06:38 AM

I didn't use any additional phrases!

Quote from: AndrRoos on September 26, 2019, 04:07:26 PM

you guys asked for the address. I posted earlier - BTC address; transaction ID; public key.

Unfortunately i couldn't find out anything related.
The address is completely unused except for this one transaction, which makes it quite unlikely that you were infected by some clipping board malware (still possible tho).
But as far as i know, the creator of such a malware are some retarded script kiddies who can't even iterate through a list properly. Therefore i tend to say this was not the case.

Quote from: AndrRoos on September 26, 2019, 03:55:28 PM

If I'm not mistaking, I recovered with the same seed that ''lost'' address once.

If this really is the case, then you still should be able to somehow access your coins.

But as bitmover pointed out, some (at least 1) of your statements must be wrong.

Could you please answer the following questions (again, just to be sure):

Where did you initially generate your seed (electrum on tails?)
Where did you download electrum from? And how did you do it? Did you verify the pgp signature ?
Do your current wallets addresses (on tails) indeed start with 1.. ?
Did you check whether you can copy a random BTC address (preferably starting with 1..) and paste it anywhere without it being tampered with (on your online machine) ?
Your first (small) transaction is also not visible in your tails wallet, correct ?
Did you change any options in electrum? Did you generate a multisig or 2FA wallet ?

I know that these questions are redundant, but something isn't right and we have to figure out what.