There is no problem with doing that.
You can have as many as wallet you want in a single device.
Just take note that if you have downloaded the blockchain in pruned mode, you have to redownload it every time you import a new wallet.dat file.

If electrum is used properly is secure enough.
For example, if you install electrum on a device which has been infected with a malware or someone has access to your keys, you can lose your bitcoin. This applies to bitcoin core as well.

If you want your electrum wallet to be completely secure, it should be created on an air-gapped device. Otherwise, there's always the risk of getting hacked. Whether it's electrum or it's bitcoin core.

So, it's possible that you have bitcoin in your change address(es).
In one of your previous posts, you said that you imported private keys of your receiving addresses. That's probably why you didn't get the correct balance on electrum. You missed change addresses.


Yes, you can create as many as wallets you want. Nothing stops you from doing that.

Yes. Just take note that the first word (abandon) represents 00000000000 and the second word (ability) represents 00000000001.


If you are familiar with python programming, you can use hashlib library.

The answer depends on what you are trying to achieve.

If you use bitcoin core and run your own node, you would have more privacy. With using bitcoin core, you can also help the network with validating transactions and blocks and keeping a copy of the blockchain.
The downside is that you need to download a very big size of data.

If you don't care about your privacy that much and you don't have any problem with connecting to servers owned by third parties, you don't need bitcoin core.
You can use a hardware wallet. It's much easier than using bitcoin core.

Electrum is surely one of the best bitcoin wallets.
It's open-source and gives you full access to your private keys.

Warning:
Download electrum only from its official website and do not forget to verify your download.

If you don't know which of them are funded and which of them are empty, you can import all the private keys.


You didn't answer the question I asked in my previous post.

Have you ever made any transaction with your wallet?
If no, there is no need to import private key of change addresses. All of them are empty.
If yes, you can check those transactions in a block explorer, find the change address and import their private keys into electrum.

I fully understand what you are trying to achieve.


If you select 12 words, there's a big probability that your seed phrase doesn't pass the checksum.
Instead, you can select 11 words and then try to find a word which lead to a valid BIP39 seed phrase. By valid, I mean it passes the checksum
This is completely feasible, but it's not a common method for generating a seed phrase.
If you insist on generating your seed phrase in this way, you should make sure that the words are picked 100% random.

For generating a BIP39 seed phrase, I would start with a random 128 bit entropy instead of directly going to the word list.

This is not true.
The checksum isn't the last word. The checksum is the last 4 bits.
Each of words include 11 bits. The first 7 bits of the last word have been generated randomly and its last 4 bits are the checksum.
So, if you have 11 word, for selecting the 12th word, you have to test different words until you find a valid word. As I already said in my previous post, 128 out of the 2048 words will lead to valid BIP39 seed phrase.

You have 11 words and you want to select the 12th word, so the BIP39 seed phrase passes the checksum. Am I right?

If I have understood you correctly, first of all note that that's not how a BIP39 seed phrase is generated.
It's not that 11 words are generated and then the 12th word is selected. Instead you generate a random number and your seed phrase represents that number. Your seed phrase provides 128 bits of entropy and 4 bits are added as the checksum.

Anyway, if you have the first 11 words and you want to have valid BIP39 seed phrase, there are 8 words that can be used as the 12th word.
To find that word, you should use brute-force method. This means that you should test all the 2048 words one by one.

The post has been edited. Thanks  o_e_l_e_o for the correction.

Have you ever made any transaction in bitcoin core?
If you have done so, it's possible that the missing fund is on your change address(es).

Take note that if you make a transaction in bitcoin core, the remaining balance goes to a new address called change address. If that's the case, you need to import the private key of the change address into electrum.

Non-custodial wallets don't charge any fee for the transactions. So, it doesn't make sense to say that I select a wallet with low fee. You should use a wallet which allow you to set the fee and estimate the required fee rate well. Your suggestion (electrum) is surely a good option.

This is true, but take note that being non-custodial isn't enough. You should use a non-custodial and open-source wallet.
If the wallet isn't open source, you don't know how the keys have been generated and whether you are the only one who has access to the keys or not.
For example, trustwallet is a non-custodial wallet, but since it's close source, I wouldn't recommend it.

Are you sure about trading limit of 1400 dollar on kucoin? I made a search and couldn't find any official announcement.
Even if there's such a limit, it should be for trading cryptocurrencies with fiat and I don't think there's any limit for trading cryptocurrencies with cryptocurrencies.

OP is not able to make transaction from his/her wallet.
According to this post, the wallet he/she is talking about is watch-only.

To OP:
If it was possible to export the seed phrase from a watch-only wallet, then it wouldn't be watch-only.

I just searched for the website in question and read some reviews.
According to one of reviews I read on scamadviser, the victim was contacted through a messaging app and was introduced to that website.
Most probably, the same thing happened to OP.

I don't really understand your purpose from creating this thread.
Every day, there are many people making bet on different casinos. Should they create a new topic every time they win a bet?

If you used the link provided on the email, did you check if you are in the real website?
If yes, can you tell us what exchange are you talking about?
It's possible that the exchange is a scam and they ask you to deposit some fund to be able to make a withdrawal.

From my experience, the number shown in "Premium section" isn't always correct and it usually takes some time to be updated.
It's also possible that you don't see any message regarding available WOF spins, while you have some spins.

Take note that you can play your WOF spins, even if you don't see that message. To do so, click the following link.
https://freebitco.in/static/html/wof/wof-premium.html

Thanks for the great explanation.
So, it seems that there were (at least) two people with access to OP's wallet.
Both used an automated program to steal OP's fund and the one who made transaction B was luckier than the one who made transaction A.

It depends on whether the full blockchain has been stored on the hard drive or not.
If the blockchain has been downloaded in prune mode, you have to download the blockchain again.