(I advise you to stop using that seed after that and create a new one from your Electrum wallet).

What said in that article is wrong.
Any UTXO you have is spendable, however sometimes it's not worth it to spend them.
If trustwallet doesn't allow you to spend a UTXO, it doesn't mean that's not spendable. You can import your key to another wallet and spend them.


Assume that you have received two bitcoin transactions. In one of them you received 0.01 BTC and in the other one you received 0.00001 BTC.
Now you have two UTXOs. UTXO A is worth 0.01 BTC and UTXO B is worth 0.00001. You are going to make a bitcoin transaction with the fee rate of 50 sat/vbyte sending the fund to a single address.

If you make a transaction using UTXO A and without using UTXO B, your transaction fee would be around 5600 satoshi.
If you add UTXO B to your transaction, the fee would increase to around 8900 satoshi. This means that if you add UTXO B to your transaction, you increase the fee by 3300 satoshi, while UTXO B is worth only 1000 satoshi. So, it's not worth it to spend UTXO B now and for spending that, you should wait until fees decrease. This doesn't mean you can't spend UTXO B now.

You should get dust error when your transaction creates an output worth less than the dust limit.
The dust limit is 546 satoshi for legacy addresses and 294 satoshi for native segwit addresses.


Don't use turstwallet and go for a trustworthy open-source wallet that supports coin control.

No, your wallet hasn't been compromised. It depends on what you're trying to do, but I usually just decrease the amount I'm trying to send by a little bit, and it goes through just fine. There are multiple reasons on why you're seeing the error though:

https://community.trustwallet.com/t/unable-to-send-due-to-dust-error/1188

With Bitcoin (BTC) 5.0k and other so-called UTXO-based coins, small amounts of UTXOs can accumulate (as the result of change from earlier sent payments), which, combined with higher fees, may result in a portion of balance impossible to spend.

Thanks I think I understand better now from your explanation. I noticed some mixers also use CoinJoin and others do not. Is CoinJoin a criteria to determine which is the best mixer to use?

I don't think I used the term wrong, I got the term "unused address" from Electrum. The wallet has about 20 receiving addresses you can use, that's what I mean.
Is there such thing as a privacy wallet? If there is, please list some of those. I would like to hear what others think of this. Also how's it possible to get the IP address of the wallet owner?