Quote from: LoyceV on June 01, 2019, 08:03:59 AM

There has been a mixer that used dust transactions to advertise their service. If that's the case, a block explorer will probably give a hint if you look at the sending address.
It could indeed also be used for tracking, but only if you don't pay attention and let your wallet choose which inputs to use.

Quote from: vvic on June 01, 2019, 07:21:54 AM

I'm using bitcoin core wallet is there a way to mark these coins as bad? Or tell the wallet do not spend?

You can do this:
Click Settings > Options > Wallet > Enable coin control features.
Then, click Send > Inputs > right mouse button on a dust transaction > Lock unspent.

Or (after enabling coin control features):
When you send a transactions, click Inputs and manually choose what to use (I always do this).

When fees are low, you could send the dust to a burner address (one at a time, each to a different address), or you could even consolidate the dust and your real inputs as long as the fees are lower than the dust is worth. Make sure to only use the dust input and your real input from one address at a time, so you don't link different addresses together (which would reduce your privacy).

Awesome! Many thanks this is exactly what I was looking for. Googling didn't help much, because I'd only get generic articles about what dust attack is. And some occasional mentions that samourai wallet allows you to lock those transactions.
Again, thanks for the help.

Quote from: Lucius on June 01, 2019, 10:10:31 AM

Quote from: vvic on June 01, 2019, 07:21:54 AM

I've been getting tons of dust transactions to my wallet, 0.00000546BTC every month or so.

Is that dust transactions come from this address? : 1ViViGLEawN27xRzGrEhhYPQrZiTKvKLo

If that is the case I explain all few months ago, so you can follow advice you get in this thread, or maybe write to this company and ask them to stop sending free donations to your address.

https://bitcointalk.org/index.php?topic=5103542.0

no it is from this address https://www.blockchain.com/btc/address/1BettingEynX2Lg24jnmCGDHL3vC6r9yX1 looks like they've spammed a lot of addresses