1

Wasabi is a new type of wallet with a built in tumbler if I'm correct. What stops someone from tainting the tumbling pool of coins with non-approved coins? I'm weary of using these privacy tools as I don't want my coinbase account frozen just because someone mixed a bad coin in the lot.

5

There are a number of reasons why this kind of blacklisting is problematic in practice, but take it with a grain of salt, because I'm the creator of Wasabi, so I am biased.

  • This Elliptic report identifies 0.65% of all Bitcoin transactions are mixing transactions. This means, if that kind of blacklisting would happen, they would have to blacklist most bitcoins in existence.
  • The same report states, 50% of DNM users don't use any mixing, but directly send to exchanges (mind blowing, I know) and these are the coins being blacklisted.
  • From another point of view, Wasabi's anonymity set will be constant 100, and if a coin from it is tainted, would they really blacklist all mixed coins, where every coin has exactly 1% chance of being the tainted one?
  • The user base of Traditional Bitcoin Mixers is limited to a certain type of user, who is in desperate need of privacy and in order to get it, he is willing to risk losing money. Since coin loss, and other issues are architecturally impossible with Wasabi, our target user is not limited to them, the target user of Wasabi Wallet is everyone, because everyone needs privacy.
  • If someone is extremely paranoid, he can just spend coins to himself a couple of times before sending it to the desired "legitimate" place. This is what Samourai's Ricochet is doing.
  • Speaking of legitimacy, zkSNACKs, the company behind Wasabi is a legitimate company. Privacy is not only not a crime, but a fundamental human right and if an entity would blacklist a mix output, they would be looking ahead of legal trouble. If such a thing would ever happen, please notify us.
2

Nobody prevents it. Tumbling however reduces the chances of getting taunted by increasing the BTC pool's size.

If you have problems with this method of coins mixing for any reason just don't use it.

1

AFAIK Coinbase looks for a five hops before / after incoming / outgoing TX. So adding extra hops will be enough for now. It can be automated with Samourai Wallet's Ricochet or my scripts for bitcoin-qt.

  • If everyone knows that coinbase analyzes 5 hops. Why can't they just detect this 5 hop pattern to see all the people using the samourai wallet? – Patoshi パトシ Aug 28 '18 at 16:39
  • Samourai Wallet's ricochet send is detectable, as it sends some small amount of BTC to Samourai Wallet's donation address. But there are other ways to do multi-hop send on blockchain too, as I mentioned. Most important thing - it is asymmetric attack on blockchain analysis. Sender's costs are relatively little, but analysis to fight this needs to increase number of hops they analyze, and do that for all transactions, not single one. – Kristaps Kaupe Sep 7 '18 at 15:50

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