If the server launches a Sybil attack, that is by definition not detectable by the client.
You are lying, you already know that clients are able to detect if the coordinator tries to partition its inputs:
There's always a small risk of getting Sybil attacked; it's just the way coinjoins are constructed. But, no, we have Mr. Absolute Truth here harassing anyone who dares to claim that Wasabi might not cure cancer.
Okay why can't you prove it then? You keep repeating this claim, but you haven't come up with any methods that would allow you to simultaneously exploit the trustless protocol in 3 different ways:
Your "solutions" don't protect you against a malicious coordinator
Why wouldn't my solutions protect me? Explain how I can still be Sybil attacked if I use the methods I described to you. Start with method 1, explain how the malicious coordinator could defeat it, then go on to method 2, explain how the malicious coordinator could defeat it, then go on to method 3 and explain how a malicious coordinator could defeat it.
Thanks to its design, the WabiSabi protocol is completely invulnerable to a Sybil attack and you've provided absolutely no evidence or argument otherwise.
Remember that it was proven that there is not just one, not just 2, but 3 different ways you can verify that the coordinator is not performing a Sybil attack!
My points proved conclusively that coordinators are trustless. You can even use all 3 anti Sybil methods together at once, you don't have to rely on just one:
- First, register your private coin to the coordinator. If it's accepted, then there's no Sybil attack.
- Second, ask your friend to register a coin to the same round. If it's accepted, then you've confirmed for a second time that there's no Sybil attack.
- Third, just to be absolutely sure, back out of the round during signing to check to see if the transaction was built to target you. If the transaction is created, you've confirmed for a third time that there's no Sybil attack.
- First, register your private coin to the coordinator. If it's accepted, then there's no Sybil attack.
- Second, ask your friend to register a coin to the same round. If it's accepted, then you've confirmed for a second time that there's no Sybil attack.
- Third, just to be absolutely sure, back out of the round during signing to check to see if the transaction was built to target you. If the transaction is created, you've confirmed for a third time that there's no Sybil attack.
