Tell us how it happened so we don’t fall for the same. Identities doesn’t really help, I got scammed on hodlhodl and guy had 5 stars and several successful deals.
Yeah, but at least it massively increases the cost, now the scammer must engage in real trades and you can 1) identify wash trading and 2) fees provide some Sybil resistance. It's not about making it bulletproof, it's about making attacks a lot more costly
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