# Crypto exchange Bitfinex testing new AML compliance tool

Launched in production in 2020, Notabene’s Travel Rule solution now processes transactions among 50 crypto exchanges.

Fake non-membership proof in RSA accumulator

As explained in this answer, if one knows the trapdoor (factorization of modulus $$N$$) in an RSA accumulator, one can generate fake membership proofs. Does the same apply to non-membership proofs? More specifically:

Given $$A$$ is the value of an RSA accumulator and $$x$$ is a value present in $$A$$, if I know $$p$$ and $$q$$, where $$N = p cdot q$$, could I generate a non-membership proof saying that $$x$$ is not in $$A$$?

#### Crypto exchange Bitfinex testing new AML compliance tool

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