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Crypto exchange eXch is being accused by ByBit and others of not stopping the criminals cashing out.

But over email the elusive owner of eXch - Johann Roberts - disputed that.

One exchange called eXch is apparently refusing to cooperate.

According to researchers at crypto investigators Elliptic, eXch is a platform notable for allowing its users to swap cryptoassets anonymously.

EXch has not responded to BBC requests for comment.