I'm not gonna jump to conclusions either one is legit, I noticed the .io domain was also just registered recently (5 months ago as of today)[1]. Just thinking of the possible scenario of the same scammer making multiple copy versions too to make some sort of repressions that the original is only one of them.
I found one review that attached proof of payment[2], the bitcoins were sent to the (what I assume) Mexc account deposit address.
If what you mentioned is the deposit address of the scammer admin of Iceriver, then the OP should contact MEXC support to check if the deposit address of this scammer belongs to the MEXC account. If, indeed, the scammer who stole the $48,000 has a MEXC account, The OP must create an account on this exchange platform, pass the identity verification, and then provide the following proof and documents to MEXC online support or via email:
**Supporting documents that are sufficient to prove that the reported address/account is associated with your crypto assets, including but not limited to: screenshots of your digital wallet/account transfer history, transaction ID, transfer address, and a detailed text description of the case + Proof of police acceptance of the case within 48 hours of submitting the supporting documents.**
MEXC will freeze the stolen assets and the scammer's account temporarily if the documents and proof provided by the OP are sufficient.
[1] Stolen Asset Handling Process:
https://www.mexc.com/support/articles/15440563148953[2] Reporting Theft/Fraud on MEXC:
https://support.mexc.com/hc/en-001/articles/15480196102809-Reporting-Theft-Fraud-on-MEXC