I got this answer:Hello. The Letter of Guarantee you provided is signed with different address. Your letter signed by 1CrypMix3194qKbmZBeM2TRxgBu1gorrB4. Our public address 1CrypMixXWtTjYGCM5ZJmyQYP1Y39P7aLM was created back in 2016 and has never changed.
If their server was hacked, they have to give us our money. This is FRAUD!!!!!!!!
If the server is hacked, obviously the attacker can change the signing address as mentioned on the site. That makes it difficult to know with certainty which is the official signing address. At this moment,
cryptomixns23scr.onion/faq.html shows
1CrypMixXWtTjYGCM5ZJmyQYP1Y39P7aLM, and was confirmed in this unedited post:
What you can do to make sure that the Letter of Guarantee has been generated not by third side besides checking the signature is to check the signing address provided in the Letter of Guarantee on the blockchain explorer. Our original signing address has been generated back in 2016 and has 32 pages of donation transactions on about 40 BTC in total and has never changed:
https://www.blockchain.com/btc/address/1CrypMixXWtTjYGCM5ZJmyQYP1Y39P7aLMThis address (1CrypMixXWtTjYGCM5ZJmyQYP1Y39P7aLM) was posted
in this topic in 2016 by several users.
I'll leave neutral feedback with this information.
Stay vigilant!