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:
I have used CryptoMixer.io yesterday ( 2021-02-03 ) and sent you 0.22105296 BTC to your following wallet:
https://www.blockchain.com/btc/address/1FiMinE1ayijfGM1uaZ5XpSSdiAwq1NoqJMy receiving wallet did not receive anything from you since then. See here:
https://www.blockchain.com/btc/address/bc1q5m5wj3jxnhq8448uc2sar6nw56nvyw0evvfjl0I am 100% sure that I used your real website
http://cryptomixer.io because I have a bookmark on my browser and the mixing worked fine last year several times.
But now - obviously - you guys are randomly generating Letters of Guarantee which are signed with another btc address. Here is my letter of guarantee which I received from your website, see for yourself:
-----START SIGNING BITCOIN ADDRESS-----
1CrypMixUKiXduy6J42nEzm4Z9CpJuXptS
-----END SIGNING BITCOIN ADDRESS-----
-----START LETTER OF GUARANTEE-----
We hereby confirm that
WWW.CRYPTOMIXER.IO has generated the address 1FiMinE1ayijfGM1uaZ5XpSSdiAwq1NoqJ in order to transfer incoming amount (minus fee) to the following addresses: 100% to bc1q5m5wj3jxnhq8448uc2sar6nw56nvyw0evvfjl0 after 0 hours. This service will be only available for all bitcoins received from 2021 February 3, 13:01:28 UTC to 2021 February 4, 13:01:28 UTC with minimum amount of 0.001 BTC per single transaction and maximum amount of 157.1893 BTC total. Our fee is 0.6143% + 0.0005 BTC for every target address. This letter is digitally signed by our main account: 1CrypMixUKiXduy6J42nEzm4Z9CpJuXptS. Stay protected and thank you for using our service.
-----END LETTER OF GUARANTEE-----
-----START DIGITAL SIGNATURE-----
HEqokuNcbMlyBPiRs6Bmlk3zGzq/QdenTGEK1peu/+kVV+tJA6c7YjcDN4JeOzIoyJzcf9F41YCxxR77X786ZY8=
-----END DIGITAL SIGNATURE-----