I gave him a negative trust.

Let's see if he will answer you or keep running without giving any explanation.

Yes you are right.
Nevertheless, I can go for such measures.

I and other users tried to understand how you can verify their signature of the letter of guarantee, unfortunately no information on how the signature is generated is not on the site. I also tried to get a hash - from the public data in the guarantee letter - to no avail.

I suspect that "smartmixer" - just might say - * the signature is not mine (but no one can check), I didn’t have you, I don’t know who you are * - given the size of the amount sent.