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The letter of guarantee is on the website
Letter of Guarantee
You can check the guarantee letter at our check status page
how do you know that the user did not manually deleting the logs ?
We send out fresh coins thats been aged and mixed before dispensing
we have resolved all our claims , errors do occur and we are here to solve it.
A letter of guarantee is an actual contract that lists the deposit and the withdraw addresses, the fee structure and the timeframe of validity. This contract needs to be electronically signed by you... Either using a pgp keypair or a bitcoin keypair... The public key (or address) HAS to be known. This way anybody can verify the contract.
This is what a "letter of guarantee" means in the bitcoin mixer context.
I just visited your site, and i can't find a "check status" page... Even if i did, a "check status" is not equal to a letter of guarantee...
Some random pieces of text are NOT a letter of guarantee, a canary is NOT a letter of guarantee...
I'm happy the issue for this particular user got fixed, but you really need to rethink your concept... The current setup does not suffice (as proven by this user's issue)