Re: PureMixer.io - service for anonymization of crypto transactions | Bitcoin mixer
A unique order number key instead of a letter of guarantee.
You do know the purpose of a Letter of Guarantee, right? It's so the user has hard evidence in case you don't deliver. A "unique number" proves nothing.Quote
You don't need to download anything, just copy it and save it
You can do that with a Letter of Guarantee too 