If the recipient does not know about the crypto, tell them if they have a system that brings two emails that give a trusted person who knows about the crypto to ask them to take the coin:
- The files are not outside the desktop, but to "somewhere" in the machine, and rename the file to normal files.
- Hide the file into the picture, then save it in the machine one person.
- Write instructions on the sequencing of the paper, given to relatives.