Dear designheadstudio,
Your method sounds quite good.
However, I would recommend this further proceedure:
___ Place your afformentioned packaging array into a stone box, securely cementing the stone top with the highest quality modern cement. Don't forget to include a jackhammer attached, so that the person at the receiving end can get the package open in under a day's time.
___ Select only young, strong, fit virgins to transport your stone mailer to its package shipping site. These young virgins cannot be drinkers, smokers, etc, because such flaws in character could kick into play while they delivered your package to its mailing site, thus delaying the whole process of transfer from YOU the artist to PURCHASER at the other end.
____ Once received, have your purchaser send you a return letter - ONLY on the finest goat skin, signed in his own blood, not more than two days old, which you should get a local laboratory to confirm via DNA testing:
(a) to confirm that it is indeed the blood of your purchaser, and
(b) that it is indeed ONLY not more than two days old.
____ Upon receipt of final payment, you must send your purchaser a gold placque stating that you are the sole artist, owner, transactor of sale, etc.. This plaque should include your entire history as far back as you can remember, and even geneologically farther (if possible, which would require many hours in the library) to insure a proper painting history record [there's a fancy name for this which I've forgotten at the moment].
Doing all this will guarantee a perfectly protected sales transaction.
?...!
______________click on picture for images

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