How the Anonymous Artist Banksy Authenticates His or Her Work
It all starts off with a fairly bog standard gallery style certificate. Details of the work, the authenticating agency, a bit of embossing and a large impressive signature at the bottom. Exactly the sort of things that can be easily copied by someone on a mission to create the perfect fake.
That torn-in-half banknote though? Never mind signatures, embossing or wax seals. The Di Faced Tenner is doing all the authentication heavy lifting here.
The tear is what uniquely separates the private key, the half of the note kept secret under lock and key at Pest Control, with the public key. The public key is the half of the note attached to the authentication certificate which gets passed on with the print, and allows its authenticity to be easily verified.
We have no idea what has been written on Pest Control’s private half of the note. Which means it can’t be easily recreated, and that empowers Pest Control to keep the authoritative list of who currently owns each authenticated Banksy work.
me • April 10, 2019 6:55 AM
do i have understood this well?
1-he wrtite two random numbers
2-he attach one of them on the paint and keep the other for himself
3-when you receive the paint you call him and ask “i have number 12345 is this real?” and he say “yes!” (but i don’t get what the private part of the key/number is used for)
i understand that:
-if someone sells the paint he should inform the author.
this because otherwise if the “public” number goes public anyone can just attach it on the fake paint and anyone calling “i have 12345 is real?” will get a yes.
but if the author is informed and get a call he can know who has it now and verify directly with the actual owner if he intend to sell it, otherwise he knows that the “public” number has leaked.
to me it seems that this works not because of public/private key (as in computer security) but more because:
-anyone will want to verify before buy to avoid wasting money on a fake. so they will call the author and give the number
-the author will contact the owner because he knows who is the actual owner and ask for a confirmation “do you still have the paing? are you going to seel this to x?”
-the number is just a way to hide the actual owner so that only the author can contact him.