This morning I had an apointment with a company that does quality control on PCBs.
They really have some high-end hardware, it was a very interesting tour.
Anyway, the engineer who was doing the tests on Coldkeys said he can't think of a method that can reveal the private key without damaging the card.
There is nothing to be seen, that's all.
I brought in two Loaded Coldkeys.
One that is done, loaded, and funded. It's serial "BTC-19.5M.14".
The other one was a test Coldkey with the privkey exposed, to compare tests.
The best they could come up with is this :
We can see the shape of the square paper that is underneath the hologram.
I made a short video when they were fiddling with settings to check what can be extracted from the Coldkey with x-rays.
Video :
https://streamable.com/z532hThere's nothing to see here.
They will try with a few other methods, one called "laminography" which is "3d xray" or something like that.
As the Xrays are sensible to the change ("contrast") in matter's atomic density, they told me that overall, they don't expect to see much from these tests.
Bump,
@Yogg I have confirmed with my father that if you provide one card with a hologram I can have it put through a medical/research scanner and through an IRM to try to see through the holo.
Obviously the card shouldn't be loaded, it doesn't have to have the printing on it.
[...]
Also, it is possible that the IRM test might be interrupted halfway if it looks like it could damage the multi-million machine.
Hello guigui371,
Thanks a lot for your proposal.
It is very interesting !
I'd love to see how a Coldkey looks under an MRI scan device.
Alright, I can do it and mark it in a way it's good only for such use.
I'll reach out to you to arrange it all and talk about it in more details.
Just bear in mind, that Coldkey, the operating company and myself cannot be held liable for any kind of damage that would happen with the MRI scan device.
Thank you.
Any idea on how to crack these Coldkeys ?