yes i made a post about laser engravers and how CHEAP they are like $30 now! its just a laser and a printr basically!

You can use it to engrave a QR code of your steemit walet master key onto a quartz crystal or make a TINY qr code etched microscopically ontoa plate of glass or in your contact lens

I know the cheapest one hre is $99 but I found a bunch iof $30 and $30 ones they are supr cheap and why wouldnt they be its just a printer with a laser instead of ink lol

And then laser Engrave the QR code of your steemit password key or bitcoin wallet key onto a Quartz Crystal and it would be so sci fi ...the crystal could be worth so much money!
or make it invisible