Re: [WO] Permutations of precious washers, and recovery of losses thereof
Just seeing this for the first time. Damn, I like it. Though you probably want to research the properties of your washer material carefully, if you want for it to be fire-resistant, etc. Compare Jameson Lopps trials of various seed-storage products.
Most importantly, this requires no Bitcoin-specific hardware purchases that are usually infeasible to make anonymously. Inexpensive materials available at any hardware store, and maybe even already on-hand in your garageexcellent!
Final edit: Thinking over those numbers, and the BIP 39 use of a bit of PBKDF2, I am slightly revising down my estimates of how many lost washers you can recover. I am accustomed to thinking pessimistically from a defenders perspective, and thus making somewhat liberal assumptions about what a cracker can do. Whereas I dont want to dose people with hopium about how many lost seed words they can get back, realistically. Lets put it this way: I would not be surprised if somebody can crack 4 words on high-end home PC hardware in a semi-reasonable time; but if you rely on doing that, you may be in for a lot of pain!
Yeah. I liked it too and did it.
Using those stamps is pretty hard work on little washers. I also bought cheap ($10) engraver off ebay that is much easier to use, though not quite as "official" looking.