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After reading n0nce's Steel Washer Backup jig (customisable), Securing Your Seed Phrase with Washers, Stainless steel Bitcoin Recovery Seed Plate, m2017's post and ColorSEED Or how to simply hide your seed phrase, I think it's time to post an idea I've had for a while. I came up with a combination that doesn't require a 3D-printer or laser engraving. Just a normal printer is enough.
For security:
Printing on transparent sheets
You may need to adjust the printer setting. There are 2 types of sheets, either for laser printers or for ink jets.
Template
Tape it to a metal plate, get your center punch, and hammer the first 4 characters of each seed word with one dot per character. Then hammer 4 more dots in the red "oo" for alignment.
Remove and burn the plastic sheet. Disclaimer: check your local law before burning plastic
The size isn't perfect, it might be too small, but I don't want 24 seed words to take up a very large sheet of metal either. Maybe someone with better graphics skills than me can improve this.
100 dots
For 24 seed words, you'll end up with exactly 100 dots.
50 dots
For 12 seed words, use only "o" instead of "oo" just because 52 dots sounds less nice
Deciphering
Using exact 5 mm squares should make it possible to decipher the dots using only a ruler and a pencil, without printing on a transparent sheet. But that would make the required metal sheet size at least 13x24 cm for just 12 words. With accurate measuring, it should still be possible to decipher the dots without printing again.
Hiding in plain sight
Who's going to suspect a metal plate with "random" holes to hold your money?
Do I dare use it?
I haven't tested this yet (due to the lack of clean sheet metal), and wouldn't use it as the only backup for real funds.
No spam
Self-moderated against spam. Discussion is of course allowed.
For security:
I prefer to have 2 different backup systems in place for the same data. I do of course test both systems independently, to see if I can recover them (before funding).
Printing on transparent sheets
You may need to adjust the printer setting. There are 2 types of sheets, either for laser printers or for ink jets.
Template
Tape it to a metal plate, get your center punch, and hammer the first 4 characters of each seed word with one dot per character. Then hammer 4 more dots in the red "oo" for alignment.
Remove and burn the plastic sheet. Disclaimer: check your local law before burning plastic
The size isn't perfect, it might be too small, but I don't want 24 seed words to take up a very large sheet of metal either. Maybe someone with better graphics skills than me can improve this.
100 dots
For 24 seed words, you'll end up with exactly 100 dots.
50 dots
For 12 seed words, use only "o" instead of "oo" just because 52 dots sounds less nice
Deciphering
Using exact 5 mm squares should make it possible to decipher the dots using only a ruler and a pencil, without printing on a transparent sheet. But that would make the required metal sheet size at least 13x24 cm for just 12 words. With accurate measuring, it should still be possible to decipher the dots without printing again.
Hiding in plain sight
Who's going to suspect a metal plate with "random" holes to hold your money?
Do I dare use it?
I haven't tested this yet (due to the lack of clean sheet metal), and wouldn't use it as the only backup for real funds.
No spam
Self-moderated against spam. Discussion is of course allowed.