Blockmit Cold Wallet Washer Stamping Jig Four Character ID

thingiverse

This is a remix of a stamping jig for creating cryptocurrency cold wallets out of washers. If you want to know what this is about read following excellent article: [Make your cold wallet with washers](https://blockmit.com/english/guides/diy/make-cold-wallet-washers/) The change I did is to allow space for four character IDs on the washer instead of two. https://www.thingiverse.com/thing:4785256 presents a parametric version of the well thought out design by blockmit: https://www.thingiverse.com/thing:4590734. Both designs only allow two character IDs on top. This is fine if you only create one washer stack for one phrase. However I want to use Shamir secret sharing with my wallet phrases. There is a protocol that mixes bip-39 (the easily readable wallet phrases) with Shamir secret sharing. It is called slip-39. See https://github.com/satoshilabs/slips/blob/master/slip-0039.md and https://iancoleman.io/shamir39 for a browser-based implementation of that protocol. When using secret sharing you will have multiple so called shares. Each share will be a washer stack. In order to make sure that I don't accidentally mix up washers when handling multiple shares for different secrets I needed additional ID characters. Just a small change based on [muchtall's](https://www.thingiverse.com/thing:4785256) excellent scad-code. I have added a parameter "generate_four_id_characters". If set to yes (default) space for four ID characters will be created. If set to anything else only two spaces will be created. I also uploaded an STL with four ID characters spaces and the washer, screw and wing nut setup that is described in [blockmit's guide](https://blockmit.com/english/guides/diy/make-cold-wallet-washers/). Use the customizer or OpenScad if you need to change the dimensions of the model.