paperwallet

This project aims to create a secure paper wallet by encrypting a cryptocurrency backup seed with AES. The seed can be accessed using a passphrase you define, either one your family could uncover or a private passphrase known only to you--allowing you to recover the seed with just the paper wallet and your memory. This ensures the seed is never stored in plain text, making it a secure legacy.

Requirements

To run the scripts, you'll need the following packages installed on your Linux system:

• openssl
• coreutils
• qrencode
• pandoc
• poppler-utils
• xclip
• zbar-tools
• fswebcam
• ssss

Installing Dependencies

You can install all required packages by running the following command (on Debian-based systems like Ubuntu):

sudo apt update
sudo apt install -y openssl coreutils qrencode pandoc poppler-utils xclip zbar-tools fswebcam ssss

Types of paper wallet

The paperwallet.sh script implements the creation of 4 different types paper wallets:

1. Seed plain text encoded in base64;
2. AES encrypted seed encoded in base64;
3. Seed split in parts using Shamir's secret sharing scheme;
4. Seed split in parts using Shamir's secret sharing scheme and also using AES encryption with a different key for each part.

Usage

Create a AES encrypted bitcoin paper wallet from your seed phrase. If necessary, edit the instructions markdown file to add additional instructions.

• instructions.md for the plain text wallet;
• instructions_encrypted.md for the AES wallet;
• instructions_sss.md for the Shamir's wallet;
• instructions_encsss.md for the Shamir's AES wallet.

Also edit walletinfo.md to add your wallet info.

Edit secret file and input your backup seed phrase, then run the paperwallet.sh script:

$ ./paperwallet.sh -n    # plain text wallet
$ ./paperwallet.sh       # AES encrypted wallet (default)
$ ./paperwallet.sh -s -n # Shamir's wallet
$ ./paperwallet.sh -s    # Shamir's AES wallet

To retrieve the backup seed open the PDF file to copy (screenshot) the QR code or use the webcam to capture the QR code on paper.

For using a screenshot of the PDF file, do:

$ ./qrcode_decode.sh clipboard

For use the backup paper and your webcam, do:

$ ./qrcode_decode.sh webcam

The PDF contains the instructions to retrieve the seed.