Only run this script if you understand the code and what it does. Anyone can fork it, turn it malicious and trick you into using it if you don't understand the underlying code. This script does not require any networking modules to function (except 'socket' to check for and warn you if you are connected to the internet, see line 36 in bip39_obfuscator.py). For safety reasons you should only run this script on an air-gapped computer that is not connected to the internet (do NOT reconnect this computer to the internet without wiping/reformatting it first). A better option would be to just do it manually with the "mapping_table.txt" file, but do not use Ctrl-F to find your words, as even that can be a security risk. Make sure to write down the obfuscated codepoints by hand, do not print them. Even better, stamp or engrave them on titanium plates to protect from fire or water damage.
This script obfuscates your mnemonic seed words by mapping their numerical positions in the BIP-39 English wordlist (raw file) of 2048 words to the Unicode codepoints of the characters at the same positions in the BIP-39 Traditional Chinese wordlist (raw file), both of which you need to download and put in the same folder as this script. Reversely, the script also accepts Unicode codepoints as input, so you can map them back to their original English words. It supports 12, 15, 18 and 24 word seeds. To run the script, you need Python 3.x installed on your system. Best of all, you don't even need this script or Python at all, you can do everything by hand if you want, "mapping_table.txt" is included for faster/easier lookup to save you the trouble.
If you want to encrypt your mnemonic seed words with a date shift cipher, see Seedshift instead.
The purpose of this is to be able to safely write down your mnemonic seed words obfuscated, without immediately making it obvious to a potential thief that he or she is dealing with a cryptocurrency mnemonic phrase, as the obfuscated seed words will look like random hexadecimal characters. Instead of writing down your mnemonic phrase as mosquito dust hotel maximum rich kitten hair mother salute dream flush hospital you could write it down as 5B F6 5B 57 61 62 72 38 6C 2E 6F C3 4E 4E 53 48 95 CA 52 E2 93 2F 4E 95.
The script optionally splits the obfuscated seed words into "2-out-of-3" recovery sheets, where each sheet stores two thirds of your obfuscated seed words. You need to combine any two sheets to recover your full mnemonic phrase, a single sheet is not enough. Store each at a different safe place or hand out to your family members or attorney. Remember, you need at least two sheets, if you lose them, you will not be able to recover your wallet.
Let's say mosquito dust hotel maximum rich kitten hair mother salute dream flush hospital are your MetaMask seed words. You need to write them down somewhere and keep them safe, but writing the original words down is a security risk. If anyone finds your list of words, they can drain your wallet. Even if you use a passphrase, they could return and force you at gunpoint or torture you until you give them the correct one. Instead, map the English words' positions in the wordlist to the Unicode codepoints of the characters at the same positions in the Traditional Chinese wordlist (don't worry, you don't need to know or learn Chinese), so they will have no clue what they are looking at in the first place.
Given the above seed words, the script will output a table with the English words, their number and the Unicode codepoint of the Chinese counterpart character in the Traditional Chinese wordlist:
| # | English | Number | Chinese |
|---|---|---|---|
| 1 | mosquito | 1153 | 5BF6 |
| 2 | dust | 547 | 5B57 |
| 3 | hotel | 882 | 6162 |
| 4 | maximum | 1100 | 7238 |
| 5 | rich | 1483 | 6C2E |
| 6 | kitten | 987 | 6FC3 |
| 7 | hair | 835 | 4E4E |
| 8 | mother | 1154 | 5348 |
| 9 | salute | 1527 | 95CA |
| 10 | dream | 533 | 52E2 |
| 11 | flush | 719 | 932F |
| 12 | hospital | 880 | 4E95 |
You can store the Chinese Unicode codepoints in multiple ways, since each is 4 characters long (just remember this fact when you want to rebuild your original seed words). You could write it unchanged: 5BF6 5B57 6162 7238 6C2E 6FC3 4E4E 5348 95CA 52E2 932F 4E95, or, to make it look even more random, as a bunch of hexadecimal characters that return useless nonsense when converted back to text ([ö[Wabr8l.oÃNNSHÊRâ/N), you could write it without spaces: 5BF65B57616272386C2E6FC34E4E534895CA52E2932F4E95, you could write it with a space every 2 characters: 5B F6 5B 57 61 62 72 38 6C 2E 6F C3 4E 4E 53 48 95 CA 52 E2 93 2F 4E 95, you could group two or more together: 5BF65B57 61627238 6C2E6FC3 4E4E5348 95CA52E2 932F4E95, etc. The script accepts Unicode codepoints in any format (with or without spaces) to later convert back into English words.
I included "mapping_table.txt" and "mapping_table_unicode_sorted.txt" files for manually looking up and converting the Unicode codepoints.
Optionally, you can split the obfuscated seed words into 2-out-of-3 recovery sheets. The script will output a table:
| Sheet 1 | Sheet 2 | Sheet 3 |
|---|---|---|
| #1: 5BF6 | #1: 5BF6 | #2: 5B57 |
| #2: 5B57 | #3: 6162 | #3: 6162 |
| #4: 7238 | #4: 7238 | #5: 6C2E |
| #5: 6C2E | #6: 6FC3 | #6: 6FC3 |
| #7: 4E4E | #7: 4E4E | #8: 5348 |
| #8: 5348 | #9: 95CA | #9: 95CA |
| #10: 52E2 | #10: 52E2 | #11: 932F |
| #11: 932F | #12: 4E95 | #12: 4E95 |
Write down and store each sheet separately at a different location.
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