The equipment and the names

Get these items:

• The word sheet of fuguseed-words(1), printed on A4 paper, on both sides, at 100 percent scale, and in color.
• Three dice: one d8 with the faces 1 to 8, and two d16 with the faces 1 to 16. Give one color to each die: YELLOW to the d8, BLUE to one d16, and RED to the other d16.
• Two sheets of paper for the words, and a pen.
• A cup, or a box, for the throw of the dice.

The names of the dice are the names on the sheet. YELLOW gives the block, BLUE gives the row, and RED gives the column. The word "device" on this page is the equipment that reads the 12 words at the end.

NOTE: The faces 6 and 9 of a d16 read the same upside down. A die with a line below the number shows which one it is. With a die without that line, turn the die so that the other numbers of the face read correctly.

The steps before the start

Do these steps first:

1. Find a room with no other person, no camera, and no window at your back.
2. Print the word sheet, and check the print against the file with fuguseed-words(1).
3. Write the numbers 1 to 12 on the first sheet of paper, one number for each line.
4. Throw each die 10 times, and read the results. A die that gives one face 5 times or more is a bad die. Get another die.

How to find one word

Each word needs one throw of the three dice. Do these steps for one word:

1. Put the three dice in the cup, and throw them on the table.
2. Read the YELLOW die. It gives the block, 1 to 8. The blocks 1 to 4 are on side 1 of the sheet, and the blocks 5 to 8 are on side 2.
3. Find the table of that block. The caption of the table holds the word YELLOW and the number.
4. Read the BLUE die. It gives the row, 1 to 16. Find the row with that number in the first column.
5. Read the RED die. It gives the column, 1 to 16. Find the column with that number in the first row.
6. Read the word in the cell of that row and that column.
7. Write the word on the line of its position.

Do not throw a die again because you do not like a word. Each throw gives one word, and the procedure keeps that word.

The words 1 to 11

Find the words 1 to 11 with the steps above, one word for each line.

Read the 11 words again, and compare each word with the sheet. Each word must be complete and correct.

The word 12

Word 12 is the check word. The dice give word 12 like every other word: throw the three dice, and write the word of the cell. The checksum of the 12 words is correct for one word of the BLUE row of that throw only. One throw in 16 gives that word.

Do these steps:

1. Find word 12 with the steps of "How to find one word".
2. Start fuguseed-qr(1) on an air-gapped computer, and type the 12 words.

The program prints one word, or it prints the SeedQR. Both results are correct.

With one word, that word is the check word of the BLUE row of your throw. Write the check word in place of word 12 on the paper. Start the program again, and type the 12 words again. The program prints the SeedQR.

With the SeedQR, your throw gave the check word. Keep word 12 on the paper, and write no new word.

The check word carries no entropy: it is a function of the other bits. The YELLOW block and the BLUE row of your throw stay the throw of the dice.

The steps after the procedure

Do these steps at the end:

1. Read the 12 words on the paper, and compare each word with the sheet.
2. Write the 12 words on the second sheet of paper, and compare the two copies word for word. Keep the two copies in two places.
3. Draw the SeedQR with fuguseed-qr(1), and scan it with the camera of the device.
4. Compare the words on the device with the words on the paper, word for word, and in the same order. Do this before you use the seed.
5. Do not type a BIP39 passphrase, and do not accept one from a device. A passphrase makes another seed, and this paper does not hold it.
6. Keep the SeedQR drawing and the two copies of the words. Burn or shred every other paper of the procedure, and clear the table.
7. Erase the words from the air-gapped computer, and close the program.

Use fuguseed-qr(1) for the SeedQR. The SeedQR is the form of the 12 words that a consumer, such as FuguPass, reads.