Initially, the idea was to generate a seed (and wallet address) without any involvement of the computer at all. But it turned out that this would take a lot of time, about 20 hours:) So I had to simplify the task.

So, we need:

Flip a coin 256 times and write the result (0 - heads, 1 - tails or vice versa)

Write the result, separating every 11 bits, like this:

Do not pay attention to the "tail" of 3 bits yet.

Convert binary values to decimal values using a calculator in offline system, or using knowledge of computer science)

Now take a list of 2048 words and find them by number, counting starts from zero, so for the number 1162 we are looking for the word number 1163.

It remains to determine the last 24 word. It is calculated using SHA-256 algorithm - this makes the calculation manually very difficult.

Here's shows a manual calculation. The funny thing is that the video shows only one iteration, but needs 64 iterations. It took him 16 minutes to do just one.

Take as input the whole number (256 bits) obtained at the beginning. This is done in the console.

Result: c716ada6e8ebd952598bb5622ccbd119620a9ad0ccbcf29ad55077a38603d61b

From this line we are interested in the first two characters: c7

Convert this number from hexadecimal to binary: 11000111, and add a 3-bit "tail" to the beginning of this number: 11111000111

Convert it to decimal system: 1991

Last word: wedding

When importing a seed into the wallet, do not forget to add a passphrase for greater security.

May Bitcoin be with you, my friends)