What I wanted to do:
I wanted to generate a private key and an public Adress by dicing with a cube (by hand).
So I found this site:
https://bip32jp.github.io/english/There is a field "Input Your own Entropy". In this field I entered the result of my dicing with the cube: So I typed in there:
"05341254025432525532221405053254102350515215014014231"
So I was able to find my private key in "Private Key (WIF)". It is "KzbeMzmeT5rYfA1rBQn3KyEz9Qpxpo9i7G9FSaFxvUwbWjfRFG6D".
So I imported this private key into my online-Wallet. And yes my online Wallet says that my public adress ist "17PiZaNS9C2xT9tZqqKsNAeaFHBkGXBeW", which is exactly the same as the adress given to the site ttps://bip32jp.github.io/english/
Conclusion: As this worked as expected, it seems that I have understand the process right.
But I have a question:The length of my entropy in the example above was 53. When I change on the site in the field "BIP39 passphrase" from 12 words to 24 words and I try to "generate New phrase", there is a message: "entropy incorrect". Yes, I understand, that if I now type in an entropy with a length of 99 it works. But I do not understand the difference between the length of 53 and 99. With a length of 53 I get a public adress with 33 characters and a private key with 52 characters. With the length of 99 I get also a public adress with 33 characters and a private key with 52 characters. So what is the advantage of choosing 99 instead of 53?
Would appreciate your explanations for a beginner.