Safet - A wallet made in JAVA (WIP - Testing purposes only, so far)

[Vampobit]

Alright, so if you go to my OP where I have a printed execution example, I could say that my public key starts with 02 and therefore it is compressed, correct ? it must be so, because I used the default method (from bitcoinj) uses a compressed key!

Yes. If you generate many keys, sometimes you will see 02, sometimes 03.
There is great page https://learnmeabitcoin.com/technical/ which could be very helpful for you. All the algorithms are explained there and you may test calculations/examples yourself.

That page is about 2 kinds of public key: https://learnmeabitcoin.com/technical/public-key
Uncompressed public key from your OP would be:

Code:

Private Key: b49bd68e4f1bd220e90871031860009b0b44654268cb1e4dcdca93743fc7961e
04a16995de6cd203c0459a841752fad6941a65ca43a0cbf629f3413d64db7fb24cdcf2530931fba3705b3054de3e16cfacbdfabd32caa9bd2bff42e66e3a45d6ac

Actually, learnmebitcoin helped toooo much in understanding and developing the simple app that I have developed. What would you say about entropy generation ? Would you only use java's SecureRandom ?

[1715003648]

1715003648

[1715003648]

1715003648

[PawGo]

Actually, learnmebitcoin helped toooo much in understanding and developing the simple app that I have developed. What would you say about entropy generation ? Would you only use java's SecureRandom ?

I do not know.
If it is for learning purposes, you may use whatever you want if it only gives you fun. You may experiment with different inputs etc.
For serious usage I would stay with secure solutions understanding what they really do. You call java method, but what does it mean? Depending on system it may use Windows or Linux entropy source etc - that subject is really wide and you may read a lot about it.

If you base your program purely on user input, you will receive nothing else than brainwallet generator.

[Vampobit]

Actually, learnmebitcoin helped toooo much in understanding and developing the simple app that I have developed. What would you say about entropy generation ? Would you only use java's SecureRandom ?

I do not know.
If it is for learning purposes, you may use whatever you want if it only gives you fun. You may experiment with different inputs etc.
For serious usage I would stay with secure solutions understanding what they really do. You call java method, but what does it mean? Depending on system it may use Windows or Linux entropy source etc - that subject is really wide and you may read a lot about it.

If you base your program purely on user input, you will receive nothing else than brainwallet generator.

yes! indeed! thanks! no it's for educational purposes only.

[Vampobit]

I added the bech32 address generation, as well as its QR code

[I_Anime]

I am currently learning Java. Please can you tell me how long its gonna take base on effort before I can generate wallet address with it and how can I learn  everything about wallet

[Vampobit]

I am currently learning Java. Please can you tell me how long its gonna take base on effort before I can generate wallet address with it and how can I learn  everything about wallet

Hi, congrats! It took me approx. 12-15 hours. I work professionally as a java dev since 2018. I don't think that the java part is difficult. However, understanding the theory was a bit tricky. This website helped me a lot https://learnmeabitcoin.com/