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Bitcoin / Development & Technical Discussion / Re: TX signature verification (derive z value with TX having mutiple inputs)

on: December 04, 2021, 12:49:43 AM

I made a little debugging with bitcoin-java library, with the help of blockstream api, to obtain the full hex of the transaction, and obtained the following: m=01000000022cce4dc9e7a2de90bacf13073c1b256c714c73f5f42f8d28d291ae40c58b0f21000000001976a914e3e67d92d6334b0274beb908067eddd09d37900d88acffffffff1e4f4d473a0488f3afccecf7e4facb09f1ef67975c6901af001663c79823437c0000000000ffffffff01d0390000000000001976a914232fc87e0fb5171b82bace360eed8e35ae59f05688ac0000000001000000 z=b7855748a719df6a358a6d4d83b47d6848403830481273eb81a1cde1a32343f8 So, if my m is correct, the mistake is in the 2nd input scriptSig field and the value.

Bitcoin / Development & Technical Discussion / Re: Is it possible to obtain the public key from any address?

on: December 03, 2021, 11:58:55 PM

In the new P2TR (pay-to-taproot) single key address type, the bech32 decoded address is also a public key.

Bitcoin / Project Development / bitcoin-java, a new bitcoin library

on: November 25, 2021, 12:06:29 AM

Hello, I'm posting to divulge a new open-source Bitcoin library written in Java, including support for taproot single key transactions: https://github.com/bitcoin-education/bitcoin-java. My main motivation to build this library was for educational purposes. Also, I was missing a lean bitcoin library written in Java, since I think bitcoinj too feature-heavy. I don't intend to include features that allow communication with nodes nor any online features in it. I think it will be another option for developers that want to build a wallet in Java or other JVM languages. Current features of the library: - Generate BIP39 mnemonic seeds - Derive extended keys - Generate Base58, Bech32 and Bech32m addresses - Create and sign Segwit, and non Segwit transactions (multi and single sig) - Create and sign taproot single-sig transactions - and more... Feedback, PRs, and issues are welcome and appreciated. Website of the project, where I plan to post more examples using it: https://www.bitcoineducation.site/

Bitcoin / Development & Technical Discussion / Re: How to get a masterKey faster. Need Java developer advice

on: November 24, 2021, 03:41:12 AM

I've been working on this bitcoin java library recently: https://github.com/bitcoin-education/bitcoin-java

Instructions to install it on README.

Generating a master key should be fast and easy. With bitcoin-java library:

Code:

String mnemonicSeedString = MnemonicSeedGenerator.generateRandom(256).getSentence(); // 24 words mnemonic seed as String
MnemonicSeed mnemonicSeed = new MnemonicSeed(mnemonicSeedString); // as an object
ExtendedPrivateKey masterKey = mnemonicSeed.toMasterKey(password, ExtendedKeyPrefixes.MAINNET_PREFIX.getPrivatePrefix()); // masterkey
masterPrivateKey.ckd("0'/1/2'/2/1000000000", true, ExtendedKeyPrefixes.MAINNET_PREFIX.getPrivatePrefix()) //first parameter is the derivation path, choose at will. second parameter is true to derive a private extended key, false for public

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