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Block: construct genesis block coinbase from individual values

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In particular,

- the input script is constructed from the difficulty target and the genesis message
- the output script is constructed from the pubkey via ScriptBuilder.createP2PKOutputScript()
This commit is contained in:
Andreas Schildbach 2025-03-09 12:53:45 +01:00
parent 4fe444ddb2
commit 4b826aac8c
1 changed files with 11 additions and 14 deletions
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25
core/src/main/java/org/bitcoinj/core/Block.java
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@ -32,7 +32,6 @@ import org.bitcoinj.crypto.ECKey;
import org.bitcoinj.params.BitcoinNetworkParams; import org.bitcoinj.params.BitcoinNetworkParams;
import org.bitcoinj.script.Script; import org.bitcoinj.script.Script;
import org.bitcoinj.script.ScriptBuilder; import org.bitcoinj.script.ScriptBuilder;
import org.bitcoinj.script.ScriptOpCodes;
import org.slf4j.Logger; import org.slf4j.Logger;
import org.slf4j.LoggerFactory; import org.slf4j.LoggerFactory;
@ -43,6 +42,7 @@ import java.io.OutputStream;
import java.math.BigInteger; import java.math.BigInteger;
import java.nio.BufferUnderflowException; import java.nio.BufferUnderflowException;
import java.nio.ByteBuffer; import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.time.Duration; import java.time.Duration;
import java.time.Instant; import java.time.Instant;
import java.time.temporal.ChronoUnit; import java.time.temporal.ChronoUnit;
@ -239,22 +239,19 @@ public class Block extends BaseMessage {
} }
private static List<Transaction> genesisTransactions() { private static List<Transaction> genesisTransactions() {
Transaction tx = Transaction.coinbase(genesisTxInputScriptBytes); byte[] messageBytes = GENESIS_MESSAGE.getBytes(StandardCharsets.US_ASCII);
tx.addOutput(new TransactionOutput(tx, FIFTY_COINS, genesisTxScriptPubKeyBytes)); Script scriptSig = // TODO find out what the pushdata(4) is supposed to mean
new ScriptBuilder().bigNum(STANDARD_MAX_DIFFICULTY_TARGET).bigNum(4).data(messageBytes).build();
Transaction tx = Transaction.coinbase(scriptSig.program());
tx.addOutput(new TransactionOutput(
tx, FIFTY_COINS, ScriptBuilder.createP2PKOutputScript(GENESIS_OUTPUT_PUBKEY).program()));
return Collections.singletonList(tx); return Collections.singletonList(tx);
} }
// A script containing the difficulty bits and the following message: private static final String GENESIS_MESSAGE =
// "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks";
// "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks" private static final byte[] GENESIS_OUTPUT_PUBKEY = ByteUtils.parseHex(
private static final byte[] genesisTxInputScriptBytes = ByteUtils.parseHex "04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f");
("04ffff001d0104455468652054696d65732030332f4a616e2f32303039204368616e63656c6c6f72206f6e206272696e6b206f66207365636f6e64206261696c6f757420666f722062616e6b73");
private static final byte[] genesisTxScriptPubKeyBytes = new ScriptBuilder()
.data(ByteUtils.parseHex("04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f"))
.op(ScriptOpCodes.OP_CHECKSIG)
.build()
.program();
@Override @Override
public int messageSize() { public int messageSize() {