private static Block createGenesis(NetworkParameters n) {
Block genesisBlock = new Block(n);
Transaction t = new Transaction(n);
try {
// A script containing the difficulty bits and the following message:
//
// "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks"
byte[] bytes =
Utils.HEX.decode(
"04ffff001d0104455468652054696d65732030332f4a616e2f32303039204368616e63656c6c6f72206f6e206272696e6b206f66207365636f6e64206261696c6f757420666f722062616e6b73");
t.addInput(new TransactionInput(n, t, bytes));
ByteArrayOutputStream scriptPubKeyBytes = new ByteArrayOutputStream();
Script.writeBytes(
scriptPubKeyBytes,
Utils.HEX.decode(
"04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f"));
scriptPubKeyBytes.write(ScriptOpCodes.OP_CHECKSIG);
t.addOutput(new TransactionOutput(n, t, FIFTY_COINS, scriptPubKeyBytes.toByteArray()));
} catch (Exception e) {
// Cannot happen.
throw new RuntimeException(e);
}
genesisBlock.addTransaction(t);
return genesisBlock;
}
/**
* NetworkParameters contains the data needed for working with an instantiation of a Bitcoin chain.
*
* <p>This is an abstract class, concrete instantiations can be found in the params package. There
* are four: one for the main network ({@link MainNetParams}), one for the public test network, and
* two others that are intended for unit testing and local app development purposes. Although this
* class contains some aliases for them, you are encouraged to call the static get() methods on each
* specific params class directly.
*/
public abstract class NetworkParameters implements Serializable {
/** The protocol version this library implements. */
public static final int PROTOCOL_VERSION = 70001;
/**
* The alert signing key originally owned by Satoshi, and now passed on to Gavin along with a few
* others.
*/
public static final byte[] SATOSHI_KEY =
Utils.HEX.decode(
"04fc9702847840aaf195de8442ebecedf5b095cdbb9bc716bda9110971b28a49e0ead8564ff0db22209e0374782c093bb899692d524e9d6a6956e7c5ecbcd68284");
/** The string returned by getId() for the main, production network where people trade things. */
public static final String ID_MAINNET = "org.bitcoin.production";
/** The string returned by getId() for the testnet. */
public static final String ID_TESTNET = "org.bitcoin.test";
/** The string returned by getId() for regtest mode. */
public static final String ID_REGTEST = "org.bitcoin.regtest";
/** Unit test network. */
public static final String ID_UNITTESTNET = "org.bitcoinj.unittest";
/** The string used by the payment protocol to represent the main net. */
public static final String PAYMENT_PROTOCOL_ID_MAINNET = "main";
/** The string used by the payment protocol to represent the test net. */
public static final String PAYMENT_PROTOCOL_ID_TESTNET = "test";
// TODO: Seed nodes should be here as well.
protected Block genesisBlock;
protected BigInteger maxTarget;
protected int port;
protected long
packetMagic; // Indicates message origin network and is used to seek to the next message when
// stream state is unknown.
protected int addressHeader;
protected int p2shHeader;
protected int dumpedPrivateKeyHeader;
protected int interval;
protected int targetTimespan;
protected byte[] alertSigningKey;
protected int bip32HeaderPub;
protected int bip32HeaderPriv;
/**
* See getId(). This may be null for old deserialized wallets. In that case we derive it
* heuristically by looking at the port number.
*/
protected String id;
/** The depth of blocks required for a coinbase transaction to be spendable. */
protected int spendableCoinbaseDepth;
protected int subsidyDecreaseBlockCount;
protected int[] acceptableAddressCodes;
protected String[] dnsSeeds;
protected Map<Integer, Sha256Hash> checkpoints = new HashMap<Integer, Sha256Hash>();
protected NetworkParameters() {
alertSigningKey = SATOSHI_KEY;
genesisBlock = createGenesis(this);
}
private static Block createGenesis(NetworkParameters n) {
Block genesisBlock = new Block(n);
Transaction t = new Transaction(n);
try {
// A script containing the difficulty bits and the following message:
//
// "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks"
byte[] bytes =
Utils.HEX.decode(
"04ffff001d0104455468652054696d65732030332f4a616e2f32303039204368616e63656c6c6f72206f6e206272696e6b206f66207365636f6e64206261696c6f757420666f722062616e6b73");
t.addInput(new TransactionInput(n, t, bytes));
ByteArrayOutputStream scriptPubKeyBytes = new ByteArrayOutputStream();
Script.writeBytes(
scriptPubKeyBytes,
Utils.HEX.decode(
"04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f"));
scriptPubKeyBytes.write(ScriptOpCodes.OP_CHECKSIG);
t.addOutput(new TransactionOutput(n, t, FIFTY_COINS, scriptPubKeyBytes.toByteArray()));
} catch (Exception e) {
// Cannot happen.
throw new RuntimeException(e);
}
genesisBlock.addTransaction(t);
return genesisBlock;
}
public static final int TARGET_TIMESPAN =
14 * 24 * 60 * 60; // 2 weeks per difficulty cycle, on average.
public static final int TARGET_SPACING = 10 * 60; // 10 minutes per block.
public static final int INTERVAL = TARGET_TIMESPAN / TARGET_SPACING;
/**
* Blocks with a timestamp after this should enforce BIP 16, aka "Pay to script hash". This BIP
* changed the network rules in a soft-forking manner, that is, blocks that don't follow the rules
* are accepted but not mined upon and thus will be quickly re-orged out as long as the majority
* are enforcing the rule.
*/
public static final int BIP16_ENFORCE_TIME = 1333238400;
/** The maximum number of coins to be generated */
public static final long MAX_COINS = 21000000;
/** The maximum money to be generated */
public static final Coin MAX_MONEY = COIN.multiply(MAX_COINS);
/** Alias for TestNet3Params.get(), use that instead. */
@Deprecated
public static NetworkParameters testNet() {
return TestNet3Params.get();
}
/** Alias for TestNet2Params.get(), use that instead. */
@Deprecated
public static NetworkParameters testNet2() {
return TestNet2Params.get();
}
/** Alias for TestNet3Params.get(), use that instead. */
@Deprecated
public static NetworkParameters testNet3() {
return TestNet3Params.get();
}
/** Alias for MainNetParams.get(), use that instead */
@Deprecated
public static NetworkParameters prodNet() {
return MainNetParams.get();
}
/** Returns a testnet params modified to allow any difficulty target. */
@Deprecated
public static NetworkParameters unitTests() {
return UnitTestParams.get();
}
/** Returns a standard regression test params (similar to unitTests) */
@Deprecated
public static NetworkParameters regTests() {
return RegTestParams.get();
}
/** A Java package style string acting as unique ID for these parameters */
public String getId() {
return id;
}
public abstract String getPaymentProtocolId();
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
NetworkParameters other = (NetworkParameters) o;
return getId().equals(other.getId());
}
@Override
public int hashCode() {
return Objects.hashCode(getId());
}
/** Returns the network parameters for the given string ID or NULL if not recognized. */
@Nullable
public static NetworkParameters fromID(String id) {
if (id.equals(ID_MAINNET)) {
return MainNetParams.get();
} else if (id.equals(ID_TESTNET)) {
return TestNet3Params.get();
} else if (id.equals(ID_UNITTESTNET)) {
return UnitTestParams.get();
} else if (id.equals(ID_REGTEST)) {
return RegTestParams.get();
} else {
return null;
}
}
/**
* Returns the network parameters for the given string paymentProtocolID or NULL if not
* recognized.
*/
@Nullable
public static NetworkParameters fromPmtProtocolID(String pmtProtocolId) {
if (pmtProtocolId.equals(PAYMENT_PROTOCOL_ID_MAINNET)) {
return MainNetParams.get();
} else if (pmtProtocolId.equals(PAYMENT_PROTOCOL_ID_TESTNET)) {
return TestNet3Params.get();
} else {
return null;
}
}
public int getSpendableCoinbaseDepth() {
return spendableCoinbaseDepth;
}
/**
* Returns true if the block height is either not a checkpoint, or is a checkpoint and the hash
* matches.
*/
public boolean passesCheckpoint(int height, Sha256Hash hash) {
Sha256Hash checkpointHash = checkpoints.get(height);
return checkpointHash == null || checkpointHash.equals(hash);
}
/** Returns true if the given height has a recorded checkpoint. */
public boolean isCheckpoint(int height) {
Sha256Hash checkpointHash = checkpoints.get(height);
return checkpointHash != null;
}
public int getSubsidyDecreaseBlockCount() {
return subsidyDecreaseBlockCount;
}
/** Returns DNS names that when resolved, give IP addresses of active peers. */
public String[] getDnsSeeds() {
return dnsSeeds;
}
/**
* Genesis block for this chain.
*
* <p>The first block in every chain is a well known constant shared between all Bitcoin
* implemenetations. For a block to be valid, it must be eventually possible to work backwards to
* the genesis block by following the prevBlockHash pointers in the block headers.
*
* <p>The genesis blocks for both test and main networks contain the timestamp of when they were
* created, and a message in the coinbase transaction. It says, <i>"The Times 03/Jan/2009
* Chancellor on brink of second bailout for banks"</i>.
*/
public Block getGenesisBlock() {
return genesisBlock;
}
/** Default TCP port on which to connect to nodes. */
public int getPort() {
return port;
}
/** The header bytes that identify the start of a packet on this network. */
public long getPacketMagic() {
return packetMagic;
}
/**
* First byte of a base58 encoded address. See {@link org.bitcoinj.core.Address}. This is the same
* as acceptableAddressCodes[0] and is the one used for "normal" addresses. Other types of address
* may be encountered with version codes found in the acceptableAddressCodes array.
*/
public int getAddressHeader() {
return addressHeader;
}
/** First byte of a base58 encoded P2SH address. P2SH addresses are defined as part of BIP0013. */
public int getP2SHHeader() {
return p2shHeader;
}
/**
* First byte of a base58 encoded dumped private key. See {@link
* org.bitcoinj.core.DumpedPrivateKey}.
*/
public int getDumpedPrivateKeyHeader() {
return dumpedPrivateKeyHeader;
}
/**
* How much time in seconds is supposed to pass between "interval" blocks. If the actual elapsed
* time is significantly different from this value, the network difficulty formula will produce a
* different value. Both test and main Bitcoin networks use 2 weeks (1209600 seconds).
*/
public int getTargetTimespan() {
return targetTimespan;
}
/**
* The version codes that prefix addresses which are acceptable on this network. Although Satoshi
* intended these to be used for "versioning", in fact they are today used to discriminate what
* kind of data is contained in the address and to prevent accidentally sending coins across
* chains which would destroy them.
*/
public int[] getAcceptableAddressCodes() {
return acceptableAddressCodes;
}
/**
* If we are running in testnet-in-a-box mode, we allow connections to nodes with 0 non-genesis
* blocks.
*/
public boolean allowEmptyPeerChain() {
return true;
}
/**
* How many blocks pass between difficulty adjustment periods. Bitcoin standardises this to be
* 2015.
*/
public int getInterval() {
return interval;
}
/** Maximum target represents the easiest allowable proof of work. */
public BigInteger getMaxTarget() {
return maxTarget;
}
/**
* The key used to sign {@link org.bitcoinj.core.AlertMessage}s. You can use {@link
* org.bitcoinj.core.ECKey#verify(byte[], byte[], byte[])} to verify signatures using it.
*/
public byte[] getAlertSigningKey() {
return alertSigningKey;
}
/** Returns the 4 byte header for BIP32 (HD) wallet - public key part. */
public int getBip32HeaderPub() {
return bip32HeaderPub;
}
/** Returns the 4 byte header for BIP32 (HD) wallet - private key part. */
public int getBip32HeaderPriv() {
return bip32HeaderPriv;
}
}