学術プロジェクトでさまざまな通貨を監視する必要があるため、BitcoinJ で zCash を使用することは、私にとって合理的な進歩のように思えます。現在、Dogecoin 開発者のネットワーク パラメータを使用して、Bitcoin と Litecoin の BitcoinJ とともに zCash でフル ノードを実行しています。
zCash がビットコインのコードベースを多く使用している状況から考えると、これは互換性があると思いますが、残念ながら単独で動作させることはできません。
ZcashMainNetParams に対する私のアプローチは次のとおりです (zCashs chainparams.cpp と共に BitcoinJ の MainNetParams クラスから多く使用されます)。
public class ZcashMainNetParams extends AbstractZcashMainNetParams {
public static final int MAINNET_MAJORITY_WINDOW = 1000;
public static final int MAINNET_MAJORITY_REJECT_BLOCK_OUTDATED = 950;
public static final int MAINNET_MAJORITY_ENFORCE_BLOCK_UPGRADE = 750;
public ZcashMainNetParams() {
super();
interval = INTERVAL;
targetTimespan = TARGET_TIMESPAN;
maxTarget = Utils.decodeCompactBits(0x1d00ffffL);
dumpedPrivateKeyHeader = 128;
addressHeader = 0;
p2shHeader = 5;
acceptableAddressCodes = new int[] { addressHeader, p2shHeader };
port = 8233;
packetMagic = 0xf9beb4d9 /* netmagic same as BTC ??? */;
bip32HeaderPub = 0x0488B21E; //The 4 byte header that serializes in base58 to "xpub".
bip32HeaderPriv = 0x0488ADE4; //The 4 byte header that serializes in base58 to "xprv"
majorityEnforceBlockUpgrade = MAINNET_MAJORITY_ENFORCE_BLOCK_UPGRADE;
majorityRejectBlockOutdated = MAINNET_MAJORITY_REJECT_BLOCK_OUTDATED;
majorityWindow = MAINNET_MAJORITY_WINDOW;
genesisBlock = createGenesis(this);
id = ID_MAINNET;
subsidyDecreaseBlockCount = 210000;
spendableCoinbaseDepth = 100;
String genesisHash = genesisBlock.getHashAsString();
checkState(genesisHash.equals("00040fe8ec8471911baa1db1266ea15dd06b4a8a5c453883c000b031973dce08"),
genesisHash); /* updated */
// This contains (at a minimum) the blocks which are not BIP30 compliant. BIP30 changed how duplicate
// transactions are handled. Duplicated transactions could occur in the case where a coinbase had the same
// extraNonce and the same outputs but appeared at different heights, and greatly complicated re-org handling.
// Having these here simplifies block connection logic considerably.
checkpoints.put(2500, Sha256Hash.wrap("00000006dc968f600be11a86cbfbf7feb61c7577f45caced2e82b6d261d19744")) /* updated */;
checkpoints.put(15000, Sha256Hash.wrap("00000000b6bc56656812a5b8dcad69d6ad4446dec23b5ec456c18641fb5381ba")) /* updated */;
checkpoints.put(67500, Sha256Hash.wrap("000000006b366d2c1649a6ebb4787ac2b39c422f451880bc922e3a6fbd723616")) /* updated */;
dnsSeeds = new String[] {
"dnsseed.z.cash", // Zcash
"dnsseed.str4d.xyz", // @str4d
"dnsseed.znodes.org" // @bitcartel
};
}
private static AltcoinBlock createGenesis(NetworkParameters params) {
AltcoinBlock genesisBlock = new AltcoinBlock(params, 4L);
Transaction t = new Transaction(params);
try {
byte[] bytes = Hex.decode
("04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f");
t.addInput(new TransactionInput(params, t, bytes));
ByteArrayOutputStream scriptPubKeyBytes = new ByteArrayOutputStream();
Script.writeBytes(scriptPubKeyBytes, Hex.decode
("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"));
scriptPubKeyBytes.write(ScriptOpCodes.OP_CHECKSIG);
t.addOutput(new TransactionOutput(params, t, COIN.multiply(50), scriptPubKeyBytes.toByteArray()));
} catch (Exception e) {
// Cannot happen.
throw new RuntimeException(e);
}
genesisBlock.addTransaction(t);
genesisBlock.setTime(1477641360L);
genesisBlock.setDifficultyTarget(504365040L);
genesisBlock.setNonce(0x0000000000000000000000000000000000000000000000000000000000001257L);
return genesisBlock;
}
private static ZcashMainNetParams instance;
public static synchronized ZcashMainNetParams get() {
if (instance == null) {
instance = new ZcashMainNetParams();
}
return instance;
}
@Override
public String getPaymentProtocolId() {
return PAYMENT_PROTOCOL_ID_MAINNET;
}
}
抽象クラスは、dogecoin 開発者からも再利用されます。
public abstract class AbstractZcashMainNetParams extends NetworkParameters {
/**
* Scheme part for Bitcoin URIs.
*/
public static final String BITCOIN_SCHEME = "zcash";
public static final int REWARD_HALVING_INTERVAL = 210000;
private static final Logger log = LoggerFactory.getLogger(AbstractZcashMainNetParams.class);
public AbstractZcashMainNetParams() {
super();
}
/**
* Checks if we are at a reward halving point.
* @param height The height of the previous stored block
* @return If this is a reward halving point
*/
public final boolean isRewardHalvingPoint(final int height) {
return ((height + 1) % REWARD_HALVING_INTERVAL) == 0;
}
/**
* Checks if we are at a difficulty transition point.
* @param height The height of the previous stored block
* @return If this is a difficulty transition point
*/
public final boolean isDifficultyTransitionPoint(final int height) {
return ((height + 1) % this.getInterval()) == 0;
}
@Override
public void checkDifficultyTransitions(final StoredBlock storedPrev, final Block nextBlock,
final BlockStore blockStore) throws VerificationException, BlockStoreException {
final Block prev = storedPrev.getHeader();
// Is this supposed to be a difficulty transition point?
if (!isDifficultyTransitionPoint(storedPrev.getHeight())) {
// No ... so check the difficulty didn't actually change.
if (nextBlock.getDifficultyTarget() != prev.getDifficultyTarget())
throw new VerificationException("Unexpected change in difficulty at height " + storedPrev.getHeight() +
": " + Long.toHexString(nextBlock.getDifficultyTarget()) + " vs " +
Long.toHexString(prev.getDifficultyTarget()));
return;
}
// We need to find a block far back in the chain. It's OK that this is expensive because it only occurs every
// two weeks after the initial block chain download.
final Stopwatch watch = Stopwatch.createStarted();
Sha256Hash hash = prev.getHash();
StoredBlock cursor = null;
final int interval = this.getInterval();
for (int i = 0; i < interval; i++) {
cursor = blockStore.get(hash);
if (cursor == null) {
// This should never happen. If it does, it means we are following an incorrect or busted chain.
throw new VerificationException(
"Difficulty transition point but we did not find a way back to the last transition point. Not found: " + hash);
}
hash = cursor.getHeader().getPrevBlockHash();
}
checkState(cursor != null && isDifficultyTransitionPoint(cursor.getHeight() - 1),
"Didn't arrive at a transition point.");
watch.stop();
if (watch.elapsed(TimeUnit.MILLISECONDS) > 50)
log.info("Difficulty transition traversal took {}", watch);
Block blockIntervalAgo = cursor.getHeader();
int timespan = (int) (prev.getTimeSeconds() - blockIntervalAgo.getTimeSeconds());
// Limit the adjustment step.
final int targetTimespan = this.getTargetTimespan();
if (timespan < targetTimespan / 4)
timespan = targetTimespan / 4;
if (timespan > targetTimespan * 4)
timespan = targetTimespan * 4;
BigInteger newTarget = Utils.decodeCompactBits(prev.getDifficultyTarget());
newTarget = newTarget.multiply(BigInteger.valueOf(timespan));
newTarget = newTarget.divide(BigInteger.valueOf(targetTimespan));
if (newTarget.compareTo(this.getMaxTarget()) > 0) {
log.info("Difficulty hit proof of work limit: {}", newTarget.toString(16));
newTarget = this.getMaxTarget();
}
int accuracyBytes = (int) (nextBlock.getDifficultyTarget() >>> 24) - 3;
long receivedTargetCompact = nextBlock.getDifficultyTarget();
// The calculated difficulty is to a higher precision than received, so reduce here.
BigInteger mask = BigInteger.valueOf(0xFFFFFFL).shiftLeft(accuracyBytes * 8);
newTarget = newTarget.and(mask);
long newTargetCompact = Utils.encodeCompactBits(newTarget);
if (newTargetCompact != receivedTargetCompact)
throw new VerificationException("Network provided difficulty bits do not match what was calculated: " +
Long.toHexString(newTargetCompact) + " vs " + Long.toHexString(receivedTargetCompact));
}
@Override
public Coin getMaxMoney() {
return MAX_MONEY;
}
@Override
public Coin getMinNonDustOutput() {
return Transaction.MIN_NONDUST_OUTPUT;
}
@Override
public MonetaryFormat getMonetaryFormat() {
return new MonetaryFormat();
}
@Override
public int getProtocolVersionNum(final ProtocolVersion version) {
return version.getBitcoinProtocolVersion();
}
@Override
public BitcoinSerializer getSerializer(boolean parseRetain) {
return new BitcoinSerializer(this, parseRetain);
}
@Override
public String getUriScheme() {
return BITCOIN_SCHEME;
}
@Override
public boolean hasMaxMoney() {
return true;
}
}
ここでの私の問題は、基本的にジェネシスブロックの生成です。正しいハッシュで偽造できません。zCashの chainparams.cpp で理解しようとしているトランザクションに関係していると思います。ただし、私のジェネシスブロック
e88b11fd3581e170f86db9c574f65c0ada3216e126011ac968869f1b64ea4c4aには、必要な代わりに
のハッシュがあります00040fe8ec8471911baa1db1266ea15dd06b4a8a5c453883c000b031973dce08
これは不可能であるという合理的な結論を含めて、あらゆる種類の助けに感謝します。