public static void main(String[] args) throws Exception {
NetworkParameters params = TestNet3Params.get();
// Bitcoinj supports hierarchical deterministic wallets (or "HD Wallets"):
// https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki
// HD wallets allow you to restore your wallet simply from a root seed. This seed can be
// represented using a short mnemonic sentence as described in BIP 39:
// https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki
// Here we restore our wallet from a seed with no passphrase. Also have a look at the
// BackupToMnemonicSeed.java example that shows how to backup a wallet by creating a mnemonic
// sentence.
String seedCode =
"yard impulse luxury drive today throw farm pepper survey wreck glass federal";
String passphrase = "";
Long creationtime = 1409478661L;
DeterministicSeed seed = new DeterministicSeed(seedCode, null, passphrase, creationtime);
// The wallet class provides a easy fromSeed() function that loads a new wallet from a given
// seed.
Wallet wallet = Wallet.fromSeed(params, seed);
// Because we are importing an existing wallet which might already have transactions we must
// re-download the blockchain to make the wallet picks up these transactions
// You can find some information about this in the guides:
// https://bitcoinj.github.io/working-with-the-wallet#setup
// To do this we clear the transactions of the wallet and delete a possible existing blockchain
// file before we download the blockchain again further down.
System.out.println(wallet.toString());
wallet.clearTransactions(0);
File chainFile = new File("restore-from-seed.spvchain");
if (chainFile.exists()) {
chainFile.delete();
}
// Setting up the BlochChain, the BlocksStore and connecting to the network.
SPVBlockStore chainStore = new SPVBlockStore(params, chainFile);
BlockChain chain = new BlockChain(params, chainStore);
PeerGroup peers = new PeerGroup(params, chain);
peers.addPeerDiscovery(new DnsDiscovery(params));
// Now we need to hook the wallet up to the blockchain and the peers. This registers event
// listeners that notify our wallet about new transactions.
chain.addWallet(wallet);
peers.addWallet(wallet);
DownloadProgressTracker bListener =
new DownloadProgressTracker() {
@Override
public void doneDownload() {
System.out.println("blockchain downloaded");
}
};
// Now we re-download the blockchain. This replays the chain into the wallet. Once this is
// completed our wallet should know of all its transactions and print the correct balance.
peers.start();
peers.startBlockChainDownload(bListener);
bListener.await();
// Print a debug message with the details about the wallet. The correct balance should now be
// displayed.
System.out.println(wallet.toString());
// shutting down again
peers.stop();
}
