Key APIs

Account account = new Account();   //Create a Mainnet account

Account account = new Account(Networks.mainnet());   //Create a Mainnet account

Account account = new Account(Networks.testnet());  //Create a Testnet account

String baseAddress = account.baseAddress();  //Base address at index=0

String enterpriseAddress = account.account.enterpriseAddress();  //Enterprise address at index = 0

String mnemonic = account.mnemonic();  //Get Mnemonic

String mnemonic = "...";
Account account = new Account(mnemonic);  //Create a Mainnet account from Mnemonic

Account account = new Account(Networks.testnet(), mnemonic); //Create a Testnet account from Mnemonic

BackendService backendService =
                new BFBackendService(Constants.BLOCKFROST_TESTNET_URL, <BF_PROJECT_ID>);

FeeCalculationService feeCalculationService = backendService.getFeeCalculationService();
TransactionHelperService transactionHelperService = backendService.getTransactionHelperService();
TransactionService transactionService = backendService.getTransactionService();
BlockService blockService = backendService.getBlockService();
AssetService assetService = backendService.getAssetService();
UtxoService utxoService = backendService.getUtxoService();
MetadataService metadataService = backendService.getMetadataService();
EpochService epochService = backendService.getEpochService();
AddressService addressService = backendService.getAddressService();

Tx tx1 = new Tx()
        .payToAddress(receiver1Addr, Amount.ada(1.5))
        .payToAddress(receiver2Addr, Amount.ada(2.5))
        .attachMetadata(MessageMetadata.create().add("This is a test message 2"))
        .from(sender1Addr);
 
Tx tx2 = new Tx()
        .payToAddress(receiver2Addr, Amount.ada(4.5))
        .from(sender2Addr);
 
QuickTxBuilder quickTxBuilder = new QuickTxBuilder(backendService);
Result<String> result = quickTxBuilder
        .compose(tx1, tx2)
        .feePayer(sender1Addr)
        .withSigner(SignerProviders.signerFrom(sender1))
        .withSigner(SignerProviders.signerFrom(sender2))
        .completeAndWait(System.out::println);
 

//Define expected outputs
Output output1 = Output.builder()
        .address(receiverAddress1)
        .assetName(LOVELACE)
        .qty(adaToLovelace(10))
        .build();
 
 Output output2 = Output.builder()
        .address(receiverAddress2)
        .assetName(LOVELACE)
        .qty(adaToLovelace(20))
        .build();
 
 // Create a CIP20 message metadata
 MessageMetadata metadata = MessageMetadata.create()
                    .add("First transfer transaction");
 
 // Define TxBuilder
 TxBuilder txBuilder = output1.outputBuilder()
        .and(output2.outputBuilder())
        .buildInputs(createFromSender(senderAddress, senderAddress))
        .andThen(metadataProvider(metadata))
        .andThen(balanceTx(senderAddress, 1));
 
 UtxoSupplier utxoSupplier = new DefaultUtxoSupplier(backendService.getUtxoService());
 ProtocolParamsSupplier protocolParamsSupplier = new DefaultProtocolParamsSupplier(backendService.getEpochService());
 
 //Build and sign the transaction
 Transaction signedTransaction = TxBuilderContext.init(utxoSupplier, protocolParamsSupplier)
                            .buildAndSign(txBuilder, signerFrom(senderAccount));
 //Submit the transaction
 Result<String> result = backendService.getTransactionService().submitTransaction(signedTransaction.serialize());

Example: 1

ScriptPubkey scriptPubkey = new ScriptPubkey("ad7a7b87959173fc9eac9a85891cc93892f800dd45c0544128228884")
String policyId = scriptPubkey.getPolicyId();

Example: 2

ScriptPubkey scriptPubkey1 = ...;
SecretKey sk1 = ...;

ScriptPubkey scriptPubkey2 = ...;
SecretKey sk2 = ...;

ScriptPubkey scriptPubkey3 = ...;
SecretKey sk3 = ...;

ScriptAtLeast scriptAtLeast = new ScriptAtLeast(2)
                .addScript(scriptPubkey1)
                .addScript(scriptPubkey2)
                .addScript(scriptPubkey3);

String policyId = scriptAtLeast.getPolicyId();

MetadataMap productDetailsMap = MetadataBuilder.createMap()
                .put("code", "PROD-800")
                .put("slno", "SL20000039484");

MetadataList tagList = MetadataBuilder.createList()
                .add("laptop")
                .add("computer");

Metadata metadata = MetadataBuilder.createMetadata()
                .put(new BigInteger("670001"), productDetailsMap)
                .put(new BigInteger("670001"), productDetailsMap);