AbstractTransaction

Abstract base class for transaction classes.

Stellar supports two types of transactions:

• Transaction - Standard transaction containing operations

• FeeBumpTransaction - Transaction that wraps another transaction to bump its fee

This abstract class provides common functionality for signing, hashing, and serializing transactions.

Transaction Lifecycle

1. Build - Create transaction using TransactionBuilder

2. Sign - Add signatures using sign() methods

3. Serialize - Convert to XDR for network submission

4. Submit - Send to Horizon or RPC server

Signing

Transactions must be signed by the source account and any other required signers. Signatures are added using the sign() methods:

val transaction = TransactionBuilder(...)
    .build()

// Sign with keypair
transaction.sign(keypair)

// Sign with hash(x) preimage
transaction.signHashX(preimage)

Network Passphrase

Each transaction is tied to a specific network (PUBLIC, TESTNET, etc.) through its network passphrase. The network ID (SHA-256 hash of passphrase) is included in the transaction hash to prevent replay attacks across different networks.

See also

Inheritors