- Still required for the transaction to succeed (except inside a Batch,
because the batch signers take care of that).
- Started adding tests for Loan-related RPC and low-level math checks.
Currently only implemented "sign" on a LoanSet to verify it can be
done.
- Addresses FIND-001 from audit
- LoanSet::preflight will require Counterparty to be set (it's normally
optional) for an inner batch transaction, because the checks are done
before the LoanBroker object can be accessed.
- Adjust LoanSet::calculateBaseFee to not charge extra if an inner
transaction.
- Adds a Loan-specific test to Batch_test.
The tests that ensure `tfInnerBatchTxn` won't block delegated transactions silently fail in `Delegate_test.cpp`. This change removes these cases from that file and adds them to `Batch_test.cpp` instead where they do not silently fail, because there the batch delegate results are explicitly checked. Moving them to that file further avoids refactoring many helper functions.
- Specification: [XRPLF/XRPL-Standards 56](https://github.com/XRPLF/XRPL-Standards/blob/master/XLS-0056d-batch/README.md)
- Amendment: `Batch`
- Implements execution of multiple transactions within a single batch transaction with four execution modes: `tfAllOrNothing`, `tfOnlyOne`, `tfUntilFailure`, and `tfIndependent`.
- Enables atomic multi-party transactions where multiple accounts can participate in a single batch, with up to 8 inner transactions and 8 batch signers per batch transaction.
- Inner transactions use `tfInnerBatchTxn` flag with zero fees, no signature, and empty signing public key.
- Inner transactions are applied after the outer batch succeeds via the `applyBatchTransactions` function in apply.cpp.
- Network layer prevents relay of transactions with `tfInnerBatchTxn` flag - each peer applies inner transactions locally from the batch.
- Batch transactions are excluded from AccountDelegate permissions but inner transactions retain full delegation support.
- Metadata includes `ParentBatchID` linking inner transactions to their containing batch for traceability and auditing.
- Extended STTx with batch-specific signature verification methods and added protocol structures (`sfRawTransactions`, `sfBatchSigners`).
