test(batch): pin that the emitted blob carries normalised inner transactions by Platonenkov · Pull Request #158 · StaticBit-io/XrplCSharp

Platonenkov · 2026-08-31T16:49:38Z

First of the two steps agreed in #157. This one only adds a test; it changes no production code, and passes on dev as it stands.

Why

Batch signing does three things in a row: it normalises each inner transaction, hashes the results into the batch preimage, and encodes the outer transaction into the blob. The first and third are joined by nothing but aliasing — NormalizeInnerTransaction rewrites the objects that live inside outer, which is what XrplBinaryCodec.Encode(outer) later serialises:

normalizedInners.Add(innerTx.NormalizeInnerTransaction());   // also rewrites outer's RawTransactions
...
var txIds = normalizedInners.Select(BatchNormalizer.ComputeInnerTxId).ToList();
...
string signedHex = XrplBinaryCodec.Encode(outer);

Nothing pinned that. The batch fixture hands in inner transactions that already carry Fee = "0", SigningPubKey = "" and tfInnerBatchTxn, so normalisation is a no-op on them and every batch test passes whether the normaliser mutates its argument or returns a copy.

That is not hypothetical. Making the normaliser clone its argument — the obvious defensive change, and the one first proposed in #157 — leaves all 1215 unit tests green while the emitted blob carries inner transactions the signature never committed to:

DECODED INNER: {"TransactionType":"Payment","Sequence":1,"Amount":"1000000","Account":"rGQ…","Destination":"r9A…"}

No Fee, no SigningPubKey, no Flags — while the txIDs in the preimage were computed over the normalised copies.

What this adds

TestUSignAsBatchPart_EmittedBlobCarriesNormalizedInnerTransactions signs a batch whose inner transaction carries none of those three fields, decodes the blob, and asserts they are present — then asserts that the decoded transaction hashes to the txID the signature was made over, which is what the three fields are for.

A second fixture, UnnormalizedInnerPayment, supplies that input. The existing InnerPayment is left alone: a pre-normalised inner transaction is a legitimate input and other tests rely on it.

Verification

Verified by mutation: making the normaliser clone its argument fails this test on the emitted Fee; reverting makes it pass. The mutation was reverted — the diff is the test alone.
Full unit suite: 1216 passed, 0 failed.

One note on the test itself. The first version read Flags with TryGetValue<long> and treated failure as zero, which failed against correct code: the node arrives as JsonValuePrimitive, for which that call simply returns false, while the blob carried Flags: 1073741824 all along. It now reads through the JSON text and fails loudly when the field is absent, rather than reporting a missing flag on a blob that has one.

Summary by CodeRabbit

Tests
- Added coverage for batch-signing output to verify that inner transactions are normalized consistently.
- Confirmed required default fields, batch-signing indicators, and transaction identifiers are correctly represented in emitted signing data.

…actions Batch signing normalises each inner transaction, hashes the results into the batch preimage, and encodes the outer transaction into the blob. The first and third steps are joined by nothing but aliasing: normalisation rewrites the objects that live inside the object being encoded, and the call site reads as though it only collects a list for the txIDs. Nothing pinned that. The existing fixture hands in inner transactions that already carry Fee = "0", SigningPubKey = "" and tfInnerBatchTxn, so normalisation is a no-op on them and every batch test passes whether the normaliser mutates its argument or returns a copy. Making it return a copy leaves all 1215 unit tests green while the blob goes out carrying inner transactions the signature never committed to. This signs a batch whose inner transaction carries none of those three fields, decodes the resulting blob, and asserts they are there - then checks that the decoded transaction hashes to the txID the signature was made over, which is what the three fields are for. Verified by mutation: making the normaliser clone its argument fails this test on the emitted Fee, and reverting makes it pass. The Flags reading goes through the JSON text on purpose. The node came back as JsonValuePrimitive, for which TryGetValue<long> simply returns false - a reader that treated that as zero reported an absent flag on a blob that carried it.

Platonenkov · 2026-08-31T16:49:45Z

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Tests/Xrpl.Tests/Wallet/TestUBatchSigningV11.cs

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Walkthrough

The pull request adds a batch-signing test for unnormalized inner payments. The test verifies normalized fields, the inner-batch flag, the normalized transaction ID, and the signature preimage.

Changes

Batch signing normalization

Layer / File(s)	Summary
Normalized inner-payment signing test `Tests/Xrpl.Tests/Wallet/TestUBatchSigningV11.cs`	Adds culture-invariant flag parsing, an unnormalized inner-payment fixture, and coverage for normalized fields, the inner-batch flag, the normalized transaction ID, and the signature preimage.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 58a7a

This PR adds a focused regression test for normalized inner transactions without changing production behavior; no actionable merge-blocking risk remains after normal checks and review.

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Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding a batch-signing regression test for normalized inner transactions in the emitted blob.
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Inline comments:
In `@Tests/Xrpl.Tests/Wallet/TestUBatchSigningV11.cs`:
- Around line 260-262: Extend the test around SignAsBatchPart to extract the
emitted TxnSignature and verify it against the normalized inner transaction
preimage identified by signedTxId. Keep the existing ComputeInnerTxId equality
assertion, and mirror the verification approach used by the existing
single-signature test to ensure the signature covers the normalized ID.

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… txIDs The assertions so far show the blob carries normalised inner transactions and that they hash to a txID computed here. They say nothing about which txIDs went into the preimage the signature was made over. That leaves a regression uncovered: hash the originals into the preimage while still writing the normalised form into the blob, and every existing assertion holds. Verified by mutation - computing the txIDs from a clone taken before normalisation fails only the new assertion and leaves the other four green.

Platonenkov · 2026-08-31T16:54:36Z

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coderabbitai · 2026-08-31T16:54:44Z

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Comment thread Tests/Xrpl.Tests/Wallet/TestUBatchSigningV11.cs

Platonenkov mentioned this pull request Aug 31, 2026

fix(batch)!: NormalizeInnerTransaction returns a copy instead of rewriting its argument #159

Merged

Platonenkov added this pull request to the merge queue Aug 31, 2026

Merged via the queue into dev with commit fe1c921 Aug 31, 2026
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This was referenced Aug 31, 2026

NormalizeInnerTransaction mutates the caller's JsonObject #157

Closed

GetBatchSignerAccounts rewrites the dictionary it is given #161

Closed

Platonenkov deleted the claude/batch-blob-normalization-test-8fd79c branch September 1, 2026 14:51

Platonenkov mentioned this pull request Sep 1, 2026

Release 11.2.0.0 #164

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test(batch): pin that the emitted blob carries normalised inner transactions - #158

test(batch): pin that the emitted blob carries normalised inner transactions#158
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What this adds

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