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Adds the ANS-104 data item codec and the three-outcome recovery policy types for #26 (split 2/4). Continues #385 by @Gravirei. The 13 commits are carried over unchanged and keep their authorship; main was merged in as a separate commit.
Motivation & context
Reviewer 2 closed PR #224 on 2026-08-28 with a directive: split the work into four narrow PRs. This is Split PR 2.
The P1 finding the reviewer assigned to this split: the legacy anchor_item_present mapped BAD_REQUEST and GONE to Ok(false), and the recovery code interpreted false as permission to reclaim the row and pay for another upload. Neither 400 nor 410 proves a previously paid item was never accepted: 410 can describe an artifact that existed but is no longer served, and 400 can be produced by gateway, proxy, or routing failure. The concrete failure sequence the reviewer named: bundler accepts the item, the response or terminal DB write is lost, recovery probes the persisted item_id, the gateway returns 400 or 410, and the node pays for a second immutable item for the same transition.
Fix: model the probe result as three outcomes, and authorize a re-upload only on a trustworthy, protocol-defined absence.
Round-5 direction (reviewer 2): land here only the standard-compatible ANS-104 primitives and the pure three-outcome policy types. The gateway probe, the verify_anchor path, and the public verify endpoint are deferred until the uploader, retrieval proof, and recovery consumer can be proven as one vertical slice against a real provider contract (same-network upload/read pair, redirect-safe client, envelope-supplying read API, provider-documented absence evidence).
Breaking or protocol change (issue required first)
What changed
Crate touched: gitlawb-node (plus golden-vector scripts under scripts/).
New module ans104: ANS-104 data item (de)serialization, deep-hash matching arbundles@0.10.xgetSignatureData (8-element fold, verified byte-exact against the JS implementation), Ed25519 sign/verify (strict), full two-byte signature-type validation, raw-tag-payload preservation across parse/hash/encode. unit tests including a real arbundles-signed Ed25519 golden vector (verified without re-signing), multi-block and size-prefixed tag blocks, and a non-canonical-sigtype rejection test.
New module arweave_v2 (policy types only): the ProbeOutcome model the reviewer demanded — Present / DefinitivelyAbsent / Indeterminate — plus the permits_reupload rule, with a unit test. No gateway client, no endpoint.
Golden-vector scripts (scripts/ans104_golden_ed25519.mjs, output doc) capturing the interop fixture from the pinned arbundles dependency.
Deferred to the vertical slice (explicitly NOT in this PR): the gateway probe (probe_anchor_item), the verify_anchor path, GET /api/v1/arweave/anchors/verify/{item_id}, the irys_tx_id lookup method and index migration, and the gateway/rate-limit config knobs. There is therefore no provider response table here: DefinitivelyAbsent is authorized only by whatever evidence the future provider contract defines, and every ambiguous response stays retryable.
dataitem_matches_arbundles_golden_vector — real arbundles-signed Ed25519 item: shape pin, id pin, deep-hash pin against getSignatureData, verify without re-signing against an independently pinned expected key, byte-exact binary round-trip.
signed_binary_parse_and_verify_multi_block_and_negative_count — non-canonical tag encodings hash the original payload bytes and verify without re-signing.
decode_tags_accepts_negative_block_count_with_size — legal size-prefixed Avro form parses.
from_binary_rejects_non_canonical_signature_type_high_byte — wire 02 01 (258) is rejected, never aliased onto Ed25519 type 2.
binary_round_trip — signature slot, canonical owner, and payload survive to_binary/from_binary with the signature intact (no re-sign after parse).
external_reference_vectors (3 tests) — SHA-384 deep-hash primitives against the reference suite.
crates/gitlawb-node/src/arweave_v2.rs::tests:
only_definitively_absent_authorizes_reupload — the policy: collapsing any ambiguous outcome to absent spends a second immutable upload for the same transition.
Each test names the invariant it pins. Reverting the covered line turns the assertion red.
Before you request review
Scope is one logical change; no unrelated churn
cargo test --workspace passes locally (the ans104 filter passes on the merged tree; the full suite runs on CI)
New behavior is covered by tests (required for fixes)
cargo fmt --all and cargo clippy --workspace --all-targets -- -D warnings are clean
Commit titles use Conventional Commits (feat(...), fix(...), docs(...))
Docs / .env.example updated if behavior or config changed (N/A: no config or behavior change)
Checked existing PRs so this isn't a duplicate
Protocol & signing impact
Touches DID / did:key, Ed25519 / RFC 9421 signatures, UCAN, ref certs, or P2P wire formats
Discussed in an issue before implementation
Backward-compatible with existing nodes and previously signed history
Notes for reviewers
ProbeOutcome::permits_reupload is the policy the reviewer demanded: only DefinitivelyAbsent authorizes a paid re-upload. Indeterminate keeps the outbox non-terminal; the next probe (or a future retry) gets another chance to give a trustworthy answer. The exact evidence that establishes DefinitivelyAbsent is defined by the provider contract in the vertical slice that introduces the probe — never by a mock-only body shape.
Why this is its own PR
PR 2 owns ANS-104 serialization/verification and recovery outcome classification. The bundler upload itself (the handler that builds a DataItem and POSTs to the bundler), the provider-backed probe, and the public verification endpoint live in later slices. The ANS-104 module is fully tested and ready for the bundler upload to call into. PR 1's recovery drain consumes ProbeOutcome::permits_reupload; the probe that produces the outcome arrives with the provider contract.
… split 2/4)
Reviewer 2 closed PR #224 on 2026-08-28 with a directive: split
into four narrow PRs. This is Split PR 2 (Arweave transport and
verification).
The P1 finding the reviewer assigned to this split: the legacy
`anchor_item_present` mapped `BAD_REQUEST` and `GONE` to `Ok(false)`,
and the recovery code interpreted false as permission to reclaim the
row and pay for another upload. Neither 400 nor 410 proves a
previously paid item was never accepted: 410 can describe an
artifact that existed but is no longer served, and 400 can be
produced by gateway, proxy, or routing failure. The concrete
failure sequence the reviewer named: bundler accepts the item,
the response or terminal DB write is lost, recovery probes the
persisted item_id, the gateway returns 400 or 410, and the node
pays for a second immutable item for the same transition.
Fix: model the probe result as three outcomes, and authorize a
re-upload only on a trustworthy, protocol-defined absence.
NEW MODULE crates/gitlawb-node/src/ans104.rs
- DataItem: the on-wire ANS-104 shape (signature, owner, target,
anchor, tags, data — all base64url-encoded except target/anchor).
- deep_hash: the canonical signing input per the spec. The
signature is over a SHA-256 mix of the dataitem/list/map
discriminators, the signature type, owner, target, anchor, the
recursively-hashed tag list, and the data payload. A
hand-rolled sha256 of the JSON body would produce a hash no
Arweave gateway would recognize; the deep-hash is the only
correct form.
- sign_data_item: Ed25519 over deep_hash.
- verify_data_item: parses the owner, checks the signature against
an expected pubkey, and reports a specific failure reason on
each branch.
- 7 unit tests covering round-trip, flipped signature, wrong
expected key, mutated data, wire-shape round-trip, deep-hash
stability, and the empty-tags edge case.
NEW MODULE crates/gitlawb-node/src/arweave_v2.rs
- ProbeOutcome: Present (2xx, body parses as ANS-104, sig
verifies), DefinitivelyAbsent (404 with a known JSON body
shape), Indeterminate (everything else). The reviewer's
three-outcome model.
- ProbeOutcome::permits_reupload: the recovery policy. ONLY
DefinitivelyAbsent authorizes a paid re-upload. Indeterminate
keeps the outbox non-terminal; Present skips re-payment.
- probe_anchor_item: the gateway probe. 2xx bound to a different
item id is Indeterminate, not Present. 2xx with a body that
does not parse as ANS-104 is Indeterminate. Oversized bodies
are Indeterminate (defense against body-stuffing).
- read_capped_body: enforces PROBE_MAX_BODY_BYTES (1 MiB) on the
full body, with a Content-Length fast-path that rejects
before reading.
- verify_anchor: the full path the public verify endpoint takes.
Fetches the data item, parses it, verifies the Ed25519
signature against the persisted node_did, decodes the data
payload as JSON, and reports the result.
- 15 unit tests pinning each classification boundary:
400/410/5xx/transport/2xx-non-json/2xx-bad-sig/2xx-different-
owner are all Indeterminate; 404 with empty or known-JSON
body is DefinitivelyAbsent; 2xx with a valid signed item is
Present; the re-upload policy is exhaustive.
NEW DB METHOD crates/gitlawb-node/src/db/mod.rs
- get_arweave_anchor_by_item_id: looks up an existing
arweave_anchors row by its id (which is the Irys tx id, the
same value the Arweave gateway uses to serve the data item).
Used by the public verify endpoint to fetch the persisted
node_did so the envelope signature can be verified against it.
NEW CONFIG crates/gitlawb-node/src/config.rs
- GITLAWB_ARWEAVE_GATEWAY_URL: the Arweave gateway the probe
reads from. Defaults to https://arweave.net; operators can
point it at a private mirror.
NEW HTTP ENDPOINT crates/gitlawb-node/src/api/arweave.rs
- GET /api/v1/arweave/anchors/verify/{item_id}: the public
verify endpoint. Returns {item_id, status, verified,
owner_did, data_payload, error} where status is one of
"verified" / "definitively_absent" / "indeterminate".
- 3 endpoint-level tests covering the verified, 404, and 400
shapes via the live router, asserting the public surface
surfaces the three outcomes.
WIRE-UP crates/gitlawb-node/src/server.rs
- The verify route is registered alongside the existing
/api/v1/arweave/anchors list route.
NOT IN THIS SLICE (the bundler upload, the next commit):
- The handler that builds a DataItem from a ref-cert and POSTs
it to the bundler is not in this PR. The ANS-104 module is
ready to be called by it; the cert/push-event flow in PR 1
persists the row that the bundler upload would consume.
- PR 1's recovery drain produces an `anchor_jobs` row keyed on
the (repo, ref, old, new) tuple; the next slice reads that row,
builds the ANS-104 data item, POSTs to the bundler, and writes
the resulting tx id to arweave_anchors.
Compiles clean, 1113 tests pass with 0 regressions, clippy clean
under -D warnings, fmt clean.
Cross-PR overlap (declared in the PR description):
- #134 (anchors auth): composes. The verify endpoint reads from
arweave_anchors; #134's auth layer applies unchanged. The
probe model is server-side and unauthenticated by design.
- #285 (advisory-lock session affinity): independent. The probe
is read-only.
- #306 (Content-Digest on signed requests): independent. The
probe does not sign requests.
- #314 (small-order Ed25519): composes. The verify path calls
Did::to_verifying_key which already enforces the small-order
check from #314.
- #324 (libp2p keypair persistence): independent.
- #325 (gossip ref-update auth): independent. The verify path
is for the public Arweave gateway, not gossip.
- #382 (replication withheld-subtree trees): independent.
- P1 (DB lookup): get_arweave_anchor_by_item_id now filters on
irys_tx_id (the externally-routable item id) rather than the
internal UUID primary key. The production writer stores a fresh
UUID in `id` and the Irys response / ANS-104 derived id in
`irys_tx_id`; the old filter would always 404. New
integration tests exercise the production writer path with
distinct values for the two columns.
- P1 (verify-gate): verify_anchor now gates on repo read via
authorize_repo_read. The route is split in server.rs: the
public list_anchors stays ungated (#134 tracks that surface),
the verify route gets optional_signature per the team memory
`axum-layer-vs-merge-pitfall.md`. Denials on row-lookup, gate,
and missing repo all collapse to the same opaque 404 so the
public endpoint does not leak anchor-row existence.
- P1 (ANS-104 deep-hash): rewritten to the verified SHA-384
recursive list/blob algorithm (matches `arbundles` JS
reference). deep_hash returns [u8; 48]; signature is over the
raw 48-byte digest. Three reference vectors from
`Irys-xyz/arbundles/src/__tests__/deepHash.spec.ts` are
bit-exact-asserted as the interop canary per the team memory
`self-roundtrip-tests-do-not-prove-interop.md`.
- P1 (artifact-identity): v2 verify now derives the protocol id
via DataItem::id() (base64url(SHA256(signature))) and requires
equality with the requested URL item_id. A node key signs
many data items, so a valid signature only proves who signed
the response — not that the served item is the one the caller
asked to verify. The team memory
`verify-against-artifact-id-not-signer.md` is the policy.
- P1 (verifier can't read this head's writes): verify_anchor
now accepts BOTH the v2 ANS-104 format and the v1 raw-JSON
shape the live path on this branch actually writes. The v1
path does a field-equality check on repo, ref_name, old_sha,
new_sha, node_did against the persisted row (no signature in
v1; Irys storage plus the JSON parse are the integrity
guarantee).
- P2 (ProbeOutcome in result): AnchorVerifyResult now carries
outcome: ProbeOutcome. The HTTP handler maps the structured
field to the status string instead of parsing the human-
readable error message — any future wording change in
arweave_v2.rs can no longer silently reclassify a
DefinitivelyAbsent as Indeterminate.
- P2 (empty 404 body): classify_404 returns Indeterminate for
bodyless 404s. The team memory
`distinguish-unknown-from-empty.md` is the policy: a
bodyless 404 from a proxy is not a proof of absence, and the
recovery policy (permits_reupload -> true on
DefinitivelyAbsent) authorizes a paid, irreversible re-upload.
- P2 (streaming cap): read_capped_body no longer uses
resp.bytes() (which buffers the full response before checking
size). It now reads chunk-by-chunk and aborts the moment the
cumulative byte count crosses the cap, so a chunked response
without Content-Length cannot force unbounded allocation.
No actionable comments were generated in the recent review.
Walkthrough
The node adds ANS-104 data-item construction, parsing, encoding, deep hashing, Ed25519 signing, and verification. It also adds an Arweave probe outcome type that permits re-upload only after definitive absence, with reference scripts, tests, and endpoint comments.
Changes: ANS-104 data items
Layer / File(s)
Summary
Data-item shape and binary encoding crates/gitlawb-node/src/ans104.rs, crates/gitlawb-node/src/main.rs
The node defines ANS-104 data-item types and signature widths. It parses and encodes binary frames and Avro tags, preserves parsed tag bytes, and validates field widths and frame structure.
Deep hashing and Ed25519 operations crates/gitlawb-node/src/ans104.rs
The module computes recursive SHA-384 deep hashes. Signing sets the signature type before hashing, then stores the Ed25519 signature. Verification checks the signature type, signature length, owner key, and signature.
Reference vectors and validation crates/gitlawb-node/src/ans104.rs, scripts/ans104_golden.mjs, scripts/ans104_golden_ed25519.mjs, scripts/ans104_golden_output.txt, scripts/package.json
Rust tests cover parsing, round-trips, hashes, and signatures. Scripts create fixed ANS-104 items and check their IDs. The captured Ed25519 vector records binary and verification checks.
ProbeOutcome distinguishes present, definitively absent, and indeterminate results. Only definitive absence permits re-upload. A unit test checks this rule. Route comments describe deferred verification and probe work.
sequenceDiagram
participant Caller
participant sign_data_item
participant DataItem
participant Ed25519Keypair
Caller->>sign_data_item: item and keypair
sign_data_item->>DataItem: set signature type and compute deep hash
sign_data_item->>Ed25519Keypair: sign deep hash
Ed25519Keypair-->>sign_data_item: encoded signature
sign_data_item->>DataItem: store signature
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Suggested reviewers:kevincodex1
Merge Risk: Minimal · up to 4185f
This change adds an ANS-104 data-item codec and a re-upload policy type that no runtime path uses yet, so production behavior does not change. Earlier review findings are fixed, and no merge-blocking risk remains.
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crates/gitlawb-node/src/ans104.rs
crates/gitlawb-node/src/arweave_v2.rs
crates/gitlawb-node/src/main.rs
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scripts/ans104_golden.mjs
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Actionable comments posted: 1
Additional comments: 1
scripts/package.json-6-7: 1
6-7: Minor · Stability & Availability · Quick win
Unverified finding
Verification ran but could not confirm this finding. It is shown for review, not as a verified issue.
Declare the scripts’ direct dependencies.
Both scripts import base64url. The Ed25519 script also imports bs58 and @noble/ed25519. With pnpm or an isolated npm install, these transitive dependencies are not available to the scripts, so vector generation fails with ERR_MODULE_NOT_FOUND. Declare compatible versions directly. (pnpm.io)
Fix comments: Fix CodeRabbit comments on this PR
Prompt to fix all issues
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @crates/gitlawb-node/src/ans104.rs:
- Around line 391-394: Validate `raw_tags` against the decoded `self.tags`
before using it in `deep_hash` or `to_binary`, and reject mismatches so signing
and verification cannot accept stale tag bytes. Use the validated decoded tags
to determine the serialized header count, while preserving the existing encoding
path when `raw_tags` is absent.
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crates/gitlawb-node/src/ans104.rs
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crates/gitlawb-node/src/main.rs
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Actionable comments posted: 1
Fix comments: Fix CodeRabbit comments on this PR
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.
Inline comments:
Review comments at @crates/gitlawb-node/src/ans104.rs:
- Around line 371-385: Update deep_hash and to_binary to strictly decode
base64url target and anchor values, remove the verbatim-byte anchor fallback,
and reject nonempty decoded values that are not 32 bytes so sign_data_item
cannot sign fields that serialization rejects. Clarify in new_unsigned’s
documentation that target and anchor must be empty or base64url-encoded 32-byte
values.
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crates/gitlawb-node/src/ans104.rs
crates/gitlawb-node/src/arweave_v2.rs
crates/gitlawb-node/src/main.rs
crates/gitlawb-node/src/server.rs
scripts/ans104_golden.mjs
scripts/ans104_golden_ed25519.mjs
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I found issues that need to be addressed before this is ready.
Merge readiness
Branch policy: GitHub reports merge state BLOCKED (typical required-review gate). The branch is not stale relative to main: merge-base and live target are both 911be4d9fef309e56117440d21e5dad7718be666 at head c97c6447c3808720dc91920df3fbf6388ff95933. No rebase conflict risk identified on this diff.
PR checklist: The author left cargo test --workspace unchecked locally; CI test (stable), test (beta), fmt + clippy, build --release, and MSRV completed successfully on the latest run reviewed.
CodeRabbit: Full review completed; one inline note on raw_tags/tags is incorporated in the P2 finding below.
Overlap: Rehomes closed #385; composes with #384 / #386 per description. No duplicate open PR for this slice.
Scope boundary (not findings)
These were investigated and withheld so this review stays on split 2/4 (codec + policy types), not the deferred vertical slice or unrelated main debt:
verify_data_item must compare DataItem::id() to the URL item_id — artifact-id binding belongs in the future verify/probe path; the golden test asserts id separately by design. Not a merge-base regression.
JSON round-trip dropping raw_tags — binary frame is canonical on this PR; #[serde(skip)] is intentional unless this PR expands scope to JSON persistence of parsed gateway bodies.
Unbounded from_binary / frame caps — no production caller on this head; body limits ship with the deferred HTTP probe, not missing from main.
ProbeOutcome wiring to parse/verify errors — explicit deferral in PR body and arweave_v2.rs / server.rs comments.
Trailing bytes inside the Avro tag region — no stated repo contract requiring rejection; no interop failure demonstrated.
All items under Findings below are PR-introduced on this diff (new ans104, new scripts tree, new module docs). None ask for probe, verify endpoint, migrations, or core rewrites.
Merge gate summary: One behavioral fix (P2) before the bundler/probe slice can safely call this API. Two P3 items are in-scope hygiene on files this PR already added (docs + scripts/package.json); fix them in the same pass if you touch those paths, not as a substitute for P2.
Findings
🟡 P2 — Keep tags and raw_tags consistent on every hash and encode path
💥 What fails: After from_binary, a caller can change item.tags (public field) while raw_tags still holds the original Avro bytes. Cryptography still succeeds, but displayed tags lie; re-encoding breaks the frame header.
// deep_hash prefers raw_tags unchangedlet tags_block:Vec<u8> = match&self.raw_tags{Some(raw) => raw.clone(),None => encode_tags_block(&raw_tags),};// to_binary writes tag COUNT from self.tags.len(), bytes from raw_tags
out.extend_from_slice(&(self.tags.len()asu64).to_le_bytes());
out.extend_from_slice(&(tags_block.len()asu64).to_le_bytes());
out.extend_from_slice(&tags_block);
This means:
verify_data_item can pass while item.tags no longer matches the signed tag bytes
to_binary can emit a header count that does not match the Avro payload when tags.len() diverges from raw_tags
🔎 Root cause: This PR introduces paired fields where raw_tags is authoritative for signing and encoding, but both fields stay publicly mutable with no invariant on the hash/encode paths the next slice will call.
📜 Stated contract:
The deep-hash folds these exact bytes (arbundles hashes rawTags as a flat blob), and to_binary re-emits them, so multi-block or size-prefixed encodings survive the parse/hash/encode path
(ans104.rs field documentation, in this PR)
🏷️ Attribution: PR-introduced — new module; behavior absent at merge-base.
📌 In this PR:
DataItem::deep_hash — uses raw_tags without checking decoded tags
DataItem::to_binary — mixes self.tags.len() with optional raw_tags body
verify_data_item — trusts deep_hash input above
Module/field docs — promise byte-exact tag preservation across parse/hash/encode
🔒 Unchanged on main: No prior DataItem type.
🔧 Required correction: On every path that reads raw_tags for hashing or encoding (deep_hash, to_binary, and any shared helper they call), fail closed if raw_tags is Some and its decoded tag pairs do not match self.tags (same count and semantic pairs), or clear/invalidate raw_tags when tags are mutated (document the rule in the module doc). Add a regression test that mutates tags after from_binary and asserts verify/hash/encode fail (or raw_tags is cleared) — not silent success.
🛠️ Author fix: Close the invariant on every row under In this PR in one pass: enforce or invalidate before hash/encode, align module doc wording for the chosen rule, and add the regression test. Do not patch only to_binary or only a comment.
🚫 Out of scope: Gateway probe, HTTP verify route, artifact-id check inside verify_data_item, or recovery consumer wiring (deferred slices).
🔵 P3 — Align module docs with Ed25519-only verify on this slice
📍 Where:crates/gitlawb-node/src/ans104.rs module comment (lines 85–88) vs verify_data_item.
💥 What fails: A reader assumes gateway verification works for a parsed sigtype-3 (Ethereum) frame because the module comment says the code “verifies any other supported type,” then hits a hard error from verify_data_item.
🔎 Root cause: This PR adds multi-sigtype parse widths and an Ed25519-only verify API without updating the top-level module claim.
📜 Stated contract:
parses/signs/verifies any other supported type through the binary frame
(in-diff module comment — inaccurate for verify on this head)
🏷️ Attribution: PR-introduced documentation only; not pre-existing main debt.
📌 In this PR:
Module-level doc block at top of ans104.rs
verify_data_item docstring (keep consistent with module doc)
🔒 Unchanged on main: N/A (new module).
🔧 Required correction: Rewrite the module comment (and tighten verify_data_item docs if needed) to state that binary parsing accepts spec sigtypes 1–4, while sign (sign_data_item) and verify (verify_data_item) on this slice are Ed25519 (sigtype 2) only; illustrative Ethereum golden output stays non-normative per scripts/ans104_golden_output.txt.
🛠️ Author fix: Update every in-diff operator surface that still implies multi-sigtype verify (module doc + any adjacent comments that repeat the claim) in one edit.
🚫 Out of scope: Implementing Ethereum/Arweave/Solana verify in this PR.
🔵 P3 — Declare direct npm dependencies for the Ed25519 golden script
📍 Where:scripts/package.json, scripts/ans104_golden_ed25519.mjs, scripts/ans104_golden_output.txt (regeneration path tied to module doc).
💥 What fails: A maintainer runs the documented regeneration path with a strict package manager or without hoisting transitive deps; node ans104_golden_ed25519.mjs fails to resolve base64url, bs58, or @noble/ed25519 even though arbundles is installed. (npm ci + the script succeed today via hoisting; the gap is reproducibility, not a current CI failure.)
🔎 Root cause: This PR adds scripts that import packages not listed as direct dependencies.
📜 Stated contract:
The pin for this shape is the test dataitem_matches_arbundles_golden_vector against a real arbundles-signed Ed25519 item captured in scripts/ans104_golden_ed25519.mjs.
(ans104.rs module documentation, in this PR)
🏷️ Attribution: PR-introduced scripts/ tree; not pre-existing.
🔒 Unchanged on main: No prior scripts/package.json.
🔧 Required correction: Add explicit dependencies entries for every top-level import in ans104_golden_ed25519.mjs (and ans104_golden.mjs if kept), refresh package-lock.json with npm install, and note in ans104_golden_output.txt that regen uses npm ci in scripts/.
🛠️ Author fix: Update package.json, lockfile, and operator doc together so the arbundles interop pin stays reproducible.
🚫 Out of scope: Adding a CI job for golden regen unless the repo already requires it elsewhere.
…ncode
DataItem keeps both the decoded `tags` and the original Avro `raw_tags`, both
public. After a parse, changing `tags` left deep_hash and verify_data_item
using the stale raw bytes, and to_binary wrote a header tag count that no
longer matched the payload, so the frame failed to parse back.
Take the tag block for hashing and encoding from one helper that decodes
`raw_tags` and requires it to equal `tags`, and fail closed otherwise. The
header count comes from the same validated pairs. Parsed multi-block and
size-prefixed items still re-encode byte-exact and keep their signatures.
deep_hash now also rejects a non-empty target or anchor that is not 32 bytes,
as to_binary already does, so sign_data_item fails instead of signing an item
that cannot be encoded. The legacy non-base64url anchor fallback is kept.
The module and signature-type docs now say binary parsing accepts sigtypes 1
to 4 while signing and verifying are Ed25519 only on this slice.
ans104_golden_ed25519.mjs imports bs58, @noble/ed25519 and base64url, and
ans104_golden.mjs imports base64url, but package.json listed only arbundles, so
they resolved only through hoisting. Declare them at the versions already
locked, update the lockfile root entry (no resolved version or hash changes),
and note the regeneration command in the golden output file.
[P2] Keep tags and raw_tags consistent on every hash and encode path
Fixed in 52df224, as in the inline reply: one shared helper fails closed unless raw_tags still decodes to exactly tags, deep_hash and to_binary both use it, and the header count comes from the validated pairs. The field and module docs now state the rule. The regression test mutates tags after from_binary and asserts hash, verify and encode all fail, and an untouched parsed item still verifies and round-trips byte-exact.
[P3] Align module docs with Ed25519-only verify on this slice
Fixed in 52df224. The SIGNATURE_TYPE_ED25519 comment now says binary parsing accepts the spec signature types (1 to 4), while sign_data_item and verify_data_item support Ed25519 (sigtype 2) only on this slice, and the Ethereum golden output is non-normative. Both function docs say the same.
[P3] Declare direct npm dependencies for the Ed25519 golden script
Fixed in 4185fb1. scripts/package.json now lists @noble/ed25519, base64url and bs58 next to arbundles, at the versions already in the lockfile, and the lockfile root entry matches; no resolved version or hash changed. The regeneration note (npm ci in scripts/, then the script) is in ans104_golden_output.txt, and after a clean npm ci the script still produces the pinned Ed25519 vector. I could not reproduce an actual resolution failure with the old file, since npm lays the packages out flat from the lockfile, so this closes the undeclared-import gap rather than a failing build.
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🟢 Thanks for the contribution. I do not see any actionable issues from my review.
Merge readiness
Prior review: jatmn requested changes on c97c6447 (tags/raw_tags invariant, Ed25519-only operator docs, npm direct deps). Head 4185fb1 addresses all three (52df224, 4185fb1); I rechecked the fixes on current code and tests.
GitHub merge state:BLOCKED with reviewDecision: CHANGES_REQUESTED reflects the earlier review on the old head, not new defects on 4185fb1. A fresh approving review (or dismissal/update of the prior request) is still required for branch policy.
Target branch: Live main is 911be4d9, same as merge-base; no stale-base or rebase conflict risk on this diff.
Checks (at review time): PR Checks fmt + clippy, test (stable), build --release, MSRV, cargo audit, Windows non-blocking test, and CodeQL JS/actions/rust completed SUCCESS on the run tied to this head. test (beta), Docker build smoke, CodeQL Swift, and CodeRabbit were still IN_PROGRESS when captured—reconfirm on GitHub before merge if your policy treats them as required gates.
PR checklist:cargo test --workspace remains unchecked locally; CI stable suite passed on GitHub.
Overlap: Rehomes #385; composes with split 1/3/4 per description; no duplicate open PR for this slice.
CodeRabbit: Latest pass on 4185fb1 reported no actionable comments; earlier inline items were incorporated in the author fix commits.
Scope boundary (not findings)
Investigated again on 4185fb1 and withheld so this review stays on codec + policy types:
Artifact-id check inside verify_data_item — belongs in the deferred verify/probe vertical slice; module doc describes that path separately from the Ed25519 verify helper shipped here.
JSON round-trip dropping raw_tags — intentional #[serde(skip)]; no in-diff JSON persistence path; binary frame is canonical on this PR.
Unbounded from_binary / allocation on hostile bodies — no production caller on this head; HTTP caps ship with the deferred probe.
ProbeOutcome mapping from gateway errors — no probe in this diff; policy enum only.
Trailing Avro bytes / arbundles-compatible tag slack — no demonstrated interop failure; wire bytes preserved for hashing.
Merge gate summary: No new code defects on this head. Resolve the outstanding review gate and any still-running required checks, then this slice looks ready to merge on scope.
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crate:nodegitlawb-node — the serving node and REST APIkind:bugDefect fix — wrong or unsafe behaviorsubsystem:storageBlob/object store, Arweave, IPFS, archives
3 participants
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Summary
Adds the ANS-104 data item codec and the three-outcome recovery policy types for #26 (split 2/4). Continues #385 by @Gravirei. The 13 commits are carried over unchanged and keep their authorship; main was merged in as a separate commit.
Motivation & context
Reviewer 2 closed PR #224 on 2026-08-28 with a directive: split the work into four narrow PRs. This is Split PR 2.
The P1 finding the reviewer assigned to this split: the legacy
anchor_item_presentmappedBAD_REQUESTandGONEtoOk(false), and the recovery code interpreted false as permission to reclaim the row and pay for another upload. Neither 400 nor 410 proves a previously paid item was never accepted: 410 can describe an artifact that existed but is no longer served, and 400 can be produced by gateway, proxy, or routing failure. The concrete failure sequence the reviewer named: bundler accepts the item, the response or terminal DB write is lost, recovery probes the persisted item_id, the gateway returns 400 or 410, and the node pays for a second immutable item for the same transition.Fix: model the probe result as three outcomes, and authorize a re-upload only on a trustworthy, protocol-defined absence.
Round-5 direction (reviewer 2): land here only the standard-compatible ANS-104 primitives and the pure three-outcome policy types. The gateway probe, the
verify_anchorpath, and the public verify endpoint are deferred until the uploader, retrieval proof, and recovery consumer can be proven as one vertical slice against a real provider contract (same-network upload/read pair, redirect-safe client, envelope-supplying read API, provider-documented absence evidence).Refs #26
Kind of change
What changed
Crate touched: gitlawb-node (plus golden-vector scripts under
scripts/).ans104: ANS-104 data item (de)serialization, deep-hash matchingarbundles@0.10.xgetSignatureData(8-element fold, verified byte-exact against the JS implementation), Ed25519 sign/verify (strict), full two-byte signature-type validation, raw-tag-payload preservation across parse/hash/encode. unit tests including a real arbundles-signed Ed25519 golden vector (verified without re-signing), multi-block and size-prefixed tag blocks, and a non-canonical-sigtype rejection test.arweave_v2(policy types only): theProbeOutcomemodel the reviewer demanded —Present/DefinitivelyAbsent/Indeterminate— plus thepermits_reuploadrule, with a unit test. No gateway client, no endpoint.scripts/ans104_golden_ed25519.mjs, output doc) capturing the interop fixture from the pinnedarbundlesdependency.Deferred to the vertical slice (explicitly NOT in this PR): the gateway probe (
probe_anchor_item), theverify_anchorpath,GET /api/v1/arweave/anchors/verify/{item_id}, theirys_tx_idlookup method and index migration, and the gateway/rate-limit config knobs. There is therefore no provider response table here:DefinitivelyAbsentis authorized only by whatever evidence the future provider contract defines, and every ambiguous response stays retryable.How a reviewer can verify
Full workspace suite runs on CI.
crates/gitlawb-node/src/ans104.rs::tests:dataitem_matches_arbundles_golden_vector— real arbundles-signed Ed25519 item: shape pin, id pin, deep-hash pin againstgetSignatureData, verify without re-signing against an independently pinned expected key, byte-exact binary round-trip.signed_binary_parse_and_verify_multi_block_and_negative_count— non-canonical tag encodings hash the original payload bytes and verify without re-signing.decode_tags_accepts_negative_block_count_with_size— legal size-prefixed Avro form parses.from_binary_rejects_non_canonical_signature_type_high_byte— wire02 01(258) is rejected, never aliased onto Ed25519 type 2.binary_round_trip— signature slot, canonical owner, and payload surviveto_binary/from_binarywith the signature intact (no re-sign after parse).sign_then_verify_round_trips,flipped_signature_byte_fails_verify,wrong_expected_pubkey_fails_verify,mutated_data_fails_verify,wire_shape_round_trip,deep_hash_is_stable,deep_hash_empty_tags_is_distinct_from_one_tag,data_item_id_is_base64url_of_sha256_of_signature— round-trip, tamper, and derivation pins.external_reference_vectors(3 tests) — SHA-384 deep-hash primitives against the reference suite.crates/gitlawb-node/src/arweave_v2.rs::tests:only_definitively_absent_authorizes_reupload— the policy: collapsing any ambiguous outcome to absent spends a second immutable upload for the same transition.Each test names the invariant it pins. Reverting the covered line turns the assertion red.
Before you request review
cargo test --workspacepasses locally (theans104filter passes on the merged tree; the full suite runs on CI)cargo fmt --allandcargo clippy --workspace --all-targets -- -D warningsare cleanfeat(...),fix(...),docs(...)).env.exampleupdated if behavior or config changed (N/A: no config or behavior change)Protocol & signing impact
did:key, Ed25519 / RFC 9421 signatures, UCAN, ref certs, or P2P wire formatsNotes for reviewers
ProbeOutcome::permits_reuploadis the policy the reviewer demanded: onlyDefinitivelyAbsentauthorizes a paid re-upload.Indeterminatekeeps the outbox non-terminal; the next probe (or a future retry) gets another chance to give a trustworthy answer. The exact evidence that establishesDefinitivelyAbsentis defined by the provider contract in the vertical slice that introduces the probe — never by a mock-only body shape.Why this is its own PR
PR 2 owns ANS-104 serialization/verification and recovery outcome classification. The bundler upload itself (the handler that builds a DataItem and POSTs to the bundler), the provider-backed probe, and the public verification endpoint live in later slices. The ANS-104 module is fully tested and ready for the bundler upload to call into. PR 1's recovery drain consumes
ProbeOutcome::permits_reupload; the probe that produces the outcome arrives with the provider contract.Overlap with open PRs
Safety to land standalone
arweave_anchorstable is untouched.main.rs/server.rsmodule wiring and a comment.Summary by CodeRabbit