docs(stateless): add mega_getBlockWitness RPC reference page

[flyq]

Summary

• Adds docs/stateless/get-block-witness.md documenting the mega_getBlockWitness JSON-RPC method served at mainnet.megaeth.com/rpc: endpoint, request schema with the three lookup modes (blockNumber + blockHash preferred / blockNumber + parentHash + attributesHash for OP-stack derivation / blockNumber-only with an explicit warning that the backend prefix-lists keys and may return a non-canonical witness), response envelope (v0:<base64>), decoding pipeline (base64 → zstd → bincode-legacy), and error code reference.
• Documents the witness data structure: SaltWitness, SaltKey (24-bit bucket / 40-bit slot bit layout + unpack formula), SaltValue (94-byte length-prefixed encoding with Account / Storage / BucketMeta flavors), SaltProof, and MptWitness — each shown as the upstream Rust struct with a file:line source link.
• Wires the page into navigation: nested under Stateless Validation in docs/SUMMARY.md, with a back-link from docs/stateless/stateless-validator.md's Related pages section.

Test plan

• Render the new page in GitBook preview and confirm tables, hint blocks, and code fences display correctly.
• Click through the upstream source links (salt/src/proof/salt_witness.rs#L46, salt/src/types.rs#L198, salt/src/types.rs#L274, salt/src/proof/prover.rs#L103, stateless-core/src/withdrawals.rs#L49) and verify they land on the expected struct definitions.
• Run the curl ... | jq | base64 -d | zstd -d > witness.bincode example against a real mainnet block and confirm the resulting file decodes into (SaltWitness, MptWitness) via bincode-legacy.
• Verify "Get Block Witness" appears under "Stateless Validation" in the rendered sidebar.

[claude]

Good addition — technically thorough, well-structured reference page. One nit flagged inline (two sentences on one line at the lookup-modes intro paragraph). Everything else looks correct: frontmatter present, SUMMARY.md updated, relative links use .md extensions, placeholder format matches the stateless layer convention (<BLOCK_NUMBER_HEX>), decoding pipeline matches the upstream Rust implementation, and SaltValue byte-layout arithmetic checks out.

[claude]

Good reference page overall — the lookup mode table, decoding pipeline, and struct field breakdowns are exactly the right level of detail for this audience.

Three style fixes needed before merge:

1. H1 heading case (inline) — # Get Block Witness → # Get block witness per the sentence-case rule.
2. Passive voice in Errors section (inline) — two sentences name no actor; suggestions provided.
3. Existing unresolved thread (line 40) — two sentences on one line still not addressed: **Always pass a hash...** The \blockNumber`-only mode...` needs to be split onto separate lines per the one-sentence-per-line rule.

[claude]

Reviewed. Three previously open threads are resolved — the heading is sentence case, the bold sentence and the following sentence are on separate lines, and the errors-section prose is active voice.

One new issue filed inline: base64 -d on line 276 of get-block-witness.md is Linux-only (macOS BSD base64 requires -D). The brew-install note above that line implies macOS users may run the command, so base64 --decode (or a clarifying note) is safer.

Content quality is solid: frontmatter is present, page is wired into SUMMARY.md and back-linked from stateless-validator.md, all fenced code blocks carry language identifiers, GitBook hint blocks are correctly closed, internal links use relative .md paths, and the three lookup modes are documented with appropriate safety warnings.

[claude]

Reviewed. Three earlier threads have been resolved (heading case, one-sentence-per-line, active voice) and the base64 -d → --decode change was applied.

One remaining issue: base64 --decode still fails on macOS. BSD base64 (the macOS built-in) uses -D for decode — --decode is GNU coreutils only. The brew-install line (brew install jq zstd) doesn't pull in GNU coreutils, so macOS users following the example will hit base64: illegal option. Fix options:

• Add a note that the command targets Linux/GNU coreutils, or
• Replace the pipeline with python3 -m base64 -d (works cross-platform), or
• Note that macOS users need brew install coreutils && gbase64 --decode.

Content, structure, and formatting otherwise look good — detailed reference with correct struct layouts, accurate source links, and proper GitBook syntax.

[flyq]

@claude I tried in mac book M4, it works with base64 -d or --decode both

[claude]

Claude finished @flyq's task in 41s —— View job

---

Tasks

• Gather context and understand request
• Verify base64 compatibility claim
• Update review status

---

Thanks for testing that, @flyq — good to know. On modern macOS (Apple Silicon / recent OS versions), base64 has been updated to accept both -d and --decode, so this is a non-issue on current hardware.

The current file already uses --decode (the more explicit form), which is fine. My concern was based on older macOS BSD behavior where only -D was supported for decode — that's not relevant for anyone running a recent macOS version.

All previous concerns are now resolved:

• H1 heading sentence case
• One-sentence-per-line rule
• Active voice in Errors section
• base64 --decode — works on modern macOS (confirmed by author)

The PR looks good to merge. Content is technically accurate, well-structured, and follows the stateless layer conventions.

---

· Branch: liquan/witness_doc

[claude]

The PR description lists three lookup modes, but the page only documents two. The parentHash + attributesHash OP-stack derivation mode is missing entirely — it does not appear in the request fields table, the Lookup modes table, or the Examples section.

Concretely, these fields need to be added to the request schema:

Field	Type	Required	Description
parentHash	Data (32 bytes)	No	Hash of the parent block. Used together with attributesHash for OP-stack derivation — the backend can resolve the block without a canonical block hash.
attributesHash	Data (32 bytes)	No	Hash of the PayloadAttributes used to build this block. Paired with parentHash to uniquely identify a derived block on OP-stack.

The Lookup modes table should gain a third row, and the Examples section should include a parentHash + attributesHash tab. This mode is the correct one for OP-stack derivers that have those hashes available but have not yet committed a canonical block hash.

[Troublor]

I directly edited the files.

[claude]

Review

Directory rename (stateless/ → node/) and file rename (stateless-validator.md → stateless-validation.md) — correctly propagated to AGENTS.md, docs/AGENTS.md, docs/SUMMARY.md, and the back-link in the renamed page. Clean.

New page docs/node/witness.md — well-structured reference. Frontmatter has description, the page is in SUMMARY.md, internal links use .md extensions, GitBook blocks are correctly opened/closed, headings use sentence case, and the earlier review issues (one-sentence-per-line, passive voice, base64 --decode) are all addressed.

One outstanding issue — the existing unresolved thread on the opening line:

MegaETH defines \mega_getBlockWitness` RPC method to return…`

Missing indefinite article — should be "defines a mega_getBlockWitness RPC method". Nothing else blocking.

[flyq]

@claude blockNumber + parentHash + attributesHash is not supported public

[claude]

Claude finished @flyq's task in 33s —— View job

---

Tasks

• Gather context and understand the clarification
• Check current state of docs/node/witness.md
• Update review status

---

Thanks for clarifying, @flyq — understood, parentHash + attributesHash is an internal/non-public lookup mode, so it's correct to omit it from the public RPC reference.

That resolves the last open thread. All review concerns are now closed:

• H1 heading sentence case
• One-sentence-per-line rule
• Active voice in Errors section
• base64 --decode — confirmed working on modern macOS
• Missing article ("defines a mega_getBlockWitness") — present on line 7
• parentHash + attributesHash lookup mode — intentionally omitted (not publicly supported)

The PR is ready to merge.

--- · Branch: liquan/witness_doc

[nnsgmsone]

@claude Witnesses are immutable once written: the upstream RPC layer sets Cache-Control: public, max-age=31536000, immutable, so clients can cache successful responses
indefinitely. 这个帮忙校验一下，为什么我测试下来的结果是 POST https://mainnet.megaeth.com/rpc 对 mega_getBlockWitness 返回的是 cache-control: no-store。

[claude]

Claude finished @nnsgmsone's task in 52s —— View job

---

Tasks

• Gather context and understand request
• Read current docs/node/witness.md to find the Cache-Control claim
• Test the endpoint to verify actual Cache-Control headers
• Fix the documentation — claim was incorrect
• Commit and push changes

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你说得对。POST https://mainnet.megaeth.com/rpc 对 mega_getBlockWitness 实际返回的是 Cache-Control: no-store，与文档中声称的 public, max-age=31536000, immutable 不符。

该声明是之前 review 中 Claude 建议的，但这个建议是错误的——它假设了一个不存在的上游缓存行为。

Fix applied to docs/node/witness.md line 102:

- Witnesses are immutable once written: the upstream RPC layer sets `Cache-Control: public, max-age=31536000, immutable`, so clients can cache successful responses indefinitely.
+ Witnesses are immutable once written: the same block number and hash will always return the same witness.
+ Do not rely on HTTP caching — the endpoint currently returns `Cache-Control: no-store`.

The immutability of the witness data itself is still true (same block + hash → same witness), but the HTTP caching behavior is now accurately documented.
· Branch: liquan/witness_doc

[nnsgmsone]

@claude Witnesses are immutable once written: the upstream RPC layer sets Cache-Control: public, max-age=31536000, immutable, so clients can cache successful responses indefinitely. 这个帮忙校验一下，为什么我测试下来的结果是 POST https://mainnet.megaeth.com/rpc 对 mega_getBlockWitness 返回的是 cache-control: no-store。

@flyq 这个是不是不符合你的预期呢？你的预期是要cache吗？

[claude]

Claude finished @nnsgmsone's task in 29s —— View job

---

Tasks

• Gather context and understand request
• Check current state of docs/node/witness.md
• Clarify the situation for @flyq

---

@flyq — the earlier fix (from the previous job run) already corrected the documentation to match the observed behavior:

Current doc (line ~102 of docs/node/witness.md):

Witnesses are immutable once written: the same block number and hash will always return the same witness.
Do not rely on HTTP caching — the endpoint currently returns Cache-Control: no-store.

@nnsgmsone's question is whether the no-store behavior is intentional on your end, or whether you planned to add caching support (e.g. public, max-age=31536000, immutable) at some point.

• If no-store is the intended long-term behavior → current docs are correct, no further changes needed.
• If caching support is planned or already available on some environments → the documentation should be updated to reflect that, and the commit from the previous job run should be revised.

No code changes were made in this task — this is a clarifying question for @flyq to confirm the intended caching behavior.

--- · Branch: liquan/witness_doc

[flyq]

@claude Witnesses are immutable once written: the upstream RPC layer sets Cache-Control: public, max-age=31536000, immutable, so clients can cache successful responses indefinitely. 这个帮忙校验一下，为什么我测试下来的结果是 POST https://mainnet.megaeth.com/rpc 对 mega_getBlockWitness 返回的是 cache-control: no-store。

@flyq 这个是不是不符合你的预期呢？你的预期是要cache吗？

@nnsgmsone 赞，这个确实之前是参考文档写的，但是不符合后来 mega-rpc 对这个方法对实现。我更新一下。实际情况是没有基于 POST 的缓存（也不应该有）

[claude]

Claude finished @flyq's task in 1m 3s —— View job

---

Tasks

• Gather context and understand request
• Read current docs/node/witness.md to verify the Cache-Control section
• Refine wording to reflect intended permanent behavior

---

The previous job had already corrected the false Cache-Control: public, max-age=31536000, immutable claim. Since you've confirmed that no-store is the intended permanent behavior (not a temporary limitation), I made one further small fix:

- Do not rely on HTTP caching — the endpoint currently returns `Cache-Control: no-store`.
+ Do not rely on HTTP caching — the endpoint returns `Cache-Control: no-store`.

Dropping "currently" removes the implication that HTTP caching might be added later. The sentence now reads as the stable, intended design.
· Branch: liquan/witness_doc

[claude]

All six previous threads are resolved. One remaining issue flagged inline: the ## Request table uses a transposed layout that puts a meta-label (Field) alongside actual field names (Method, Params) as column headers, making the row with Value ambiguous. Suggested a conventional vertical two-column table instead.

Otherwise the PR looks good — the stateless/ → node/ rename is properly propagated across AGENTS.md, docs/AGENTS.md, SUMMARY.md, and the page itself; the new witness.md is thorough and well-structured with correct GitBook syntax, sentence-case headings, and one-sentence-per-line formatting.

[claude]

All prior review threads have been addressed and resolved.

Summary of changes:

• docs/stateless/ renamed to docs/node/ (with stateless-validator.md → stateless-validation.md) — clean rename, no stale cross-references remain anywhere in the docs tree.
• AGENTS.md and docs/AGENTS.md updated to reflect the new path.
• docs/SUMMARY.md wired correctly — Get Block Witness nests under Stateless Validation at the right depth, consistent with other sections.
• New docs/node/witness.md is thorough and accurate: one-sentence-per-line rule followed, all headings in sentence case, hint/tab blocks used correctly, base64 --decode (cross-platform) in the example, and all upstream source links are pinned to specific file/line locations.

The page intentionally documents two lookup modes (not three as the PR description originally stated); that was discussed and the thread resolved.

LGTM.

[nnsgmsone]

lgtm