28cbe02b-2ab0-4951-b496-06fedd3db92cIMD JOB

check-answer.mjs prints `ok`. The deliverable is written to `artifacts/answer.json` only. Summary: computed the average sale price of Opepen Edition over the pinned block window by fetching all Seaport 1.5/1.6 `OrderFulfilled` logs (12232 total), hand-decoding each per the Seaport ABI, and applying the request's exact sale/price/average definitions — 18 qualifying ETH/WETH single-NFT sales, average **85758895735690236 wei**. Verified full block coverage and cross-checked the identical result on two independent public endpoints (publicnode.com and eth.merkle.io), both confirming the pinned closing-block hash. Since the brief's `evidence` field is `"panel"`, the recipe is `{kind: "panel", source}` naming the exact on-chain method, as required by `check-answer.mjs`.

I wrote `artifacts/answer.json`. The average sale price is **85758895735690236 wei**, from 18 qualifying sales totalling 1543660123242424249 wei, rounded down. `check-answer.mjs` prints `ok` for it. - **Recipe kind:** The brief says `evidence: panel`, so the recipe has to be `panel` with a source URL. I used the publicnode RPC endpoint and described the Seaport log query in the source string. - **Method:** I confirmed chain id 1 and the closing block hash `0x84272223…bf3f`. I fetched the collection's ERC-721 `Transfer` logs over the whole window, which gave 118 transfers in 114 transactions. I then fetched Seaport 1.5 and 1.6 `OrderFulfilled` logs block by block in those blocks, kept the ones from those transactions, and decoded them by hand. - **Sales:** All 18 fills had exactly one NFT, the collection's ERC-721, and were paid only in ETH or WETH. None were excluded. - **Assumption:** A Seaport sale of a token always emits a `Transfer` of it in the same transaction, so filtering by transfer transactions loses no sales. This is noted in `notes`. - **One scan, one operator:** I used one scan from publicnode and did not cross-check the hash on a second endpoint. - **Not delivered:** The script is in `test/scratch/run.mjs`, which is not submitted.

Created `artifacts/answer.json` with average **85758895735690236 wei** across 18 qualifying sales and a reproducible RPC procedure. Reproduction matched the answer. The required validator printed `ok`.

Created [artifacts/answer.json](artifacts/answer.json) with the answer **85,758,895,735,690,236 wei**, based on 18 qualifying sales, and a reproducible RPC script. Independent decoding agreed; the required validator printed `ok`.

`artifacts/answer.json` is written and `check-answer.mjs` prints `ok`. The average sale price is **85758895735690236 wei**, about 0.0858 ETH. - **Scan:** I pulled every Seaport 1.5 and 1.6 `OrderFulfilled` log over exactly blocks 26019452 to 26026608 from `https://ethereum-rpc.publicnode.com`, which gave 12,232 logs. I confirmed chain id 1 and the pinned closing hash there, and the hash again on `https://rpc.flashbots.net/fast`. - **Result:** 18 fills qualified, 9 listings and 9 bids. None were excluded for paying in another token. Their prices sum to 1543660123242424249 wei, which divided by 18 and rounded down gives the answer. - **Decoder:** `scan.mjs` only sums raw log words and can't decode Seaport's offer and consideration arrays. I decoded them with my own script, `test/scratch/sales.mjs`, which is not submitted. - **Recipe:** the brief sets `"evidence": "panel"`, and the checker rejects any recipe kind other than `panel` for such a brief. The recipe is therefore `panel` with a source URL describing the `eth_getLogs` query, not a chain recipe the deployer can rerun mechanically. - **Earlier failure:** the last attempt died because `artifacts/` didn't exist. I created it, and the file is untracked. Under `definitions`, I count ERC-721-like item types 3, 4 and 5 as "other NFTs", which would exclude a fill. None of the 18 qualifying fills involved one. I also require exactly one offer item on both listings and bids.

`artifacts/answer.json` is written and passes the plane's check (`check-answer.mjs` → `ok`). **Answer: 85758895735690236 wei** (≈0.08576 ETH), from 18 qualifying fills summing 1543660123242424249 wei. How it was computed: - Confirmed `eth_chainId` = 1 and the pinned closing hash `0x84272223…fbf3f` at block 26026608 on `https://rpc.flashbots.net/fast`, and independently on `https://ethereum-rpc.publicnode.com`. - Whole-window scan with the skill's scanner over both Seaport addresses for the `OrderFulfilled` topic0 `0x9d9af8e3…cb6f31`: 12232 logs, 2548 blocks with logs, `pinned: true`, no chunk refused. - The scanner prints totals only and cannot decode Seaport's item arrays, so the same filter and chunking were re-fetched by a local decoder (scratch only) that reads `bytes32 orderHash, address recipient, SpentItem[] offer, ReceivedItem[] consideration`. It saw the identical 12232 events, so nothing was truncated. - 18 fills hold exactly one ERC-721 Opepen item and no other NFT: 9 listing fills (price = sum of all consideration, fees included, all items ETH/WETH) and 9 WETH bid fills (price = the offer amount). All on Seaport 1.6; none on 1.5. Nothing was dropped as a bundle, ERC-1155 or non-ETH/WETH payment — there were none. - Decode cross-checked against transaction values: the one single-fill ETH listing tx matched its price exactly, and a two-fill sweep's tx value equalled the summed prices exactly. One judgement call, stated in `definitions.matched_orders` and `notes`: two matched trades each emit two qualifying `OrderFulfilled` events (the bid side and the listing side in one transaction, at slightly different amounts — tokens 15924 and 12776). The brief defines a sale as the event and gives no dedup rule, so all 18 events were averaged; collapsing those trades would average 16 values instead.

Completed [artifacts/answer.json](/home/imd-worker2/.identitymd/work/28cbe02b-2ab0-4951-b496-06fedd3db92c/b4f25bb0-79aa-412f-b9ff-727b340a40f6/artifacts/answer.json). Computed average: `85758895735690236` wei. Validation: `check-answer.mjs` prints `ok`.

Selected model is at capacity. Please try a different model.

FAILURE: runtime_error

`artifacts/answer.json` is written and untracked (excluded by the repo's own `.git/info/exclude`), and `check-answer.mjs` prints `ok`. **Answer: 85758895735690236 wei** (sum 1543660123242424249 over 18 qualifying sales). How it was computed: - **Direct method, as the definitions name it:** `eth_getLogs` for the `OrderFulfilled` topic on Seaport 1.5 and 1.6 over exactly blocks 26019452–26026608 (12,232 events, 3,690 txs), each event's `SpentItem[]`/`ReceivedItem[]` decoded. 18 events qualified — 9 listing fills (price = sum of all consideration, fees included), 9 bid fills (price = the single ETH/WETH offer amount). No bundles, no ERC-1155, no non-ETH/WETH payments. - **Independent cross-check from the other end:** the 118 Opepen ERC-721 `Transfer` logs in the window → 114 transactions → receipts decoded for `OrderFulfilled`. Every qualifying fill must move the token, so that set is a complete superset; it produced an identical list, sum and average. - **Pin:** chainId 1 and closing hash `0x8427…bf3f` confirmed on `ethereum-rpc.publicnode.com` and on `rpc.flashbots.net/fast` (different operators). No `eth_getLogs` range was truncated or refused (~340 logs per 200-block chunk). One judgement call, stated in `definitions` and `notes`: the brief defines a sale as *an OrderFulfilled event*, and Seaport match flows emit one event per side. Two trades here (blocks 26019831 and 26023270) therefore contribute two qualifying events each, giving 18 sales from 16 token movements. The alternative reading (one sale per trade, keeping the bid side) would give 16 sales and 86467382702651515 wei — recorded in `notes` so a reader can see both, with the literal reading used because it is what the pinned definitions say. The recipe is `{ kind: "panel", source }` because the brief carries `"evidence": "panel"` — `check-answer.mjs` rejects any chain recipe there, and no catalogue chain recipe could decode Seaport item arrays anyway (`log-sum` sums one fixed data word and cannot distinguish a listing from a bid, nor filter on the NFT contract, which sits in the data rather than a topic).

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FAILURE: runtime_error

Created [artifacts/answer.json](/root/.identitymd/work/28cbe02b-2ab0-4951-b496-06fedd3db92c/b4f25bb0-79aa-412f-b9ff-727b340a40f6/artifacts/answer.json). Computed average: `85758895735690236` wei across 18 qualifying sales. Validation passed: `check-answer.mjs` printed `ok`.

Created [artifacts/answer.json](artifacts/answer.json) with **85758895735690236 wei**, averaged over 18 qualifying sales, and a reproduction program. The supplied checker prints `ok`; replaying the program against the captured RPC logs reproduces the answer.

Created [artifacts/answer.json](/home/imd/.identitymd/work/28cbe02b-2ab0-4951-b496-06fedd3db92c/b4f25bb0-79aa-412f-b9ff-727b340a40f6/artifacts/answer.json). Answer: `85758895735690236` wei, based on 18 qualifying sales. Validation passed: `ok`.

required named outputs are invalid: artifacts/answer.json: ENOENT: no such file or directory, lstat 'C:\Users\owner\.identitymd-729\work\28cbe02b-2ab0-4951-b496-06fedd3db92c\b4f25bb0-79aa-412f-b9ff-727b340a40f6\artifacts'

FAILURE: runtime_error

The deliverable is in place and untracked (the repo tracks nothing extra), which is exactly what the daemon expects. The task is complete. ## Summary **Answer: 85758895735690236 wei** (~0.0858 ETH) — the floor-rounded average sale price of Opepen Edition on Seaport over blocks 26019452–26026608, written to `artifacts/answer.json`, which passes `check-answer.mjs` with `ok`. How it was computed: - **Scan.** The stock `scan.mjs` can only sum a fixed data word, and Seaport's `OrderFulfilled` carries dynamic `offer`/`consideration` arrays, so I wrote a scratch scanner in `test/scratch/avg.mjs` that mirrors scan.mjs's chunk-halving, backoff, and (blockNumber, logIndex) dedup discipline but ABI-decodes each log in-process and prints only totals. It fetched all `OrderFulfilled` logs (topic0 `0x9d9af8e3…`, confirmed via the scan script's `--keccak`) from both Seaport 1.5 and 1.6 over exactly the pinned window via `https://rpc.flashbots.net/fast` — 12,232 logs in 6 calls, no truncation. - **Pin.** The endpoint answered `eth_chainId` = 1 and the closing block 26026608 hash matched the pinned `0x842722…fbf3f`; I confirmed the same hash on a second operator, `ethereum-rpc.publicnode.com` (my first cross-check call used a miscomputed hex block number; corrected, it matched). - **Filter, per the brief's definitions.** A sale is a fill whose items contain exactly one ERC-721 (itemType 2) of `0x6339e5…4114` and no other NFT; listing fills price as the sum of consideration amounts only when every consideration item is native ETH or WETH `0xc02a…6cc2`, bid fills as the single ETH/WETH offer amount. That left **18 qualifying sales** totalling **1543660123242424249 wei**; 12,214 logs were other collections or non-qualifying shapes, none were excluded for non-ETH/WETH payment, and there were no decode errors. - **Recipe.** The brief pins `"evidence": "panel"`, so the recipe is `{kind: "panel", source: "https://rpc.flashbots.net/fast"}` (the check script rejects any chain recipe for a panel brief). Every choice the question left open — the WETH pin, the qualifying fill shapes, one-event-one-sale dedup, floor rounding — is stated under `definitions`, and the full method with the exact command is in `notes`.

Created [artifacts/answer.json](/home/imd-worker/.identitymd/work/28cbe02b-2ab0-4951-b496-06fedd3db92c/b4f25bb0-79aa-412f-b9ff-727b340a40f6/artifacts/answer.json). Computed average: `85758895735690236` wei across 18 qualifying sales. Validation passed: `ok`.

Completed `artifacts/answer.json`. Computed result: `85758895735690236` wei. Validation passed: ```text node .imd/reads/skills/oracle-assess/scripts/check-answer.mjs artifacts/answer.json .imd/reads/oracle.json ok ```

Created [artifacts/answer.json](artifacts/answer.json) with the reproduction recipe. Average: **85,758,895,735,690,236 wei** across 18 qualifying sales. Required checker: `ok`.

**85758895735690236** wei (≈0.08576 ETH) — 18 qualifying Seaport fills, sum 1543660123242424249 wei, floor-divided by 18. Computed from `OrderFulfilled` logs over exactly blocks 26019452–26026608, scanned twice (dRPC keyed and `ethereum-rpc.publicnode.com`) with identical totals; pinned closing hash matched on both, and all 18 decoded token ids reconcile with real ERC-721 `Transfer` logs in the same transactions. `node .imd/reads/skills/oracle-assess/scripts/check-answer.mjs artifacts/answer.json .imd/reads/oracle.json` prints **ok**.

Created [artifacts/answer.json](artifacts/answer.json). Average: **85,758,895,735,690,236 wei** across 18 sales. The included reproduction script returned the same result, and the required validator printed `ok`.

The average Opepen Edition sale price over blocks 26019452 to 26026608 is **85758895735690236 wei**, about 0.0858 ETH. `artifacts/answer.json` is written, and `check-answer.mjs` prints `ok` for it. - **Scan:** I fetched every Seaport 1.5 and 1.6 `OrderFulfilled` log in the pinned range, 12,232 in total. Chain id 1 and the closing block hash matched the pin. - **Qualifying sales:** 18 fills had exactly one ERC-721 of the collection and no other NFT. The price rules were: - Listing fills count only if every consideration item is ETH or WETH. - Bid fills use the ETH or WETH offer amount. - Fills paid in any other token were dropped. - **Result:** the 18 sales total 1543660123242424249 wei, which rounds down to the figure above. - **Recipe kind:** the brief sets `"evidence": "panel"`, so the only recipe kind the answer check accepts is `panel`. Its `source` is the RPC endpoint I read from, `https://ethereum-rpc.publicnode.com`, not a page quoting the figure. - **Decoder:** I decoded the logs with my own script, `test/scratch/s.mjs`, because the provided `scan.mjs` can't decode Seaport's nested item arrays. It isn't part of the submission. - **Endpoints:** the scan used publicnode, with rpc.flashbots.net/fast and rpc.mevblocker.io/fast as rotation fallbacks. I didn't run a second full scan.

`artifacts/answer.json` is written and `check-answer.mjs` prints `ok`. The average sale price is **85758895735690236 wei**, or about 0.0858 ETH. - **Sales:** 18 qualifying sales, 9 listing fills and 9 bid fills, with a total of 1543660123242424249 wei. None of the fills touching the collection were excluded. - **Scan:** I fetched all 12,232 `OrderFulfilled` logs from both Seaport contracts over exactly blocks 26019452–26026608. The chain id was `0x1` and the closing block hash matched the pin. - **Cross-check:** A second run on a single endpoint gave the same log count and figure. The first run rotated across publicnode, flashbots and mevblocker. I named all three in `notes`. - **Recipe kind:** The brief is `evidence: panel`, and the checker only accepts `kind: panel` for that. `source` is therefore the publicnode `eth_getLogs` query rather than a rerunnable catalogue recipe. The catalogue's `log-sum` cannot filter Seaport's nested arrays by collection, so I said this in `notes`. - **Decoder not delivered:** I did not use the provided `scan.mjs`, because it can't decode those nested arrays. My decoder is in `test/scratch/sales.mjs`, which is not submitted. - **Definitions:** All the pinned definitions are restated in the file's `definitions`. I counted itemTypes 2–5 as NFTs when excluding other-NFT bundles.

Created [artifacts/answer.json](/Users/peterhucik/.identitymd/work/28cbe02b-2ab0-4951-b496-06fedd3db92c/b4f25bb0-79aa-412f-b9ff-727b340a40f6/artifacts/answer.json). Average sale price: `85758895735690236` wei across 18 qualifying fills. Validation passed: `ok`.

Created `artifacts/answer.json` with **85758895735690236 wei**, averaged over 18 qualifying sales, and an RPC reproduction procedure. The supplied validator prints `ok`; reproduction matches the fetched logs.

The average sale price over the pinned window is **85758895735690236 wei** (about 0.0858 ETH). It's written to `artifacts/answer.json` and `check-answer.mjs` prints `ok`. **How it was computed:** - I pulled every `OrderFulfilled` log from both Seaport contracts over exactly blocks 26019452 to 26026608 from `ethereum-rpc.publicnode.com`, in 500-block chunks that split in half on any error. - The chain id and the pinned closing block hash matched on that endpoint and on `rpc.mevblocker.io/fast`, a second operator. - The stock `scan.mjs` can only sum fixed data fields and can't read Seaport's variable-length item lists, so I decoded the events with a small script of my own in `test/scratch/`. That script isn't part of the submission. - There were 12,232 logs, no duplicates. 18 involve Opepen Edition and all 18 qualify: 11 bid fills (paid in ETH/WETH) and 7 listing fills (every payment in ETH/WETH). Nothing was excluded. - The prices sum to 1,543,660,123,242,424,249 wei; divided by 18 and rounded down, that gives the answer. **Recipe:** `oracle.json` marks this as a panel question, so the recipe has to be `{kind: "panel", source}`. It can't be one of the log recipes. The `source` field names the exact RPC query (contracts, event topic, blocks) so the result can be reproduced from public data. **Decision for you:** two of the transactions (`0x20660df8…` and `0x9e488516…`) each emit two events for one token changing hands: a bid-side event at 0.0809 WETH and a listing-side event at 0.080091. The request defines a sale as one event, so I counted all four. If each pair should count as a single sale at the bid price, the result would be 16 sales averaging **86467382702651515 wei**. The per-event answer is the one that follows the request as written. The notes spell out both numbers, so tell me if you'd rather submit the other one.

The average sale price is **85758895735690236 wei** (about 0.0858 ETH). It's written to `artifacts/answer.json`, and `check-answer.mjs` prints `ok` for it. **How I got it:** - I pulled every Seaport `OrderFulfilled` event from the two Seaport contracts over exactly blocks 26019452–26026608 and applied the brief's definitions. `scan.mjs` can't decode Seaport's item lists, so I wrote a small script in `test/scratch/`, which is not submitted. - There were 12,232 fill events in total. 18 involve Opepen Edition and all 18 qualify: 9 listing fills and 9 bid fills. None were dropped for a bundle or another currency. - The 18 prices add up to 1543660123242424249 wei (saved as `figure`), and dividing by 18 and rounding down gives the answer. **Checks:** - The main scan used `ethereum-rpc.publicnode.com`. It refused one block range once; the script split that range in half and read both halves. - A full second scan on `rpc.mevblocker.io`, a different operator, gave the same 12,232 events and the same sum and average. - Both endpoints returned chain id 1 and the pinned hash for block 26026608. - Two other endpoints, `eth.drpc.org` and `eth.merkle.io`, refused the log requests, so nothing came from them. **Decisions a reviewer should know about:** - **Recipe kind:** the brief marks this as a `"panel"` question, so the checker only accepts a `panel` recipe with a `source`. It names the endpoint, the two contracts, the event and the block range. Nothing reruns it automatically. - **Counting:** each qualifying event counts as one sale, as the definition says, with no merging by transaction. Several transactions contain two or more qualifying events, for example a listing fill and a bid fill matched against each other. If the panel instead counts one sale per transaction, its average will differ. I noted this under `definitions` and `notes`. `artifacts/answer.json` is the only file I wrote outside `test/scratch/`, and I did not commit it.

I wrote `artifacts/answer.json`, and `check-answer.mjs` prints `ok` for it. The average sale price of Opepen Edition on OpenSea over blocks 26019452–26026608 is **85758895735690236 wei**, which is about 0.0858 ETH. That is 18 qualifying sales summing to 1543660123242424249 wei, averaged and rounded down. Every fill that touched the collection met the definitions, so none had to be excluded. - **Method:** I pulled the collection's ERC-721 `Transfer` logs over the window (118 logs, 114 transactions). I then fetched those transactions' receipts and decoded the Seaport 1.5 and 1.6 `OrderFulfilled` events. I did not scan every Seaport log in the window. An NFT fill always emits a `Transfer`, so starting from the collection's transfers should miss nothing. - **Chain check:** `eth_chainId` is 1 and block 26026608's hash matches the pin. I only checked the hash on publicnode, not on a second operator. - **Recipe:** The brief says `evidence: "panel"`, so the checker only accepts `{kind: "panel", source}`. The catalogue has no recipe that averages, so that recipe is not something the deployer can rerun. The method is described in `notes` and `definitions` instead. - **Source URL:** `recipe.source` is the publicnode RPC URL plus a description of the calls, not a page that quotes the figure. - **Scratch files:** I used my own script in `test/scratch/` rather than `scan.mjs`, because that script sums raw log words and cannot decode Seaport's nested offer and consideration items. `test/scratch/` is not submitted.

Created `artifacts/answer.json`: **85,758,895,735,690,236 wei**, averaged over 18 qualifying sales. The included reproduction script confirmed the result from public RPC data. The required checker printed `ok`.

`check-answer.mjs` prints **ok** (exit 0). Done. ## Answer **85758895735690236 wei** (≈0.08576 ETH) — the mean of 18 qualifying Opepen sales, sum 1543660123242424249 wei, floor-divided by 18. ## How it was computed The catalogue's chain recipes can't express this figure: `OrderFulfilled` carries its offer/consideration arrays as dynamic tuples in the log data, so the collection, item type and paid amounts are neither indexed topics nor fixed data words — `log-sum` can't filter or sum them. The brief also sets `"evidence": "panel"`, which the checker enforces as `{kind: "panel", source}`, so the recipe names the chain read itself as the source. The figure is still computed from chain data over exactly the pinned blocks. `scan.mjs` can't decode dynamic tuple arrays, so I used it for `--keccak` only and wrote a decoding scan in `test/scratch/seaport-avg.mjs` with the same discipline (chunked `eth_getLogs`, halving refused ranges, pausing on 429, dedupe by block/logIndex, pin confirmation, totals-only output). Two independent passes, identical results: - **Prefiltered** — 118 collection `Transfer` logs in 109 blocks → 344 `OrderFulfilled` logs from those blocks. - **Full** — all 12,232 `OrderFulfilled` logs from both Seaport contracts across all 7,157 pinned blocks. Both find exactly 18 fills touching the collection; all 18 qualify (none dropped for a non-ETH token or bundle shape). Prices range 0.0801–0.094 ETH, so no outlier drives the mean. Endpoints: `https://rpc.flashbots.net/fast` rate-limited the scan into failure and was dropped; the whole scan ran on `https://ethereum-rpc.publicnode.com`. The pinned closing hash for block 26026608 was confirmed on both (two operators), `eth_chainId` = 0x1 on both. Open points I fixed and stated under `definitions`: one sale = one `OrderFulfilled` log (fills batched in a transaction count separately); itemType ≥ 2 counts as an NFT item for the "exactly one NFT" test; a qualifying fill needs exactly one offer item, splitting listing fills (sum all consideration, all of it ETH/WETH) from bid fills (the offer amount); WETH counted 1:1 with wei; window inclusive at both ends, `removed` logs dropped. `artifacts/answer.json` is the only file written (5,270 bytes) and is left untracked.

`artifacts/answer.json` is written and `check-answer.mjs` prints `ok`. The answer is **85758895735690236** wei, about 0.0858 ETH. I scanned `OrderFulfilled` logs on both Seaport contracts (1.5 and 1.6) over blocks 26019452 to 26026608. That was 12,232 logs, of which 18 qualified as Opepen Edition sales under the request's definitions. Their prices sum to 1543660123242424249 wei, which rounds down to 85758895735690236 when divided by 18. - **Scan script:** I did not use the delivered `scan.mjs`. It can only sum or rank a single field, so I wrote my own decoder in `test/scratch/s.mjs`, which isn't submitted. I used its `keccak256` for the event topic. - **Endpoints:** The scan ran on `https://ethereum-rpc.publicnode.com`, with the flashbots and mevblocker endpoints as fallbacks, and the closing hash matched the pin. I did not check the hash on a second operator's endpoint. - **Recipe kind:** The brief says `"evidence": "panel"`, and the catalogue only accepts the `panel` recipe for that. The recipe therefore carries only a `source` URL (the RPC endpoint) and cannot express the decoding. The full method is in `notes`. - **Key order:** The checker required the `window` keys in the brief's order (`toBlock`, `fromBlock`, `toBlockHash`), so I reordered them.

Created [artifacts/answer.json](/home/worker/.identitymd/work/28cbe02b-2ab0-4951-b496-06fedd3db92c/b4f25bb0-79aa-412f-b9ff-727b340a40f6/artifacts/answer.json). Average sale price: `85758895735690236` wei. Validator result: `ok`.

Created `artifacts/answer.json`: **85758895735690236 wei**, averaged over **18 sales**. The embedded reproduction code returned the same result. Required validator printed `ok`.

Created `artifacts/answer.json` with average **85758895735690236 wei** across 18 sales, definitions, and reproduction code. Reproduction matched the answer; the required checker printed `ok`.

`artifacts/answer.json` is written and `check-answer.mjs` prints `ok`. The average sale price is **85758895735690236 wei**, taken over 18 qualifying sales (9 listing fills, 9 bid fills) totalling 1543660123242424249 wei. - **Recipe:** the brief says `evidence: panel`, so the check only accepts `kind: panel` with a source URL, not a `log-sum` or `log-rank` recipe. The source I named is the RPC endpoint I read from. The deployer reruns that scan on its own RPC, so the on-chain scan is the reproduction path. - **Scan:** I decoded the Seaport `OrderFulfilled` logs with my own script (`test/scratch/seaport.mjs`), because `scan.mjs` can't decode the dynamic offer and consideration arrays. It covered exactly blocks 26019452–26026608 on both Seaport contracts and read 12,232 logs. - **Window pin:** chain id 1 and the pinned closing block hash matched on `https://ethereum-rpc.publicnode.com`, the only endpoint used. I did not check the hash on a second operator's endpoint. - **Definitions:** they follow the brief. The one addition is that criteria-type NFT items (itemTypes 4 and 5) count as NFTs for the "no other NFT" rule. No sale was dropped for paying in another token or for including a second NFT. The answer file is untracked, and I left `test/scratch/` as it is.

Created `artifacts/answer.json` with **85758895735690236 wei**, averaged over 18 qualifying sales. The included reproduction code returned the same result. The required checker printed `ok`.

Wrote `artifacts/answer.json` with the reproducible calculation. Average: **85,758,895,735,690,236 wei** across **18 qualifying sales**. The required checker printed `ok`.

Created [artifacts/answer.json](artifacts/answer.json) with the answer **85,758,895,735,690,236 wei**, computed across 18 qualifying sales, and reproduction instructions. Required validator printed `ok`.