19ab023f-2b92-4ef1-9ca6-458a8af98a87IMD JOB

Created [artifacts/answer.json](artifacts/answer.json) with average **877050665925925925 wei** across **27 qualifying sales**, plus a self-contained reproduction script. The embedded calculation matched the captured RPC data. The required validator printed `ok`.

Created [artifacts/answer.json](/home/imd-worker/.identitymd/work/19ab023f-2b92-4ef1-9ca6-458a8af98a87/d91a5b86-e59d-40f2-ac14-a482d40ea05a/artifacts/answer.json). Average: `877050665925925925` wei across 27 qualifying sales. Validation passed: `check-answer.mjs` printed `ok`.

Created `artifacts/answer.json` with average **877050665925925925 wei** across 27 qualifying sales and a reproducible RPC procedure. Decoder checks and reproduction replay passed. The required validator printed `ok`.

Created `artifacts/answer.json` with the reproduction recipe. Average: **877050665925925925 wei** across **27 qualifying sales**. The required validator printed `ok`.

Created `artifacts/answer.json` with the reproducible calculation. Average: **877050665925925925 wei** across **27 sales**. Required validator returned `ok`.

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FAILURE: runtime_error

required named outputs are invalid: artifacts/answer.json: ENOENT: no such file or directory, lstat 'C:\Users\owner\.identitymd\work\19ab023f-2b92-4ef1-9ca6-458a8af98a87\d91a5b86-e59d-40f2-ac14-a482d40ea05a\artifacts'

FAILURE: runtime_error

Created `artifacts/answer.json` with the reproduction procedure. Average: **877050665925925925 wei** across **27 qualifying sales**. The required checker printed `ok`.

I wrote `artifacts/answer.json`. The average sale price is **877050665925925925 wei** (about 0.877 ETH), and `check-answer.mjs` prints `ok` for the file. **How I computed it** - **What I scanned:** every Seaport OrderFulfilled event from both Seaport contracts (1.5 and 1.6) over exactly blocks 26019452–26026608, using `https://ethereum-rpc.publicnode.com`. The provided `scan.mjs` can't decode Seaport's item lists, so I wrote a small Node decoder in `test/scratch/`. It splits any refused block range in half and drops duplicate logs. - **Chain checks:** the endpoint reported chain id 1, and the closing block's hash matched the pinned one. I confirmed the same hash on a second operator, `rpc.flashbots.net/fast`. - **Result:** 12,232 OrderFulfilled logs. 27 of them qualify under the request's definitions: 10 listing fills and 17 bid fills. None were dropped for being paid in another token. The prices sum to 23680367980000000000 wei (stored as `figure`), and 23680367980000000000 ÷ 27, rounded down, is the answer. - **Recipe:** the request is marked `evidence: panel`, so the recipe is the `panel` kind. Its source names the exact log query on public RPC data. **One decision that changes the number:** 8 of the 27 counted events come in pairs. In 8 transactions, the seller's order and the buyer's matching order each emit an event for the same token, at slightly different prices because of fees. The request defines a sale as one qualifying event, so I counted both halves. If each token sold per transaction is counted once instead, there are 19 sales and the average is 890119947368421052 wei. `definitions` and `notes` in the answer state this choice and the alternative figure. **Not done:** I didn't run a second full scan, because the reference says the deployer reruns the scan before signing. The only file I wrote is `artifacts/answer.json`, and it is left uncommitted.

The average MAYC sale price over blocks 26019452–26026608 is **877050665925925925 wei**, about 0.877 ETH. `artifacts/answer.json` is written, and `check-answer.mjs` prints `ok` on it. - **Sales:** 27 qualifying sales, 10 listing fills and 17 bid fills. Their prices sum to 23680367980000000000 wei, and rounding down after dividing by 27 gives the figure above. - **Recipe kind:** the brief says `"evidence": "panel"`, and `check-answer.mjs` requires a `panel` recipe in that case. So the recipe names a source URL and nothing is rerun. The reproducible steps are in `notes`. - **Scan:** `scan.mjs` can't decode the nested item arrays in `OrderFulfilled`, so I wrote my own scan in `test/scratch/mayc.mjs`. It read logs from `https://ethereum-rpc.publicnode.com`, which returned `eth_chainId` 1 and the pinned hash for block 26026608. I did not check the hash on a second operator's endpoint, so this is a single-endpoint scan. It covered 12232 Seaport 1.5 and 1.6 logs with no duplicates or out-of-window entries. - **Completeness:** there were 92 MAYC `Transfer` logs across 83 transactions. I fetched receipts for the 64 that had no matching Seaport sale and none contained a Seaport `OrderFulfilled`, so no fill was lost to a truncated response. - **Open definitions:** each `OrderFulfilled` log counts as one sale, so a transaction with several fills counts each one. A bid whose offer isn't a single ETH/WETH item would be excluded; none occurred. This is stated under `definitions`. `artifacts/answer.json` is untracked, and I left `test/scratch/` in place.

Completed [artifacts/answer.json](artifacts/answer.json). - Answer: `877050665925925925` wei - Computation: 27 qualifying fills; `23680367980000000000` wei total - Local validator: `ok`

Created `artifacts/answer.json` with the reproduction procedure. Average: **877050665925925925 wei** across **27 sales**. Independent decoding matched, reproduction replay passed, and the required checker printed `ok`.

Created [artifacts/answer.json](/root/.identitymd/work/19ab023f-2b92-4ef1-9ca6-458a8af98a87/d91a5b86-e59d-40f2-ac14-a482d40ea05a/artifacts/answer.json). Answer: `877050665925925925` wei. Validation passed: `check-answer.mjs` printed `ok`.

Created [artifacts/answer.json](/home/imd-worker/.identitymd/work/19ab023f-2b92-4ef1-9ca6-458a8af98a87/d91a5b86-e59d-40f2-ac14-a482d40ea05a/artifacts/answer.json). Average sale price: `877050665925925925` wei across 27 qualifying sales. Validation passed: `check-answer.mjs` printed `ok`.

`artifacts/answer.json` is written and `check-answer.mjs` prints `ok`. The answer is **877050665925925925** wei. - **Result:** 27 qualifying sales (10 listing fills, 17 bid fills) summing to 23680367980000000000 wei. The average, rounded down, is 877050665925925925. - **How I scanned:** I scanned blocks 26019452 to 26026608 in one pass on `ethereum-rpc.publicnode.com` and decoded 12,232 OrderFulfilled logs from Seaport 1.5 and 1.6 myself. I didn't use `scan.mjs` because it only sums flat data words and can't decode the nested offer and consideration arrays. - **Pin check:** chain id is 1, and the hash of block 26026608 matches the pin on both publicnode and `rpc.flashbots.net/fast`. - **Recipe:** it is `panel`, because the brief sets `"evidence": "panel"` and `check-answer.mjs` rejects any other kind for such a brief. The source is the RPC URL and the OrderFulfilled query, and the definitions I applied are stated under `definitions`. The deployer therefore can't rerun it as a chain recipe. - **Untested risk:** I didn't confirm that the endpoint returned complete logs for every chunk. Chunk counts looked consistent, and I ran the scan only once. The scan script is in `test/scratch/run.mjs` and is not part of the submission. The answer file is untracked.

Created [artifacts/answer.json](/Users/peterhucik/.identitymd/work/19ab023f-2b92-4ef1-9ca6-458a8af98a87/d91a5b86-e59d-40f2-ac14-a482d40ea05a/artifacts/answer.json). Average sale price: `877050665925925925` wei across 27 qualifying sales. The supplied checker prints `ok`.

**877050665925925925** wei — 27 qualifying Seaport OrderFulfilled fills (17 bid, 10 listing), sum 23680367980000000000 wei, over blocks 26019452–26026608 with the pinned closing hash confirmed on five public endpoints. `node .imd/reads/skills/oracle-assess/scripts/check-answer.mjs` prints `ok` (exit 0) for `artifacts/answer.json`.

Created `artifacts/answer.json` with the reproduction recipe. Average: **877050665925925925 wei** across **27 qualifying sales**. The required checker printed `ok`.

Completed `artifacts/answer.json`. Computed result: `877050665925925925` wei. Verification run: `node .imd/reads/skills/oracle-assess/scripts/check-answer.mjs artifacts/answer.json .imd/reads/oracle.json` prints `ok`. I also cross-checked the scan on Flashbots and publicnode RPC; both returned 12,232 Seaport `OrderFulfilled` logs, 27 qualifying MAYC sales, and total price `23680367980000000000` wei.

I wrote `artifacts/answer.json` with an average sale price of **877050665925925925 wei**, and `check-answer.mjs` prints `ok` for it. - **Result:** 27 sales qualified out of 12,232 Seaport `OrderFulfilled` events. Their prices total 23680367980000000000 wei, and dividing by 27 and rounding down gives the answer. - **Scan:** I fetched the logs from blocks 26019452 to 26026608 on `ethereum-rpc.publicnode.com` and decoded them by hand. The chain id was 1 and the closing block hash matched the pin. - **Definitions:** I applied the request's own definitions exactly. The definitions in the file also state that other tokens, bundles and ERC-1155 fills were excluded. - **Recipe kind:** The brief says `"evidence": "panel"`, and the checker rejects any other recipe kind for a panel brief. So the recipe is `panel`, with the RPC endpoint and the event and block range as its `source`, even though the number comes from on-chain logs. - **Not re-run by the deployer:** A `panel` recipe is not something the deployer can re-run. Agreement across the panel is the only evidence for this figure. - **Scan script:** I did not use the provided `scan.mjs`, because it only sums or ranks a data field and can't apply the sale and price rules. My own decoder is in `test/scratch/s.mjs`, which is not submitted. - **Second endpoint:** I confirmed the pin on publicnode only. The flashbots and mevblocker endpoints were only fallbacks, and I did not check the closing hash on a second operator.

Done. The deliverable `artifacts/answer.json` is written, passes `check-answer.mjs` (`ok`), and is left untracked for the daemon to pick up. **Answer: 877050665925925925 wei** (~0.877 ETH average MAYC sale price over the pinned window). How it was computed: - Confirmed chain id 1 and the pinned closing hash of block 26026608 on `ethereum-rpc.publicnode.com`, and cross-checked the hash on a second operator (`rpc.mevblocker.io/fast`) — both match `0x8427…fbf3f`. - The stock scan script can't decode Seaport's dynamic arrays, so I wrote a decoder in `test/scratch/mayc-avg.mjs` that sweeps `eth_getLogs` for the `OrderFulfilled` topic on Seaport 1.5 and 1.6 over exactly blocks 26019452–26026608 (12,232 logs, deduplicated, zero decode errors) and applies the brief's definitions verbatim: exactly one ERC-721 item of MAYC and no other NFT in the fill, listing fills priced as the sum of all-ETH/WETH consideration (fees included), bid fills priced as the ETH/WETH offer amount. - That yielded 27 qualifying sales (10 listings, 17 bids) totaling 23,680,367,980,000,000,000 wei; floor(sum/27) = 877,050,665,925,925,925, verified independently. Because the brief pins `"evidence": "panel"`, the recipe is `{kind: "panel", source: "https://ethereum-rpc.publicnode.com"}` as the checker requires; the answer file's `definitions` restate the pinned sale/price/average rules plus the one thing the brief left open (a qualifying fill has exactly one offer item, and each `OrderFulfilled` event counts once), and `notes` carry the full reproduction procedure including the topic0 hash and decode layout. `figure` is the summed price. No configuration files were touched; only `artifacts/answer.json` and scratch files were written.

`artifacts/answer.json` is written and `check-answer.mjs` prints `ok`. The average MAYC sale price over blocks 26019452 to 26026608 is **877050665925925925 wei** (about 0.877 ETH). - **Scan:** I read 12,232 Seaport `OrderFulfilled` logs from both Seaport 1.5 and 1.6, and 27 of them qualified as MAYC sales. The prices sum to 23680367980000000000 wei, and dividing by 27 and rounding down gives the figure above. - **Endpoint and pin:** I used only `https://ethereum-rpc.publicnode.com`, in 500-block ranges. It reported chain id 1, and the hash of block 26026608 matches the pin. I did not check a second endpoint. - **Definitions:** They follow the brief and are stated in the file. A sale must contain exactly one NFT item, an ERC-721 of the collection. A listing's price is every consideration amount, and all items must be ETH or WETH. A bid's price is the offer amount. - **Recipe:** The brief marks this as a panel-evidence question, so `check-answer.mjs` requires `{ kind: "panel", source }`. None of the chain recipes can express this filter and average. The source field names the endpoint, both contracts, the event topic and the block range. It is not a rerunnable recipe, so a reader cannot rerun the computation from it. - **Custom script:** `scan.mjs` cannot decode the nested offer and consideration arrays, so I wrote a decoder in `test/scratch/sales.mjs`. That folder is not submitted, so the exact command is not in the answer's notes either. - **Git:** The answer file is untracked.

Created `artifacts/answer.json`. Average: **877050665925925925 wei** across 27 qualifying sales. Public-RPC reproduction matched; the supplied checker printed `ok`.

`artifacts/answer.json` is written, and `check-answer.mjs` prints `ok` for it. The answer is **877050665925925925** wei, the rounded-down average over 27 qualifying sales that total 23680367980000000000 wei. - **Method:** I confirmed the chain id is 1 and that block 26026608 has the pinned hash. Then I pulled the MAYC `Transfer` logs for blocks 26019452–26026608: 92 logs across 81 blocks. Every Seaport sale of the collection has to emit one. I then fetched the `OrderFulfilled` logs from both Seaport contracts in only those blocks (161 fills) and decoded them by hand, applying the brief's definitions. None of the 27 qualifying sales was excluded for being paid in something other than ETH or WETH. - **Recipe kind:** the brief says `"evidence": "panel"`, so `panel` is the only recipe kind the checker allows. Its `source` is `https://ethereum-rpc.publicnode.com`, which is the public RPC rather than a page, so it doesn't name a primary source. - **Endpoints:** I rotated across the flashbots, mevblocker, publicnode and valve.city public endpoints. The notes name all four. I only compared the closing block hash against the pin (it matched); I did not check a second endpoint separately. - **Scan tooling:** I used `scan.mjs` only to get the two topic hashes. The `OrderFulfilled` decoding needs the Seaport ABI, which the script can't do, so my scan script is in `test/scratch/run.mjs`, which is not submitted. `git status` shows nothing to commit, so the answer file stays untracked as the task asked.

The answer is **877050665925925925 wei** (about 0.877 ETH). It's in `artifacts/answer.json`, and `check-answer.mjs` prints `ok` for it. - **Scan:** I pulled every `OrderFulfilled` log from both Seaport contracts (1.5 and 1.6) over exactly blocks 26019452–26026608, 12,232 logs in all. I did it with my own script in `test/scratch/`, because the bundled `scan.mjs` can't decode Seaport's item lists. I ran one full scan, from `https://ethereum-rpc.publicnode.com`. - **Block check:** that endpoint reported chain 1, and the closing block's hash matched the pinned one. The hash also matched on a second provider (nodereal). - **Sales:** 27 MutantApeYachtClub sales qualified: 10 fills of a listing and 17 fills of a bid. No fill involving the collection was left out, so there were no bundles and no non-ETH/WETH payments in the window. As the definitions say, a listing's price is the sum of its payments including fees, and a bid's price is the amount offered. - **Average:** the prices sum to 23,680,367,980,000,000,000 wei, and that total divided by 27, rounded down, gives the answer. This request is marked as a panel question, so the recipe is the `panel` kind with a written source, not a rerunnable chain recipe. None of the chain recipe kinds could decode Seaport events anyway. The source, the decoding steps and each definition I applied are written into the file. Git doesn't show the file as untracked, which probably means `artifacts/` is ignored in this repo. It isn't committed, as the delivery instructions ask.

`artifacts/answer.json` is written and `check-answer.mjs` prints `ok`. The average sale price is **877050665925925925 wei**, about 0.877 ETH. - **Sales counted:** 27 in blocks 26019452–26026608 (10 listing fills, 17 bid fills). Their prices sum to 23680367980000000000 wei, and dividing by 27 and rounding down gives the answer. - **How I got it:** `scan.mjs` can't decode the nested Seaport arrays, so I wrote my own scanner in `test/scratch/`. It pulled 12,232 `OrderFulfilled` logs from both Seaport contracts and applied the request's definitions. It excluded no fills for other payment tokens. - **Checks:** - The closing block hash matched the pin. - A second scan with a different endpoint order gave the same 12,232 logs and the same result. - MAYC `Transfer` logs in the window cover all 19 sale transactions. No other Seaport transaction with MAYC transfers was left uncounted. - **Recipe kind:** the brief says `"evidence": "panel"`, and the checker only accepts `{ kind: "panel", source }` for that. I set the source to the public RPC URL plus the log query, and put the full method in `notes`. - **Endpoints:** `https://ethereum-rpc.publicnode.com` was the main one and returned HTTP 403 on some `eth_getLogs` calls. The scan fell back to `rpc.flashbots.net/fast` and `rpc.mevblocker.io/fast`. All three are named in `notes`. The file is untracked and not force-added.

Done. `artifacts/answer.json` is written, untracked, and `check-answer.mjs` prints `ok`. **Answer: `877050665925925925` wei** (≈0.877 ETH average MAYC sale price on Seaport over blocks 26019452–26026608). How it was computed: - Fetched every `OrderFulfilled` log from Seaport 1.5 and 1.6 over exactly the pinned window (chain id 1 and closing hash `0x8427…fbf3f` confirmed on the endpoint before scanning), decoded the `SpentItem[]`/`ReceivedItem[]` arrays per the Seaport ABI, and applied the brief's definitions literally: exactly one NFT item and it is a MAYC ERC-721; listing fills priced as the sum of all-ETH/WETH consideration (fees included), bid fills as the ETH/WETH offer amount. - Totals: 12,232 logs → 27 qualifying sales (10 listings, 17 bids, all on Seaport 1.6, none excluded as bundles or non-ETH payment). Sum 23,680,367,980,000,000,000 wei ÷ 27 = 877050665925925925.9…, floored. - Rescanned on a second operator (mevblocker) with smaller chunks: identical log count, sale count, sum and hash, so no silent truncation. One thing worth noting: the brief is `evidence: panel`, so the recipe is `{kind: "panel", source: <RPC read>}` — the catalogue's `log-sum` can't decode this event's dynamic arrays, which I stated in `notes`. The decoder itself lives in `test/scratch/mayc.mjs` and is not part of the deliverable.

Created `artifacts/answer.json` with the reproduction procedure. Average: **877050665925925925 wei**, across **27 qualifying sales**. The required checker printed `ok`.

Wrote [artifacts/answer.json](artifacts/answer.json). Average: **877050665925925925 wei** across 27 qualifying sales. Includes reproduction details. The required checker printed `ok`.

Created `artifacts/answer.json`: **877050665925925925 wei**, averaged across 27 sales. The included reproduction procedure returned the same result, and `check-answer.mjs` printed `ok`.

`ok`. ## Answer **877050665925925925 wei** (≈0.87705 ETH) — average MAYC sale price on Seaport over blocks 26019452–26026608. - **27 qualifying fills** (10 listing fills, 17 bid fills), summing to **23680367980000000000 wei** (the `figure`). - Nothing was rejected: no bundles, no ERC-1155 fills, no non-ETH/WETH payment among the 27 logs that touched MAYC. ## How it was computed 1. `scan.mjs` on `https://rpc.flashbots.net/fast` confirmed chain id 1 and the pinned closing hash, and found 92 MAYC `Transfer` logs across 81 blocks. 2. Those blocks were re-queried for the Seaport `OrderFulfilled` topic on 1.5 and 1.6 (451 logs), decoded in-process and reduced per the brief's price rules. Flashbots started returning 429 on the heavier pass, so the scan ran on `https://ethereum-rpc.publicnode.com`, which reported the same chain id and closing hash. 3. **Prefilter validated, not assumed**: over control sub-range 26019452–26021452, a full unfiltered scan of all 4,789 Seaport `OrderFulfilled` logs found exactly the same 6 sales and same sum as the prefiltered pass. ## Two judgment calls, both stated in `definitions` - **Recipe kind is `panel`.** The brief sets `"evidence": "panel"`, and the check-answer rule enforces it. It also happens to be the only honest option: no chain recipe in the catalogue can express a sum over a variable-length `ReceivedItem[]` whose price side depends on listing-vs-bid. The `source` is the RPC endpoint plus the exact filter, so the figure is still reproducible from public RPC data alone. - **One qualifying log = one sale, no de-duplication.** 8 of the 27 fills sit in `matchOrders` transactions that emitted two qualifying logs for the same token (the listing leg is consistently 99% of the bid leg — the 1% fee). The brief defines a sale *per OrderFulfilled event* and gives no de-dup rule or leg-preference, so both legs count. This is the judgment most likely to split the panel, and it's called out explicitly in `notes`. `artifacts/answer.json` is 5,916 bytes and untracked.

Created [artifacts/answer.json](artifacts/answer.json). Average: **877050665925925925 wei** across 27 qualifying sales. The included reproduction code returned the same result, and the required checker printed `ok`.

Created [artifacts/answer.json](artifacts/answer.json) with the average **877050665925925925 wei** across 27 qualifying sales, definitions, and reproduction code. Required validator printed `ok`.

I wrote `artifacts/answer.json` with an average sale price of **877050665925925925 wei**, and `check-answer.mjs` prints `ok` for it. - **Sales counted:** 27 qualifying sales totalling 23680367980000000000 wei, which is about 0.877 ETH each. They came from 12232 Seaport `OrderFulfilled` logs across blocks 26019452 to 26026608, decoded by hand and filtered by the request's definitions. - **Recipe:** the brief says `"evidence": "panel"`, so the recipe kind is `panel`, not a chain recipe. Its `source` is the RPC endpoint I read from, `https://ethereum-rpc.publicnode.com`, because a panel recipe needs a URL. - **Not reproducible by the deployer:** the panel recipe is not rerun, so agreement between members is what counts. My ad-hoc decoder is in `test/scratch/s.mjs`, which is deleted before submission, so it is not part of the deliverable. - **Pinned hash:** the closing block hash returned by the RPC matches the pinned one. - **Endpoints:** I read from publicnode with flashbots and mevblocker as fallbacks. I did not run a separate check of the closing hash on a second operator's endpoint. - **Window key order:** the checker rejected the first version because the `window` keys were not in the brief's order (`toBlock`, `fromBlock`, `toBlockHash`). I reordered them to match.

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FAILURE: runtime_error

Created `artifacts/answer.json` with the average **877050665925925925 wei**, based on 27 qualifying sales, plus definitions and RPC reproduction code. The required checker printed `ok`.

Created [artifacts/answer.json](/home/imd/.identitymd/work/19ab023f-2b92-4ef1-9ca6-458a8af98a87/d91a5b86-e59d-40f2-ac14-a482d40ea05a/artifacts/answer.json). Computed average: `877050665925925925` wei from 27 qualifying sales totaling `23680367980000000000` wei. Validation passed: `ok`.

Created `artifacts/answer.json` with **877050665925925925 wei**, averaged over 27 qualifying sales, plus reproduction code. The required checker printed `ok`.

Created [artifacts/answer.json](/home/worker/.imd/seat2/work/19ab023f-2b92-4ef1-9ca6-458a8af98a87/d91a5b86-e59d-40f2-ac14-a482d40ea05a/artifacts/answer.json). Average sale price: `877050665925925925` wei. Official checker result: `ok`.

Done. `artifacts/answer.json` is written (untracked, 5783 bytes) and `check-answer.mjs` prints `ok`. **Answer: 877050665925925925 wei** (≈0.877 ETH), figure = sum 23680367980000000000 wei over 27 sales. How it was computed, over exactly blocks 26019452–26026608: - Confirmed `eth_chainId` 0x1 and the pinned closing hash on two independent operators — `ethereum-rpc.publicnode.com` and `ethereum.public.blockpi.network` — and via the delivered `scan.mjs` with `--pin` (pinned true, 92 MAYC `Transfer` logs in 81 blocks). - Every ERC-721 fill moves the token, so those 81 blocks (merged into 41 in-window ranges) bound where a MAYC Seaport sale can sit. `eth_getLogs` for `OrderFulfilled` on Seaport 1.5 + 1.6 over those ranges returned 762 events, decoded with the Seaport ABI and filtered by the brief's definitions. Refused ranges halve and retry; both endpoints returned identical totals (762 events, 27 sales, same sum), which is the check against a silently truncated range. - 27 qualifying sales — 10 listing fills (price = all consideration, fees included), 17 bid fills (price = the offer). Nothing was dropped as a bundle, ERC-1155, multi-item offer or non-ETH/WETH fill; those counters were zero. The one open point, stated under `definitions` and in `notes`: for 8 tokens OpenSea settled a collection offer with `matchAdvancedOrders`, so Seaport emitted two events that each satisfy the brief's per-event sale definition (bid side and seller's mirror side). The brief gives no rule for collapsing a pair or picking a side, so both halves are counted — that is what a literal read of the definitions over the raw logs yields. The 27 events span 19 transactions and 18 token ids; a member who deduped pairs would land on a different figure, so I flagged it explicitly. Recipe is `{ kind: "panel", source }` as the brief's `"evidence": "panel"` requires — `log-sum`/`log-rank` cannot express "exactly one ERC-721 item of this collection with all consideration in ETH or WETH", since that test needs the unindexed offer/consideration arrays.

Created and validated [artifacts/answer.json](/home/imd2/.identitymd/work/19ab023f-2b92-4ef1-9ca6-458a8af98a87/d91a5b86-e59d-40f2-ac14-a482d40ea05a/artifacts/answer.json). The checker reports `ok`.