Implemented IMDRocks with on-chain art and metadata, vendored dependencies, deployment configuration, and documentation.

All checks pass: forge build, forge fmt --check, and 27 tests, including reentrancy, metadata, and randomized invariants.

Documented limitation: the EVM permits forcibly sent ETH; it remains unrecoverable without a withdrawal function. Ordinary purchases forward every wei.

Updated launch.json for IMDRocks, preserving the specified reserve/payout address and clarifying deployment notes.

Schema and constructor ABI checks passed. forge build succeeded; all 28 tests passed, including the pinned harness with local fixture inputs.

Only launch.json changed for submission. The notes retain the forced-ETH limitation.

The review is complete. The findings file is written and validated, and the scratch directory is removed so the tree is unchanged apart from .imd-findings.json.

Result: no defects found in the Access Control, Trust Gap and Asymmetry areas. The file holds one info-level trust assumption and eleven coverage rows, all holds.

What I checked in src/IMDRocks.sol:

• Permission model. There is no owner, role, initializer, proxy or delegatecall. The only state-writing sale path is buy(), and the only other writers are the unmodified OpenZeppelin v5.0.2 ERC-721 functions, whose authorization I traced in the vendored source. Invented selectors such as mint, burn, withdraw, pause and setPrice revert.
• Constructor and deployment. The beneficiary is an explicit argument, never the factory. Zero and self are rejected. Rocks 0 to 9 are minted with ten Transfer events, and the payout is immutable.
• Reentrancy from both callbacks. I ran scratch probes in which the payout contract and a buyer's onERC721Received each tried buy(), transferFrom, approve, setApprovalForAll and safeTransferFrom mid-purchase. Re-entering buy() fails on the guard. Moving one's own rocks succeeds, which is plain ERC-721 behavior and harms nobody. The sale counter and ownership were already final before either callback.
• Asymmetry pairs. The price formula is identical in buy(), priceOf and the metadata price string. The reserve mint without a callback versus the safe sale mint, and tokenURI requiring ownership versus imageOf serving all 100, are both intentional and match the brief. Transfers to the zero address are rejected, so nothing can burn and totalSupply stays equal to nextRock.
• Attack list from the brief. Out-of-order or repeated purchases, underpayment, overpayment, a rejecting payout, a 101st rock and stranded ETH all behave as specified. The existing 27 tests cover these and pass.

The one recorded item is a trust assumption, not a code defect. The payout address fixed in the constructor can stop or selectively censor every future sale if it is, or becomes, a contract that rejects ETH. Nothing in the contract can replace it. The author already documents this in the README and security notes. No chain file was supplied, so I could not verify whether that address holds code on the target chain. The deployment operator should confirm it is an EOA or an ETH-accepting wallet before launch.

The findings file is valid, the quoted snippet matches lines 67 to 68 of the source exactly, and the working tree is clean apart from the ignored scratch directory and the findings file itself.

Result: the math area is clean. I found no defect in pricing, decimal formatting, tint generation, or supply boundaries. The findings file holds one info-level note and eleven coverage rows, with all six listed entry points marked holds.

What I verified independently, beyond re-running the author's 27 passing tests:

• Price formula. All 100 values match 10000000000000 * (1 + n*n); the bound check runs before the multiplication, so no overflow path exists. Rock 10 is 0.00101 ETH, rock 99 is 0.09802 ETH, and the full sale totals 3.28155 ETH.
• Price string. The ETH decimal is built by right-aligning 1 + n*n into a five-digit template. The largest value has four digits, so the index arithmetic can never underflow. I recomputed the string for every token and compared.
• Tints. I dumped all 100 RGB triples. Number 0 is #929292; every other rock has one channel at 191 and one at 112, channels stay inside a byte, hues step monotonically around the wheel, and no two tints repeat.
• Boundaries. Zero value, one wei under and over, wrong-rock prices, buying at nextRock == 100, priceOf(100), a payout that burns most of the forwarded gas, and a precompile payout all behave as the brief specifies or revert cleanly.
• Transfer entry points. OpenZeppelin 5.0.2's unchecked balance updates are safe here: the decrement only runs after the ownership check and the total is capped at 100.

The one note is informational: the brief's sentence "no ETH ever rests in the contract" cannot hold against ETH forced in by selfdestruct, which no contract can refuse. The author already tests and documents this, and the only remedy is a withdraw or sweep the brief forbids, so I recorded it for the judge rather than as a defect to fix.

Nothing in my area was left unreached. I did not attempt the three areas assigned to other specialists beyond what overlapped with the entry-point rows.

The review is complete. The findings file holds an empty list and a full coverage record. Nothing else in the tree changed, and the scratch harness is removed.

Result: no substantiated defects in the Economic Security, Invariant or Flow Gap areas. Every item the brief asked me to try was exercised against the deployed bytecode and behaved as specified.

What I checked, concretely

• Out-of-order, duplicate and stale purchases. There is no number argument, and the exact-value check at src/IMDRocks.sol:63 uses a strictly increasing, unique price. A transaction prepared for rock n can never buy rock m, so a front-run purchase just reverts and costs the loser gas.
• Under and over payment. One wei under or over at every position reverts with no balance or counter change.
• Reentrancy from the payout's receive hook and from onERC721Received. Reentering buy returns the reentrancy-guard error in both. I also tried cross-function reentry into approve, setApprovalForAll, transferFrom and a nested safeTransferFrom from inside both hooks. Those calls succeed but cannot reach sale state. A gas-burning payout makes buy revert with PayoutFailed and rolls back the mint, the counter and the payment.
• Stranding ETH. Plain sends, unknown selectors and value on nonpayable functions all revert. Forced ETH via selfdestruct lands and stays. The code forwards only the current payment, so forced ETH never changes what a buyer pays or the payout receives. That is unavoidable on the EVM and harms only whoever forced it, so it is not reported.
• 101st rock. Sold-out state rejects every value including zero and the last price. No other path writes the mint counter and the vendored OpenZeppelin v5.0.2 ERC-721 has no public burn.
• Conservation. Total supply, the mint counter and the sum of balances stay equal through a full sale. The payout receives exactly 3.28155 ETH and the contract balance stays zero.
• Deployment input. The payout address has no code on Ethereum mainnet, Base, Arbitrum, Optimism or Base Sepolia, and has sent one transaction on mainnet. It is an EOA, so a payout that rejects ETH cannot occur with the address in launch.json.

Noted but not defects

• The payout address can buy the remaining rocks at net-zero cost, since the payment returns to it. That is inherent to a single beneficiary with no per-wallet limit, both of which the brief requires.
• Calling priceOf with the sold-out sentinel reverts. The README documents this and the brief does not define a price for number 100.
• All five aderyn low-severity lines are style or intentional choices.

Coverage. All six verifier entry points are marked holds, with seven additional rows for the invariants, constructor inputs, notes and static-analysis leads.

The review is complete. The findings file is at .imd-findings.json and nothing else in the tree changed. My scratch tests were deleted.

Verdict: the control flow holds. I found no defect in the sale, mint, payment or transfer paths. Three informational notes are recorded, none of which require a code change.

What I checked, in my area:

• Execution trace of buy(). Sold-out check, exact-value check, state update before the mint callback and before the payment, revert on payout failure. Reentry from onERC721Received and from the payout's receive both hit the reentrancy guard, and a hook that propagates that failure rolls the purchase back. A payout that return-bombs or burns gas cannot block a sale. Nested buys through a safeTransferFrom hook outside of buy() are ordinary purchases.
• Periphery. The vendored OpenZeppelin files whose hashes differ from lib/DEPENDENCIES.json were diffed against upstream v5.0.2: formatting only, no semantic change. No git submodules. Base64, Strings and the ERC721 base are unmodified in behaviour.
• First principles. Only the constructor and buy() mint, so a 101st rock is unreachable. The price formula, the five-digit ETH string, and all 100 token URIs were decoded off-chain: 100 distinct tints, hues evenly spread across the wheel, rock 0 grey, and every shaded facet inside the silhouette.
• Static-analysis leads. All five aderyn lows are style or intentional, and none produced a failing input.

The three informational findings:

1. Forced ETH via SELFDESTRUCT stays in the contract because buy() forwards msg.value, not the balance. Already documented by the author.
2. The payout address is immutable with no admin, so if the launch address is a contract without a payable receive on the target chain, every buy() reverts forever. The code behaves as specified. This needs a pre-deployment check of that address, which I could not do without a chain table.
3. The buyer-balance assertions in the existing tests are vacuous because this Foundry version's prank does not debit the pranked account. A test-coverage note only.

Coverage has 13 rows: all six listed entry points plus the constructor hold, and six invariant rows are answered, one pointing to finding 1.

Expanded boundary, callback rollback, and stateful invariant coverage.

forge build and forge test pass: 33 tests, including 16,384 invariant calls.

Reported one low-severity forced-ETH limitation with a reproduced failing proof in .imd-findings.json.

The review is complete. .imd-findings.json is written and validated (JSON parses, all three snippets match their file:line exactly, 12 coverage rows for 6 entry points). Scratch tests are removed; the tree is otherwise untouched.

Verdict: no code defects — three informational findings

What I checked against the code

• Full suite: 33 tests pass, including 128×128 invariant runs (16,384 handler calls, 0 unexpected reverts) covering ordered sale, exact payout, reentrancy from both the payout receive() and onERC721Received (blocked by nonReentrant, state already updated), one-wei over/under, sellout at 100, payout rejection rollback, all-100 metadata/SVG decoding, and tint distinctness.
• buy() at src/IMDRocks.sol:59-69: single mint path, exact-price check, nextRock advanced before _safeMint and the payout call, failure reverts everything. Rocks 0–9 minted to the constructor address with ten Transfer events; nextRock() starts at 10.
• The four ERC-721 entry points are the unmodified OpenZeppelin v5.0.2 implementation — I confirmed that by downloading the upstream tarball and diffing.

Findings kept (all info)

1. Forced ETH strands permanently (IMDRocks.sol:67) — merged from four reports (audit_math, write_foundry_tests, audit_flow #1). Reproduced with the tester's proof, which fails as stated. It's an EVM limitation the brief leaves no fix for (no withdraw; buy() forwards msg.value). Needs a requester decision — clarify the guarantee or authorize forwarding address(this).balance — not an author revision.
2. Immutable payout can halt/censor sales by rejecting ETH (IMDRocks.sol:19) — merged from audit_permissions and audit_flow #2. Reproduced; specified behaviour, recorded as a deployment-time trust assumption. Whether 0xE89e…4cB0 holds code on the launch chain was not verifiable here.
3. lib/DEPENDENCIES.json hashes don't match 10 committed vendored files (DEPENDENCIES.json:10) — my own finding. Every mismatch is forge fmt whitespace reflow; whitespace-stripped hashes are identical, so the logic is upstream. Provenance-only impact, and the fix lives under read-only lib/.

Dropped: audit_flow #3 (claim that vm.prank doesn't debit the pranked account). My scratch test on forge 1.8.3 showed ALICE debited by exactly the price and the test contract untouched, so the suite's buyer-balance assertions are meaningful.

Limits: no SVG renderer on this worker, so the "original hand-drawn boulder" requirement was checked structurally (geometry, facets, shadow, square viewBox, single tint occurrence), not visually.