The deliverable is complete, but I could not run any of the checks: this session's Bash sandbox rejects every command before it starts (apply-seccomp: write /proc/self/setgroups ... Permission denied, even for forge --version), and reads outside the repository are blocked, so I could not vendor forge-std or OpenZeppelin either. I wrote the project to be dependency-free so the verifier can build it offline, and reviewed every file by hand instead of compiling.

What was built

• src/CryptoPunkin.sol: contract CryptoPunkin, name CryptoPunkin, symbol PUNKINS, 18 decimals. The constructor takes no arguments and mints the whole supply to msg.sender once, which is the factory under the launch. totalSupply() is a compile-time constant, so there is no mint, burn, owner, pause, blocklist, fee, fallback, delegatecall or selfdestruct. Reverts use OpenZeppelin v5 custom error names.
• src/interfaces/IERC20.sol: the ERC-20 interface with metadata.
• test/utils/TestBase.sol: a small cheatcode interface at forge's cheatcode address plus pure-Solidity assertions and a non-rejecting bound, replacing forge-std.
• test/CryptoPunkin.t.sol: 32 tests covering metadata, the one-time mint to whichever address deploys, transfer and approve and transferFrom success paths with events, every revert path with exact error data, rejection of admin and mint selectors from both the deployer and a stranger, and five fuzz tests for conservation and allowance arithmetic.
• script/DeployCryptoPunkin.s.sol and test/DeployCryptoPunkin.t.sol: a reviewable deploy script whose deploy() is tested directly and reads no environment.
• foundry.toml: solc = "0.8.26", bytecode_hash = "none", optimizer at 200 runs, cancun, no ffi or fs permissions.
• README.md: behaviour, assumptions, manifest values (supply 1e27 minor units, no constructor arguments), nothing to set after launch, and operational responsibilities.

What is unverified

• forge build, forge test and forge fmt --check did not run here. In the manual review I found and fixed one definite compiler error (@notice on private constants) and removed one test that depended on expectEmit across a contract creation, which I could not confirm. The remaining risk is a cheatcode signature or overload mismatch I could not catch by reading.
• Nothing is committed: git is also unreachable without a working shell, so the working tree holds the deliverable for the harness to pick up.

Supply table, for the manifest step:

Field	Value
token.contract	CryptoPunkin
token.decimals	18
token.totalSupply	1000000000000000000000000000
token.constructorArgs	none

I found no defects in the permissions area of CryptoPunkin. .imd-findings.json holds an empty findings list and a coverage row for each of the three entry points, all marked holds. The existing project tests pass (39 of 39), and I changed no files apart from writing that findings file.

I checked src/CryptoPunkin.sol against the Access Control, Trust Gap and Asymmetry guides:

• Access control: there is no owner, admin, minter, pause, blocklist, exempt list, upgrade path, receive or fallback. The constructor takes no arguments and gives no role to anyone. After deployment, the only stored state is balances and allowances, and only the holder's own call can change them.
• Trust gap: the token makes no external calls and trusts no address. The factory gets the supply only as an ordinary balance, so it has no special power to move or freeze anyone else's tokens. The launch flows (factory to distributor, distributor to claimants, seeding and swapping through the pool manager) move exactly the amount requested.
• Asymmetry:
  • approve sets only the caller's own allowance and refuses address(0) as spender.
  • transferFrom spends only the caller's allowance from from and reverts when it is too small. An allowance of the maximum value is treated as unlimited, as in OpenZeppelin.
  • _transfer checks both zero addresses and the sender's balance before its unchecked arithmetic. A transfer to yourself leaves your balance unchanged, and a zero-value transfer succeeds as the standard requires.
• Supply: the total is a fixed constant of 1e27 minor units (1,000,000,000 tokens with 18 decimals), credited once to msg.sender in the constructor. Nothing can mint or burn afterwards.
• Static analysis: slither reported nothing. Aderyn's one low item is the "large numeric literal" at line 39, which is just the supply constant 1_000_000_000 * 10 ** 18, so it is not a defect.

There are no launch.json or application contracts in this tree, so there was nothing there to review. I could not run the protected launch tests: they need the launch environment variables and src/ files (LaunchLiquidity and others) that this repository doesn't have. I checked the token against what those tests require by reading it instead.

The review is complete and the result is clean. The findings file holds an empty list and a six-row coverage record, the scratch tests are removed, and no tracked file changed.

What I reviewed. The token in src/CryptoPunkin.sol against the Senior Auditor's Mindset and the Math Precision, Boundary and Numerical Gap guides. The contract has no division, no scale conversion, no downcast, no external call, no payable path and no sentinel branch other than the zero-address checks and the max-allowance sentinel. That leaves the two unchecked blocks and the edges of each entry point, which I traced by hand and then exercised with a scratch Foundry suite.

What held, with the inputs I used:

• Unchecked subtraction in both _transfer and transferFrom is guarded by a strict less-than revert immediately before it. A self-transfer of 6 from a balance of 5 and a max-uint value against the full supply both revert with the expected custom error.
• Unchecked addition to the receiver cannot wrap because the sum of all balances is the constant 1e27, far below 2^128. A random 32-step sequence of transfers and transferFroms conserved that sum across 2000 fuzz runs.
• Self-transfer inside the unchecked block re-reads the slot it just wrote, so balance is unchanged for every fuzzed held and value pair, through both transfer and transferFrom.
• The unlimited-allowance sentinel matches only the exact max value. An allowance of max minus one is decremented, and a max-value transferFrom under an unlimited allowance reverts on balance with the allowance untouched.
• Zero-value paths take the same code as non-zero ones. A zero transferFrom without allowance moves nothing and spends nothing, matching OpenZeppelin v5 and EIP-20.
• Supply constant is exactly 1e27 with no compile-time truncation. The aderyn large-numeric-literal line is style only.
• Launch floor, outside my area but checked for severity: the reachable runtime has no DELEGATECALL, CALLCODE or SELFDESTRUCT, is under the EIP-170 limit, and refuses ether and unknown selectors.

The project's own 39 tests also pass. Nothing in my area was left unreached, and the three listed entry points each carry a holds row with its reason.

Created launch.json matching CryptoPunkin’s constructor, exact supply, pool settings, and economics.

forge build and all 39 tests passed using scratch-local Solidity 0.8.26 and the required fuzz seed. Only the manifest changed outside scratch.

The findings file is valid and the working tree is unchanged apart from the gitignored scratch test and the findings file itself.

Result: no defects found in the economics area. The review is recorded in .imd-findings.json with an empty findings list and seven coverage rows, one for each of the three entry points plus four invariant and deployment rows.

What the code is. CryptoPunkin is a dependency-free ERC-20 with two storage mappings and no other state. The constructor credits a compile-time constant supply to the deployer and nothing can mint, burn, pause, block, tax or upgrade afterwards. The compiled ABI contains only the ERC-20 functions and a public supply constant.

What I checked, by guide:

• Economic Security. No external dependency, oracle or callback exists, so nothing can be broken or sandwiched. No privileged actor exists after deployment, so the factory, distributor and requester are ordinary holders. ERC-20 compliance matches OpenZeppelin v5 semantics, including the zero-address reverts and unlimited allowance at the maximum value.
• Invariant. The sum of balances equals the constant supply. The only unmatched credit is the constructor, and every later path debits and credits the same value. A 256-run stateful fuzz over 40 mixed transfer and transferFrom steps, including self-transfers and zero values, kept the sum constant. Self-transfer inside the unchecked block conserves balance.
• Flow Gap. A probe imitating the v4 PoolManager sync and settle delta credited exactly the seed and the sell amount, and the take path paid out exactly. Transfer returns true, so the manager's require passes. The swarm share and claims arrive whole.

Static analysis leads. Slither reported nothing. Aderyn's large-numeric-literal note is the supply constant, which is compile-time evaluated and equals the manifest supply exactly, so it is not a defect.

Checks that ran. The project's own 39 tests pass. My scratch suite of 5 tests under test/scratch/ passes and is not part of the submission. No proof files were needed since nothing reached critical or high.

Trust assumptions, not defects. The ERC-20 approve overwrite race is inherent to the standard and documented by the author. Tokens sent to the contract's own address are stranded with no rescue path, which is standard behaviour for a token with no admin.

Not reached. Nothing within the assigned area was left unverified. The protected floor tests that drive the real PoolManager could not be run here because they depend on the harness's environment variables and vendored v4 sources, so I reproduced their balance-delta logic with a probe instead.

forge test passes with the verifier's fuzz seed: 52 tests, none failing. I didn't find any defects in src/CryptoPunkin.sol, so I didn't write .imd-findings.json.

What I added (two files under test/; the earlier tests are unchanged):

• test/CryptoPunkin.invariant.t.sol: invariant tests over random call sequences. A helper contract deploys the token (so it starts with the full supply) and makes random transfers, approvals and transferFrom calls between five accounts. Some calls are meant to fail: amounts one token-unit over the limit, the zero address as receiver or spender, and missing allowances. It keeps its own record of every balance and allowance. Before each call it predicts whether the call should succeed and, if not, which error it should give. Any mismatch stops the run as a failure. After every sequence, four properties are checked:

  • The total supply never changes.
  • The five accounts together hold the whole supply, and the zero address and the token itself hold nothing.
  • Every balance and allowance matches the helper's record.
  • The token holds no ether.

  These run 256 sequences of 64 calls each (16,384 calls in total), set in the test file. I checked that the runner really does fail when the helper reverts, using a deliberately failing throwaway test. A fixed-sequence test also confirms the helper reaches every success and failure path.

• test/CryptoPunkin.edges.t.sol: 11 edge-case tests, including two fuzz tests. They cover:

  • a zero-value transferFrom with no allowance
  • an unlimited allowance that is still limited by the balance
  • moving the whole supply twice on one unlimited allowance
  • an allowance one below the maximum being spent normally
  • transferFrom to yourself, and approving yourself
  • a transfer of the maximum possible number reverting cleanly rather than overflowing
  • tokens sent to the token's own address staying there
  • fuzzed sender and receiver pairs, including sending to yourself
  • failed transferFrom calls changing nothing

Points to know:

• Tokens sent to the token contract are stuck. There's no way to recover them. That's normal for an ERC-20 with no owner and isn't a defect, so I recorded it in a test rather than as a finding.
• Runtime: the invariant tests take about 100 seconds, which is most of the run time.
• Not committed: the two files are in the working tree for the upload. The brief didn't ask for a commit, so I didn't make one.

The review is complete and .imd-findings.json is written with one finding and five coverage rows. No files in the tree were changed; the scratch test and fuzz cache were removed.

Specialist findings. All four specialists and the test writer reported nothing. There was nothing to reproduce, merge, or drop.

My own pass found one defect, in the test suite, not the token. The fuzz test in test/CryptoPunkin.edges.t.sol at line 112 asserts the receiver's balance equals the transferred amount, but it never excludes the test contract itself as the receiver. That contract deployed the token and holds the whole supply, so on seeds where the fuzzer picks it the test fails. The very first forge test run on this tree failed this way, and the README's claim that the tests hold for any seed is false. I replayed the counterexample against the token directly and the balances conserve exactly, so the token is correct. Severity low. The reproduction in the file gives the exact seed and inputs.

Entry points verified as holding:

• approve rejects the zero spender, overwrites the allowance, and emits.
• transfer checks the zero receiver and the balance, moves exactly the requested amount with no fee or exempt list, and handles self-transfer correctly in the unchecked block.
• transferFrom spends only the caller's own allowance, leaves a max allowance untouched, and the allowance write is undone when the inner transfer reverts.

Launch floor checks also pass. Supply is a compile-time constant of 1e27 minted once to msg.sender, matching the manifest's totalSupply, decimals and empty constructorArgs. A scratch test mirroring the protected floor's reachable-opcode scan found no DELEGATECALL, CALLCODE or SELFDESTRUCT, and both runtime and creation code are well under the size limits. Static analysis leads were a large-literal note on the supply constant and nothing from Slither; neither is a defect.