The Offsets token project is complete, verified and committed.

What was delivered

• src/OffsetsToken.sol: a hand-written, fixed-supply ERC-20 named Offsets with symbol OFFSETS and 18 decimals. The constructor takes no arguments and mints the whole supply once to the deployer. There is no owner, mint, burn, pause, blacklist, fee or upgrade path, so nothing can grow the supply or freeze a holder after launch.
• test/OffsetsToken.t.sol: 30 tests covering metadata, the one-time mint to any deployer, every transfer and allowance success and failure path with exact error data and events, fuzzed supply conservation, the absence of mint and admin selectors, refusal of plain ETH, and an opcode scan mirroring the launch floor's check.
• script/DeployOffsets.s.sol: a deploy script whose deploy function is tested directly and reads no environment variables.
• README.md: assumptions, deployment parameters, launch values, after-launch settings (none) and operational responsibilities.
• foundry.toml pins solc 0.8.26, sets bytecode_hash = "none", and enables no ffi or filesystem access. forge-std v1.9.7 is vendored under lib/ as ordinary files with no nested git metadata.

Verification results

Check	Result
forge build	passes with solc 0.8.26
forge test	30 passed, 0 failed
forge fmt --check	passes
runtime size	1,444 bytes

The commit on main contains all files, including the vendored library. No launch.json was written, as the brief directs. Tests passing is not a security audit, so the launch's independent review should still read the contract before release.

Created launch.json matching OffsetsToken, its exact supply, empty constructor arguments, and required pool/economics.

Only launch.json changed.

Validation: manifest and compiled ABI checks passed; forge build succeeded; all 30 tests passed.

The findings file is in place at the repository root, excluded from git by the harness's own .git/info/exclude rule as intended, the scratch directory is removed, and no tracked file changed.

Result: no defects found in the assigned area. The review covered Access Control, Trust Gap and Asymmetry against src/OffsetsToken.sol, and the file .imd-findings.json holds an empty findings list with eight coverage rows.

What was checked

• Access control. The ABI exposes exactly three state-changing functions. Each writes only state keyed by the caller's own identity: approve writes the caller's allowance, transfer moves the caller's balance, and transferFrom spends the caller's allowance from the named owner before moving funds. There is no owner, modifier, initializer, mint, burn, pause, blacklist, receive or fallback, and the constructor takes no arguments and only mints to the deployer.
• Asymmetry. Both balance writers route through one internal transfer function. The allowance setter and the allowance decrement are the only allowance writers and each is guarded by the caller's identity. Self-transfer under the unchecked block, transferFrom with sender equal to recipient, a zero-address owner, and sticky unlimited allowance were all fuzzed or tested in a scratch suite and behaved correctly.
• Trust gap. With no privileged actor and no economic formula beyond exact transfers, none of the four seams in the guide has an actor to exploit them.
• Launch floor. Supply is a constant of one billion tokens at 18 decimals, minted once to msg.sender, and transfers move exactly the stated amount, so the factory, distributor and PoolManager flows arrive whole. Existing tests confirming no DELEGATECALL, CALLCODE or SELFDESTRUCT and refusal of plain ETH pass on this build.

Static analysis leads. Slither reported nothing. Aderyn's large-numeric-literal note on line 23 is a style remark about the supply constant and not a defect, so it was left out.

Trust assumptions, not findings. The ERC-20 approve race is inherent to the standard and is documented in the source and README. The Approval event emitted on each allowance decrement is permitted by the standard. Whoever deploys receives the full supply, which in the launch is the factory.

The deploy script was outside my area but is covered with a holds row since it only wraps the constructor. All 30 existing tests pass and formatting checks are clean.

Review complete. The findings file is written and validated, and the scratch tests are removed so the tree holds only .imd-findings.json.

Outcome: no economic, invariant or flow-gap defect in src/OffsetsToken.sol. One info-level note recorded.

What I checked, against the Economic Security, Invariant and Flow Gap guides:

• Conservation invariant. A handler-based Foundry invariant run over random transfer, approve and transferFrom calls across five actors never broke sum of balances equals the constant 1e27 supply. The unchecked arithmetic is safe under that law, and self-transfers re-read storage so balances are preserved.
• Supply growth. The compiled ABI exposes only approve, transfer and transferFrom as state changers, no receive or fallback, and the runtime has no delegatecall, callcode or selfdestruct. Supply cannot grow or be minted after construction.
• Launch flows. No fee, burn, exemption, pause or blacklist exists, and transfer returns true. A launch-shaped sequence of factory to distributor to claimant, factory to pool, and pool to trader and back moved exact amounts in a scratch test. The protected harness checks should pass. I could not run that harness itself because its Uniswap v4 and LaunchLiquidity dependencies are not in this tree.
• External dependencies and economics. The token calls no other contract and has no price, fee or cap logic. The only trust assumption is the launch design itself: whoever deploys receives everything, which is the factory.
• Static analysis lead. The large-numeric-literal line is the constant-folded supply, computed as exactly the manifest value and below 2^256.

Info finding recorded: transferFrom(address(0), to, 0) succeeds from any caller and emits a mint-shaped zero-value Transfer plus an Approval for owner address zero. OpenZeppelin reverts there. Nothing moves and a non-zero amount reverts, so there is no fund or supply impact. The reproduction and a one-line fix are in the file.

Coverage record: all three listed entry points have rows, two holding and transferFrom pointing at the info finding, plus five rows for the invariants and flows checked.

The review is complete. The findings file is in place at the repository root, the scratch tests are removed, and no tracked file was changed.

Outcome: the Offsets token holds up under the Execution Trace, Periphery and First Principles checks. I found no loss-of-funds, supply-growth, privileged-path or launch-flow defect. The one substantiated item is informational.

What I checked, in depth, in my area

• Execution Trace. Traced approve, transfer and transferFrom from entry to final state. Sentinel paths: zero to refused, max allowance is exact (max minus one still decrements) and does not bypass the balance check, self-transfer re-reads storage so the cached balance is not stale. Fuzzed supply conservation over random sixteen-step sequences across four actors, plus self-transfers through both paths.
• Periphery. The token imports nothing and uses no assembly. The only peripheral code is the deploy script, which wraps the constructor in a broadcast and is not part of the launch.
• First Principles. The constructor's assumptions hold: no arguments, no external call, supply written once to the deployer. The unchecked addition relies on the sum of balances equalling the fixed supply, which is enforced because only one conserving function writes balances after construction.
• Static-analysis lead. The aderyn large-literal line is the correct 1e27 supply constant, not a defect.

The one finding (info). A zero-amount transferFrom with the zero address as sender succeeds and emits Transfer(address(0), to, 0), the same shape as the constructor's mint event. Reproduction is any caller sending transferFrom(address(0), bob, 0) on a fresh deployment. Balances, allowances and total supply are untouched, so it affects only off-chain indexers that count mint-shaped events. OpenZeppelin reverts on a zero sender, so the author may want parity.

Coverage record. All three listed entry points have rows, plus rows for the constructor mint, the supply invariant, the launch-flow invariant, the opcode scan, and the two periphery surfaces. Nothing was left unreached.

The review is complete and .imd-findings.json holds the result. The scratch tests were removed, so the tree is unchanged apart from the findings file.

Outcome: no math defect found. The Offsets token is a hand-written fixed-supply ERC-20 with no division, scaling, casts or external calls, so most of the Math Precision, Boundary and Numerical Gap checklists have nothing to attach to. I traced the two unchecked blocks, the three sentinel branches and every zero or max boundary, and confirmed them with Foundry tests before deleting them:

• Supply constant is exactly 1e27 and splits into the launch's 10/80/10 shares with no dust. The aderyn large-literal lead is stylistic only.
• Unchecked subtraction in both _transfer and _spendAllowance sits behind an explicit < guard. The unchecked addition cannot overflow because an invariant fuzz over seven actors confirmed every balance stays at or below the supply and the sum stays conserved.
• Boundaries at amount zero, whole balance, supply plus one, max uint, allowance max minus one, allowance exactly max, and self-transfer all behave as intended.

One info-level finding is recorded. Anyone can call transferFrom(address(0), to, 0) with no allowance and it returns true, emitting a zero-value Approval and a Transfer from the zero address. The event has the shape of a mint, which can mislead indexers, but no balance, allowance or supply changes, and a non-zero amount reverts. OpenZeppelin rejects a zero sender, so this diverges from the convention the NatSpec cites. The suggested fix is a one-line sender check that changes no intended behaviour.

Coverage has seven rows: the three ABI entry points plus the supply invariant, the constant, the constructor and the views. approve and transfer hold. transferFrom points to the info finding. Nothing was left unreached.

Added 21 edge-case and fuzz tests plus three stateful invariants covering supply conservation, balances, allowances, and failure rollback.

Offline forge build and forge test pass: 52 tests, zero failures, including 24,576 randomized handler calls. Mutation checks caught all three seeded faults.

No confirmed implementation defects found. Only test/ files were added.

The review is complete and the findings file is written. The tree is otherwise unchanged.

Outcome. The Offsets token is a plain fixed-supply ERC-20 with no privileged path, and it holds on all three entry points. One specialist finding survived, at info severity.

What I kept. Three specialists reported the same root cause, so they are merged into one finding. Any caller can run transferFrom from the zero address with a zero amount, and the call succeeds while emitting a mint-shaped Transfer event. I reproduced it with a Foundry test under test/scratch, including the control that a non-zero amount reverts with InsufficientAllowance. Nothing moves, supply cannot grow, and the launch floor is unaffected, so it stays at info with no proof attached.

What I verified myself.

• The full project suite passes, including the invariant suite with 256 runs and no reverts.
• Runtime bytecode disassembly shows no DELEGATECALL, CALLCODE or SELFDESTRUCT. Creation and runtime sizes are far under the protocol limits.
• The manifest matches the code: argument-free constructor, 18 decimals, and the exact minted supply.
• Max allowance is not decremented, self-transfer of a full balance is safe, and the unchecked arithmetic is bounded by the fixed supply.

Coverage. All three entry points are answered, plus two invariant rows for fixed supply and factory deployability. The scratch test was removed after it ran.