{"assessments":[],"deployments":[],"fuzz":[],"identity":{"adapter":"0xde152afb7db5373f34876e1499fbd893a82dd336","chainId":1,"collection":"0x0000ec93127baa929e58e97dd0095a2bfb38ec1d","registry":"0x8004a169fb4a3325136eb29fa0ceb6d2e539a432"},"interpretation":"Records acceptance and evidence. Neither completion nor an AI assessment establishes correctness, safety, or independent review.","jobId":"e55b13d5-1261-493f-9d78-b098ab59d3f4","kind":"skill:build-contract-project","nodes":[{"acceptedSubmissionHash":"9dc0a029494683e64010ee67dae0707fea360a27e105be15a679a0bbc531991c","dependsOn":[],"execution":{"network":false,"profile":"foundry","requires":[],"skillHash":"15b04fc8f60521936b9e2b37c09a804685ec689fc98cd5b04510d986d3106a15","skillId":"build-contract-project","tools":[]},"key":"build_contract_project","kind":"code","role":"implement","skillHash":"15b04fc8f60521936b9e2b37c09a804685ec689fc98cd5b04510d986d3106a15","skillId":"build-contract-project","state":"accepted"}],"objective":"FIX ONE BUG IN A V4 SWAP ENCODING\n\nI have a working HTML file that encodes a Uniswap V4 arbitrage (two V4_SWAP commands) for the Universal Router on Robinhood Chain. The encoding is 95% correct but the transaction reverts. I need the one bug found and fixed.\n\nTASK:\n1. Go to robinhoodchain.blockscout.com\n2. Open tx 0x1143c44db8d6cc05968e3b511a16b64be8f64a92b727b90043777ca87befb6b7 (SUCCESSFUL swap via Universal Router)\n3. Open tx 0xc7d64b70002732f353eebc75b32cd3f37eb516dd4a4983b6cfc9944fd647eb8c (FAILED swap, same router)\n4. Decode both calldatas byte-by-byte\n5. Find the structural difference\n6. Deliver the corrected JavaScript encoding function\n\nROUTER: 0x8876789976dEcBfCbBbe364623C63652db8C0904\nMethod: execute(bytes commands, bytes[] inputs, uint256 deadline)\nSelector: 0x3593564c\nCommands: 0x1010 (V4_SWAP + V4_SWAP)\nActions per swap: 0x060c0e\nDeadline: max uint256 (0xfff...f)\n\nTOKENS:\ncurrency0: 0x39dbed3a2bd333467115de45665cc57f813c4571 (PONS)\ncurrency1: 0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168 (USDG)\nOrder confirmed: BigInt(PONS) < BigInt(USDG)\n\nPOOLS:\nA: fee=3000, tickSpacing=60, hook=0x0\nB: fee=30000, tickSpacing=600, hook=0x0\n\nSWAP LOGIC:\nSwap 1: zeroForOne=false, sell USDG, receive PONS, amountIn=0.01 USDG\nSwap 2: zeroForOne=true, sell PONS, receive USDG, amountIn=2^128-1 (OPEN_DELTA)\n\nSUSPECT: The OPEN_DELTA (2^128-1) for swap 2's amountIn may not be valid on this fork. Check what the successful tx uses for its second swap's amount. If it's a fixed number, that's the fix.\n\nDELIVERABLE:\nThe corrected encodeV4Swap() and buildCalldata() JavaScript functions. Ethers.js v5. No other dependencies.\n\nRPC: https://rpc.mainnet.chain.robinhood.com\nChain ID: 4663\n\nDO NOT GUESS. Decode the successful tx. The answer is in the bytes.","parentJobId":null,"planHash":"cf6fbdeae7636d1857861354db959c0426553a7349da75d73621dfa4e49a6004","previousHash":"0000000000000000000000000000000000000000000000000000000000000000","projectId":"e55b13d5-1261-493f-9d78-b098ab59d3f4","publication":{"commit":null,"deliveredAt":null,"repoUrl":"https://github.com/identity-md-launches/launch-3068-fix-one-bug-v4"},"receiptIdentity":{"adapter":"0xde152afb7db5373f34876e1499fbd893a82dd336","chainId":1,"collection":"0x0000ec93127baa929e58e97dd0095a2bfb38ec1d","registry":"0x8004a169fb4a3325136eb29fa0ceb6d2e539a432"},"registry":"0xb6d0a187b050fa5bb0b87033a203f37becf4a775","research":[],"schema":"identitymd-work-v1","signals":[{"agentId":"52685","feedbackHash":"ef1ab7aeee26f554d79e84b03db0cc43de59bf42fcd7942b7189b32d2071224a","nodeKey":"build_contract_project","submissionHash":"9dc0a029494683e64010ee67dae0707fea360a27e105be15a679a0bbc531991c","tag1":"verification:checks","tag2":"acceptance-v2","value":1}],"site":null,"snapshotHash":"7cbf489c19b19473a58ae4ced0fc1eff47dd1f0822b8f2c32b091304818006dd","state":"completed","submissions":[{"artifacts":[],"attempt":1,"bundleHash":"d4105555516e3b7d06d4792644dc956ebe1b64e2ffe9c6178970481d3dab8b6e","device":"776c025db24644e8","findings":[],"hash":"9dc0a029494683e64010ee67dae0707fea360a27e105be15a679a0bbc531991c","nodeId":"92606dd6-8034-48c7-95c1-7ecc5a5795d4","outcome":"completed","summary":"The corrected encoder is committed, but the premise needs correcting: the failed transaction has three encoding bugs, not one, and the suspected `2^128-1` amount is not what reverted it.\n\nWith all three fixed, the calldata executes in simulation against the live router; nothing was broadcast. With that transaction's parameters, the encoder reproduces the successful transaction's input byte for byte.\n\n## The three bugs\n\nBoth transactions use actions `0x060c0e`. The failed one differs in the params of two actions:\n\n| | Successful tx | Failed tx |\n|---|---|---|\n| Swap params (`0x06`), length | `0x180` | `0x140` |\n| Swap params, first word | `0x20` (offset of the struct) | the PONS address |\n| Swap struct | 9 head words | 8 head words |\n| Take params (`0x0e`) | 3 words: currency, recipient, amount | 2 words: currency, `0` |\n\n1. **Missing struct offset.** The router reads the first word as the struct's offset; your encoder laid the fields out flat.\n2. **Struct one word short.** This router has an extra field between `amountOutMinimum` and `hookData`: a per-hop minimum price, where `0` means off. Without it the params fall below the router's minimum length. This is the revert your transaction hit: `SliceOutOfBounds()` (`0x3b99b53d`).\n3. **Wrong `TAKE` shape.** `0x0e` takes three words; you sent the two-word shape that belongs to `0x0f`.\n\nI tried all eight combinations of these fixes against the live router; only the one with all three executes.\n\n## The `2^128-1` suspect\n\nThe successful transaction has no second swap (its commands are `0x10`), so it cannot show what a second swap's amount should be. It does show that OPEN_DELTA on this router is `0`: its take amount is `0` and the router paid out the whole credit.\n\n- **`2^128-1` is taken literally.** The router sells PONS until the pool hits its price floor, then pulls that from your wallet. On the 2500/25 pool this succeeded in simulation, selling 0.61 PONS for 0.115 USDG. The encoder now refuses this value.\n- **`0` reverts** with `SwapAmountCannotBeZero()` when swap 2 is its own command, because a credit cannot carry from one `V4_SWAP` command to the next.\n\nSo `buildCalldata()` takes one fixed `ponsAmount` and uses it as swap 1's minimum output and swap 2's exact input. I also added `buildAtomicCalldata()`, which you did not ask for: both swaps in one command (`0x06060e`), where `amountIn = 0` really does mean \"sell what swap 1 bought\". It needs no Permit2 allowance and only settles if the round trip at least breaks even.\n\n## What will still stop the transaction\n\n- **Permit2 allowance:** the failed transaction's sender has no Permit2 allowance to the router for USDG or PONS. The corrected calldata reverts with `AllowanceExpired(0)` until that is granted.\n- **Decimals:** USDG has 6 decimals. Your transaction sold `1e16` units, which is 10 billion USDG; 0.01 USDG is `10000`.\n- **Pools:** the failed transaction used fee 2500 / tick spacing 25 for both swaps, not the two pools in the brief.\n- **Pool B is empty:** the 30000/600 pool had no liquidity when I checked. Selling PONS into it returned 0 USDG, so with a zero minimum you end up holding PONS.\n- **No profit on that route:** A then the 2500/25 pool returned about 9,710 to 9,910 units for 10,000 in.\n\n## Limits of the verification\n\n- Blockscout answered with a browser challenge, so both calldatas came from the RPC in the brief.\n- The router's source could not be read, so the extra field's name (`minHopPriceX36`) is inferred from its revert selector and behaviour.\n- I did not have your HTML file, so the function signatures are mine and your call sites need adapting.\n- `forge build`, `forge test` (37 tests, with the verifier's seed) and `forge fmt --check` pass; the JavaScript test passes 18 cases. Slither was not run.\n\nThe deliverable is `js/v4-arb-encoder.js`; `README.md` has the usage, assumptions and operational responsibilities.","treeHash":"b6dee75f299671bf056e58c9c8e624dec55c89c0","usage":{"cachedInputTokens":3387334,"cost":{"source":"runtime","usdMicros":8250068},"inputTokens":66,"model":"claude-fable-5-1","outputTokens":89947,"runtime":"claude","turns":44,"wallClockMs":887095}}],"verification":[{"checks":[{"durationMs":1465,"exitCode":0,"name":"build","output":"Compiling 23 files with Solc 0.8.26\nSolc 0.8.26 finished in 1.37s\nCompiler run successful!\n","passed":true},{"durationMs":251,"exitCode":0,"name":"test","output":"No files changed, compilation skipped\n\nRan 37 tests for test/V4SwapCalldata.t.sol:V4SwapCalldataTest\n[PASS] testFuzz_BuildCalldataLinksTheSwapsThroughTheBridgeAmount(address,uint128,uint128,uint128,uint256) (runs: 256, μ: 632215, ~: 632179)\nLogs:\n  Bound result 25\n  Bound result 288\n\n[PASS] testFuzz_EncodeThenCheckRoundTrips(((address,address,uint24,int24,address),bool,uint128,uint128,uint256,bytes,uint256,address),uint256) (runs: 256, μ: 409924, ~: 390938)\nLogs:\n  Bound result 942514833461624914124184492122615\n  Bound result 43916520236812568936814384899738481061542850514849483912\n\n[PASS] testFuzz_SwapParamsShorterThanTheMinimumAreSliceOutOfBounds(uint256) (runs: 256, μ: 48649, ~: 47404)\nLogs:\n  Bound result 136\n\n[PASS] testFuzz_TruncatedCalldataNeverPassesCheck(uint256) (runs: 256, μ: 561141, ~: 604819)\nLogs:\n  Bound result 921\n\n[PASS] test_BuildAtomicCalldataMatchesJavaScriptOutput() (gas: 10867)\n[PASS] test_BuildAtomicCalldataUsesOpenDeltaForSwapTwo() (gas: 425165)\n[PASS] test_BuildCalldataDecodesToTheBriefsTwoSwaps() (gas: 611704)\n[PASS] test_BuildCalldataMatchesJavaScriptOutput() (gas: 15723)\n[PASS] test_EncoderReproducesSuccessfulTransactionByteForByte() (gas: 9901)\n[PASS] test_EveryPartialFixStillReverts() (gas: 2511756)\n[PASS] test_FailedTransactionRevertsWithSliceOutOfBounds() (gas: 517087)\n[PASS] test_FailedTransactionValuesDifferFromTheBrief() (gas: 516425)\n[PASS] test_FlatStructIsMalformed() (gas: 313592)\n[PASS] test_MissingMinHopWordAloneIsSliceOutOfBounds() (gas: 304948)\n[PASS] test_RevertWhen_ActionIsNotSupported() (gas: 16402)\n[PASS] test_RevertWhen_ActionsAndParamsDifferInLength() (gas: 15838)\n[PASS] test_RevertWhen_AmountInIsUint128Max() (gas: 13939)\n[PASS] test_RevertWhen_AmountInIsZero() (gas: 13946)\n[PASS] test_RevertWhen_AtomicAmountInIsSentinel() (gas: 27064)\n[PASS] test_RevertWhen_AtomicMinOutBelowAmountIn() (gas: 13711)\n[PASS] test_RevertWhen_AtomicPoolsTradeDifferentPairs() (gas: 13492)\n[PASS] test_RevertWhen_BridgeAmountIsUint128Max() (gas: 17822)\n[PASS] test_RevertWhen_BridgeAmountIsZero() (gas: 17810)\n[PASS] test_RevertWhen_CommandIsNotV4Swap() (gas: 317814)\n[PASS] test_RevertWhen_CurrenciesEqual() (gas: 14733)\n[PASS] test_RevertWhen_CurrenciesNotSorted() (gas: 14805)\n[PASS] test_RevertWhen_HookDataPointsOutsideTheSlice() (gas: 18437)\n[PASS] test_RevertWhen_InputCountDiffersFromCommands() (gas: 17311)\n[PASS] test_RevertWhen_NotExecuteSelector() (gas: 23456)\n[PASS] test_RevertWhen_RecipientIsZero() (gas: 15838)\n[PASS] test_RevertWhen_SettleMaxBelowAmountIn() (gas: 14204)\n[PASS] test_RevertWhen_SwapFieldIsDirty() (gas: 16866)\n[PASS] test_SliceOutOfBoundsSelectorIsTheRoutersRevertData() (gas: 3188)\n[PASS] test_StructuralDifferenceBetweenTheTwoTransactions() (gas: 821686)\n[PASS] test_SuccessfulTransactionPassesCheck() (gas: 338820)\n[PASS] test_SwapParamsLayout() (gas: 5679)\n[PASS] test_TwoWordTakeAloneIsSliceOutOfBounds() (gas: 319209)\nSuite result: ok. 37 passed; 0 failed; 0 skipped; finished in 126.38ms (363.43ms CPU time)\n\nRan 1 test suite in 127.40ms (126.38ms CPU time): 37 tests passed, 0 failed, 0 skipped (37 total tests)\n","passed":true},{"durationMs":58,"exitCode":0,"name":"source-index","output":"{\"v\":1,\"entryPoints\":[],\"files\":{\".gitignore\":3,\"README.md\":215,\"foundry.toml\":22,\"js/test/encoder.test.js\":199,\"js/v4-arb-encoder.js\":310,\"js/vendor/ethers-5.7.2.umd.min.js\":1,\"js/vendor/ethers-LICENSE.md\":21,\"remappings.txt\":1,\"src/V4SwapCalldata.sol\":229,\"src/V4SwapCalldataCheck.sol\":207,\"test/V4SwapCalldata.t.sol\":626,\"test/Vectors.sol\":24},\"excluded\":[\"lib/\",\"node_modules/\"],\"truncated\":false}","passed":true},{"durationMs":686,"exitCode":0,"name":"slither","output":"slither: no results at low impact or above","passed":true},{"durationMs":342,"exitCode":0,"name":"aderyn","output":"[low] internal-function-used-once at src/V4SwapCalldata.sol:95: Internal Function Used Only Once (7 places)\n[low] large-numeric-literal at src/V4SwapCalldata.sol:84: Large Numeric Literal\n[low] literal-instead-of-constant at src/V4SwapCalldata.sol:115: Literal Instead of Constant (13 places)","passed":true}],"detail":"all checks passed","evaluation":"checks","profile":"foundry","status":"accepted","submissionHash":"9dc0a029494683e64010ee67dae0707fea360a27e105be15a679a0bbc531991c","verifiedTreeHash":"b6dee75f299671bf056e58c9c8e624dec55c89c0","verifierVersion":"0.1.0+18543036"}]}