feat(trace-hook): add uniswap v4 hook package#1
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new contracts/trace-hook foundry package implementing the v4 hook that fingerprints the swap caller against TraceAttestation and routes a basis- point share of the pool fee into the scanner funding sink. - src/TraceHook.sol: beforeSwap fingerprint + scanner fee routing (cap 1%), afterSwap stub reserved for price-impact signal capture - src/Errors.sol: custom errors for misconfig / unauthorised callers - src/interfaces/: minimal v4 IHooks + IPoolManager surface, ITraceAttestation read view, IScannerFunding sink - src/libs/: PoolKey + BeforeSwapDelta type mirrors with v4-core sync note - test/TraceHook.t.sol: forge tests with mock registry + mock funding sink - README.md (package): layout, deploy command, v4-core sync policy design constraints: - hook never writes to the attestation registry - scanner-funding call is try/catch wrapped: a misconfigured sink cannot block a swap - ZERO_DELTA + lpFeeOverride 0: swap numerics identical to a hookless pool - fee bps hard capped at 100 (1%) root README updated to reference the new package.
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Summary
contracts/trace-hookfoundry package implementing the v4 hook described on traceprotocol.tech ("hooks. fees. forensics.")beforeSwap, hook reads the caller's verdict fromTraceAttestation, emitsSwapFingerprintedfor off-chain indexers, routes 1% ofamountSpecifiedinto the scanner-funding sink in pool currency0README.mdrepo tree updated to reference the new packageDesign constraints
TraceAttestationtry/catchwrapped — a misconfigured sink can never block a swapZERO_DELTA+lpFeeOverride = 0— swap numerics identical to a hookless poolsetScannerFeeBpsPoolKey,BeforeSwapDelta,IHookssubset, minimalIPoolManager) live insrc/libs/+src/interfaces/with a sync-policy note. these get swapped for direct@uniswap/v4-coreimports once v4-core tags 1.0Test plan
cd contracts/trace-hook && forge installforge test -vv— mock registry + mock funding sink cover: scanner gets exactly 1% of amountSpecified, only PoolManager can invoke, mismatched PoolKey reverts, fee bps cap at 100 enforced, owner can lower feeTraceHook.solagainst the public copy on traceprotocol.tech/components/v4-hook-section.tsxsnippet — they should describe the same flow🤖 Generated with Claude Code