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You Still Need to Audit — DeFi Protocol Fork Analysis — What You Get, What You Change, and What You Still Need to Audit
Forking a DeFi protocol (copying Uniswap V2, Aave V2, or Yearn) saves development time but not audit cost. Here is exactly what changes when you fork, what risks carry over, and what new risks you introduce. Forking Uniswap V2 means you start with battle-tested, audited code for the core AMM invariant. The x·y=k math,...
Deployment configuration changes: - Factory address - Fee parameters (if you change fee rates) - Router address - Chain ID in deployment scripts Even trivial changes require audit: If you change the fee from 0.30% to 0.25%, you must re-audit the fee calculation logic — not because the core is wrong, but because your mo...
Misconception: 'We're forking Uniswap, so we only need to audit our modifications.' Reality: Audit firms do not 'certify' forks of audited code. Every audit is specific to a specific codebase at a specific commit. A fork is a new codebase. What auditors actually do on a fork: - Verify the fork is identical to the audit...
Common integrations: The Graph, Alchemy/Infura, OpenZeppelin Defender, and popular wallet providers.
Clarify requirements, compliance needs, architecture risks, and launch goals.
Implement core contracts, integrations, product flows, tests, and deployment automation.
Run QA, prepare audit handoff, deploy infrastructure, and support production rollout.
Uniswap V3's concentrated liquidity is protected by the Business Source License (BSL) until April 2023 — it has since expired, making V3 freely forkable. However, correctly implementing V3's tick mathematics requires specialized expertise. Incorrect tick implementations have caused fund losses in Uniswap V3 forks. If you want V3 concentration: use Uniswap V3 directly or engage a team with verified V3 fork experience.
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