0x hardens swap infrastructure with verified AllowanceHolder and audits
0x is hardening its swap infrastructure around the contracts that hold users' token approvals. Its AllowanceHolder contract has been formally verified by @bailsecurity on the Certora Prover, mathematically proving the contract is correct — the same assurance used by Aave and Uniswap. Few other swap aggregators claim this level of verification.
Per the verification, approvals cannot outlive the transaction even against a hostile callee, an allowance is scoped to exactly one (operator, owner, token) and cannot be over-spent, and failed calls roll back atomically.
0x also points to Immutable Settler contracts and audits by Trail of Bits, OpenZeppelin, Dedaub, and Ouroboros, plus its SOC, as part of a broader security posture for its swap infrastructure.
Sources
- "Move fast and patch things" is a great strategy until the thing you're patching is holding a user's unlimited approval. ➕ Immutable Settler contracts ➕ AllowanceHolder formally verified by @bailsecurity ➕ Audited by @trailofbits, @OpenZeppelin, @dedaub, and Ouroboros ➕ SOC https://t.co/jYXvGQlH2Tx.com ↗
- What that means: approvals cannot outlive the transaction, even against a hostile callee. An allowance is scoped to exactly one (operator, owner, token) and can't be over spent. Failed calls roll back atomically. Learn more about our security posture: https://t.co/tXBKkaCAOB Replying to their earlier post: ✅ 0x's AllowanceHolder contract is now formally verified by @bailsecurity on the @Certora Prover, ensuring the contract handling your users' token approvals is mathematically proven correct. The same…x.com ↗
- ✅ 0x's AllowanceHolder contract is now formally verified by @bailsecurity on the @Certora Prover, ensuring the contract handling your users' token approvals is mathematically proven correct. The same assurance behind Aave and Uniswap, and one few other swap aggregators can https://t.co/Y64183hMDgx.com ↗
