Reentrancy is a smart contract vulnerability where an external call lets another contract call back in before the first call finishes. Attackers use it to act on stale state, often withdrawing funds repeatedly.
A security audit is a structured review of systems, code, configuration or processes against a defined standard. It produces findings showing where security falls short and how to fix it.
A smart contract is a program deployed on a blockchain that runs exactly as written whenever it is called. It can hold and move digital assets according to its own rules, without an intermediary.
A smart contract developer writes, tests and deploys programs that run on a blockchain and execute automatically when conditions are met. Because contracts often hold value and are hard to change, buyers should weigh security track record above speed.
Formal verification uses mathematical proof to show that a program meets stated properties for every possible input. It goes beyond testing, which only covers the cases someone tried, and is increasingly used on high-value contracts.
An upgradeable proxy is a smart contract pattern that lets code be changed after deployment. A fixed proxy address holds the data, while a separate logic contract can be swapped for a new version.
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