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the smart contract auditing platform Code4rena has announced it will gradually cease operations. All ongoing audit contests and bug bounty programs will still be completed as normal.Web3 security platform Immunefi subsequently stated that it will collaborate with Code4rena to take over its bug bounty clients and security researchers, assisting in the migration of bounty scope, rules, and reward structures.Code4rena was known for its "competitive audit" model, allowing independent security researchers to earn rewards by discovering smart contract vulnerabilities. The platform secured $6 million in funding from Paradigm in 2023 and was acquired by blockchain security firm Zellic in 2024.
Paradigm researcher Dan Robinson proposed a new scheme called PACT (Prove Address Control with Timestamp), aimed at protecting long-dormant Bitcoin, including Satoshi Nakamoto's early addresses, from future quantum computing attacks.The mechanism allows users to prove control over an address via a timestamp without transferring assets or exposing on-chain activity. Should a future quantum attack occur, assets can be recovered based on this proof within a quantum-resistant version of the Bitcoin network.Compared to mandatory migration schemes such as BIP-361, PACT avoids the privacy exposure issues caused by proactively transferring assets, offering long-term holders a more flexible proactive protection path.