A Constantinople postponement postmortem

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Quick Take
- Ethereum’s Constantinople network upgrade has been postponed after a vulnerability was discovered relating to EIP-1283
- More than 80% of nodes are now running a non-Constantinople client
- Core developers will convene on Friday to decide what the course of action will be
- The vulnerability raises interesting questions regarding the extent and definition of Ethereum’s immutability
What happened? Just one day before Ethereum’s Constantinople network upgrade was set to take place, ChainSecurity, a smart contract auditing service, disclosed an unintended consequence related to EIP-1283’s introduction of cheaper gas costs for SSTORE operations, which could open up existing contracts to reentrancy attacks. While actually successfully exploiting the vulnerability is considered highly implausible, […]
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