The Ethereum Foundation has set December 2029 as its goal for making Ethereum's main layer resistant to quantum computer attacks across its three core components: transaction execution, consensus among validators, and data availability. The deadline was presented by the group responsible for protocol development on Monday (7).
The foundation decided to work with the hypothesis that the so-called "Q-day", the moment when quantum computers could become capable of breaking part of the cryptography currently in use, could occur as early as 2030. The organization itself considers this scenario aggressive and acknowledges that more common estimates point to a later threat.
The timeline turns quantum resistance from a long-term project into a priority for the network's upcoming upgrades. The Ethereum Foundation said it will treat the deadline as non-negotiable at least until January 2027, when it intends to reassess the progress of quantum computing with outside experts.
Hegotá prepares the cryptographic migration
The change begins to be prepared in the Hegotáupgrade. The update will not make Ethereum fully resistant to quantum computers, but it is expected to introduce mechanisms needed so accounts can adopt new types of signatures in the future without requiring a new hard fork for each cryptographic scheme.
One of the main components is EIP-8141, known as Frame Transactions, which introduces a native form of account abstraction. According to the foundation, the model will allow accounts to gradually move away from the current secp256k1 keys, which are considered vulnerable to sufficiently advanced quantum computers, and adopt new signatures with greater flexibility.
The full plan calls for a sequence of upgrades after Glamsterdam. Under the current roadmap, a post-quantum public key registry would arrive at stage I*, while J* would include post-quantum components for consensus, data, and transactions. Full resistance would continue to be pursued in subsequent upgrades.
To meet the more ambitious deadline, Ethereum calculates that hard forks would need to occur, on average, every 7.2 months between Glamsterdam and the upgrade that would complete the migration. As a contingency, there is also a minimal post-quantum configuration that could keep the network operational in the face of a threat, albeit with reduced guarantees.
The change is not a response to an immediate risk. Ethereum's official documentation states that current quantum computers are still far from the capacity needed to break the cryptography that protects the network. The goal of the timeline is to carry out the migration before that risk can become concrete.
