Ethereum researchers have proposed a new initiative aimed at restructuring the deposit contract used for validators to join the network, preparing for future defenses against quantum computing attacks. This proposal aims to upgrade the Ethereum validator registration mechanism by adding a cryptographic algorithm switching feature, enabling the network to support quantum-resistant signature schemes in the future.

Currently, Ethereum validators use BLS signatures to verify transactions, and the elliptic curve cryptography that this scheme relies on could theoretically be attacked by quantum computers running Shor’s algorithm. The deposit contract is the entry point for users to stake ETH and become validators. Currently, approximately 42.4 million ETH are staked, valued at around $10.4 billion, all protected by existing BLS verification keys. Researchers indicate that due to the current contract hardcoding the size of BLS keys, Ethereum will not be able to directly support new quantum-resistant signature standards even if the community determines them in the future.

At present, this proposal is still in the early draft stage and has not been formally numbered; some repository maintainers suggest numbering it as EIP-8394. If approved, the new version of the deposit contract will allow different cryptographic schemes to coexist and distinguish different signature systems through a tagging mechanism: BLS signatures will be marked as 0, while future other quantum-resistant schemes can use new tags.