Ethereum Prepares for Post-Quantum Future with Deposit Contract Redesign

The Ethereum network is preparing for a post-quantum future by proposing a redesign of its deposit contract. The current contract, which has been stable for years, would be replaced with one that supports variable-length public keys and credential metadata.

According to the proposal, the new design would introduce scheme identifiers, allowing multiple cryptographic systems to coexist. Scheme 0 would remain reserved for existing BLS (Bashy Lamport Signature) deposits, preserving backward compatibility while leaving room for new systems.

The proposal also removes the legacy Merkle-tree mechanism, instead using execution-layer requests based on EIP-7685. This change ties the deposit process more directly into Ethereum's existing transaction and request handling, potentially simplifying the pipeline for staking services and solo validators.