On August 23, 2026, developers Kevondrae Wedderburn, Tom Wamsganss, and Thomas Corage published a technical proposal to modify the smart contract for accepting deposits on the Ethereum network. The primary goal of this change is to proactively prepare the staking infrastructure for potential threats from quantum computing, which could theoretically compromise modern cryptographic standards in the future.
Currently, the security of most blockchain networks, including Ethereum and Bitcoin, is based on elliptic curve cryptography. This mathematical mechanism allows users to cryptographically prove asset ownership without revealing the private key. However, quantum computers, which operate on different computational principles, are potentially capable of solving certain mathematical problems exponentially faster than classical systems, creating a risk of deriving a private key from a publicly available public key.
Expert estimates of the time horizon for this threat vary. In March 2026, Google published a study concluding that fewer than 500,000 qubits would be needed to break the current cryptography of Bitcoin and Ethereum — a figure 20 times lower than previous projections, suggesting that the theoretical threat is drawing closer. At the same time, Strategy representative Michael Saylor stated that, according to cybersecurity expert consensus, a real threat to Bitcoin will not emerge for at least another ten years. Analytics firm Grayscale also holds the view that, at the current stage, the quantum threat represents a matter of long-term trust in the system rather than an immediate technical danger.
Despite differing forecasts, major blockchain projects are implementing preventive measures. The Solana and XRP Ledger networks are already testing post-quantum protection mechanisms. Additionally, in February 2026, the Ethereum Foundation unveiled a multi-year roadmap for transitioning the network to new cryptographic standards.
The new deposit contract proposed by the developers offers greater system flexibility. It can accept cryptographic keys of various types and lengths — up to 8,192 bytes — as opposed to the current fixed format of 48 bytes. Each deposit will be assigned a unique scheme identifier indicating the type of cryptography used. The identifier "0" is reserved for the current key format used by existing validators. The remaining identifiers will be assigned to specific post-quantum algorithms following their approval by developers.
The mechanism for transmitting deposit data across the network will also change. Deposit records will be passed through a dedicated messaging channel between the transaction execution layer and the consensus layer. This architectural upgrade will not affect the user-facing experience of the deposit process.
To ensure a manageable transition, the proposal incorporates a three-stage switching mechanism. In the first stage, acceptance of new deposits will be temporarily disabled. In the second stage, the network will activate the current key format, which will continue to operate in normal mode. In the third stage, as part of a separate future network upgrade, support for the old format will be permanently and irreversibly discontinued. This approach is designed to make the transition to new cryptography a predictable and controlled process.
From a data analysis perspective, this proposal reveals a structural characteristic of the Ethereum network. Unlike Bitcoin, where the risk of compromise is limited to a narrow time window during the transaction itself, Ethereum is susceptible to so-called "at-rest" attacks. A public key, once exposed during a transaction, remains permanently visible on the blockchain. This theoretically allows a malicious actor with access to a powerful quantum computer to derive the private key from data accumulated on-chain in the future. The new deposit contract prepares the infrastructure for a change in signing algorithm, but does not directly eliminate the threat to already-published keys belonging to millions of existing accounts — an issue that may require the development of a separate key rotation mechanism in the future.