Solana community proposes removing persistent nonce proposal
The Solana community submitted the SIMD-0723 proposal on 2026-11-05, proposing to remove durable nonces. The proposal requires each transaction to include the recent blockhash in order to provide anti-replay protection, and disables the instructions in the system program used to initialize, advance, and upgrade nonce accounts.
The proposal has not yet been merged and requires approval from at least one Anza team member and one Firedancer team member. The proposal text states that the relevant functionality will not be activated on mainnet-beta before 2027-05-05 at the earliest, leaving users at least six months to migrate from the date of the proposal’s release. Solana Foundation had previously stated that durable nonces will be removed after an appropriate alternative is ready and sufficient migration time has been provided.
Original source:
Title: SIMD-0723: Remove Durable Nonces Publisher: grod220 (GitHub Pull Request) Publication date: 2026-11-05 URL: https://github.com/solana-foundation/solana-improvement-documents/pull/723 Source type: Solana Improvement Proposal (SIMD) draft Verification status: This reading reviewed the proposal PR description and discussion, verification date 2026-11-08 Supported content: Support for removing durable nonces, requiring the recent blockhash, disabling the relevant system program instructions, and the statement that activation will be no earlier than 2027-05-05
ABAB AI Insight
Durable nonces allow transactions to replace the recent blockhash with a stored nonce value, thereby bypassing the roughly 150-block expiration window and supporting offline signing and delayed submission. After SIMD-0723 proposes removing them, all transactions would need to use the recent blockhash, and nonce-related system instructions would become invalid.
A deprecation page previously released by the Solana Foundation in 2026-10 said that removal is expected to take place about six months after the replacement on-chain signature verification program is ready, and the exact date has not yet been finalized. The 2027-05-05 date in the proposal is the earliest activation time, and the actual timeline still depends on the proposal’s passage and the readiness of the alternative solution.
ABAB News · Cognitive Law
Durable nonces are used to extend transaction validity, and the proposal requires a return to relying on the recent blockhash to prevent replay.
The instructions in the system program for initializing, advancing, and upgrading nonce accounts will be disabled after activation.
The earliest activation date is set at 2027-05-05, leaving a migration window for users who rely on this mechanism.