--- title: "Solana Proposes Deprecating Durable Nonces as Institutional Custodians Warn of DeFi Disruptions" description: "A technical pull request aims to drop Solana's durable nonces, while institutional custodian Fireblocks advocates for transaction envelopes to avoid systemic risks." url: https://basisdesk.news/news/solana-durable-nonces-simd-0723-fireblocks published: 2026-11-09T19:41:41.677Z modified: 2026-11-09T19:41:41.677Z section: Tech & Protocols author: Basis Desk Newsroom (AI-generated, source-verified) sentiment: neutral tickers: [SOL, BTC] tags: [Solana, Fireblocks, SIMD, Custody, DeFi] license: Quote with attribution to Basis Desk (basisdesk.news). Not financial advice. --- # Solana Proposes Deprecating Durable Nonces as Institutional Custodians Warn of DeFi Disruptions A technical pull request aims to drop Solana's durable nonces, while institutional custodian Fireblocks advocates for transaction envelopes to avoid systemic risks. ## At a glance - **What happened:** Developer grod220 submitted SIMD-0723 to remove durable nonces from Solana, initiating core technical review. - **Why it matters:** Deprecating durable nonces without suitable transaction structures threatens institutional custody workflows and existing DeFi integration safeguards. - **Who is affected:** Institutional custodians, staking providers, Solana core client engineers, and DeFi protocols utilizing CPI guards. - **What's next:** Review and formal approvals required from Anza and Firedancer team members on pull request #723. - **Status:** proposed - **Primary source:** [SIMD-0723: Remove Durable Nonces by grod220 · Pull Request #723 · solana-foundation/solana-improvement-documents](https://github.com/solana-foundation/solana-improvement-documents/pull/723) — github.com ## Key points - SIMD-0723 was submitted to deprecate durable nonces, requiring review approvals from both Anza and Firedancer engineers [1]. - Fireblocks supports removing durable nonces but warned CPI passthrough solutions introduce systemic operational and security risks [2]. - CPI passthrough would break existing safeguards in protocols like MarginFi, Kamino, Drift, and Token2022 [2]. ## Editorial remark - **Context:** Durable nonces resolve Solana's standard 60-second blockhash expiration for institutional custodians requiring multi-step, air-gapped signing workflows [2]. However, the mechanism introduces runtime complexity and congestion issues [2]. - **Impact:** Institutions managing millions of accounts face severe operational barriers under smart contract passthroughs, including fragmented identities, lockup constraints on staked SOL, and automated blocks from DeFi safety guards [2]. - **Watch:** SIMD-0723 requires approval from designated Anza engineers (t-nelson, steviez, or bw-solana) and Firedancer contributors before community convergence on an alternative implementation [1]. Solana developers are weighing the deprecation of durable nonces following the formal submission of SIMD-0723 by developer grod220 in the Solana Improvement Documents repository [1]. The technical proposal seeks to eliminate durable nonces from the network, a mechanism that requires joint sign-off from core engineering teams before proceeding [1]. According to repository submission guidelines, the pull request requires approval from at least one Anza team member and at least one member of the Firedancer client team before it can be merged [1]. At the time of writing, $SOL traded down 3.6% over the past 24 hours at $86.21 amid a broader market drawdown that saw $BTC fall to $74,568. Institutional custodian Fireblocks stated in an architectural review that it supports replacing durable nonces due to operational fragility, network congestion amplification, and SVM runtime edge cases encountered at scale [2]. However, the custodian warned against replacing nonces with a Cross-Program Invocation (CPI) passthrough architecture, cautioning that forcing accounts to migrate authority to Program Derived Addresses (PDAs) poses systemic risks to institutional capital across millions of Solana addresses [2]. Fireblocks noted that native SOL accounts lack an authority field assignable to PDAs, requiring complete physical transfers of SOL holdings to new addresses [2]. Furthermore, active lockups on stake accounts prevent changing withdraw authority until lockup expiration [2]. ## DeFi Compatibility and Transaction Envelopes The custodian also highlighted direct operational clashes between CPI passthrough designs and existing DeFi protections, citing deployed code paths such as stack height guards in MarginFi and Kamino flashloans, CpiGuard in Token2022, and explicit CPI bans in Drift [2]. Fireblocks stated that introducing smart contracts into the critical signing path alters cold storage security guarantees and increases institutional audit burdens [2]. Instead of CPI routing, Fireblocks endorsed the Transaction Envelope design as its preferred alternative, with the Sudo Instruction proposal as a viable second option [2]. The envelope model permits air-gapped cold keys to produce long-lived signed intents that can be wrapped in fresh execution envelopes without altering wallet identities or requiring immediate account migrations [2]. ## Sources 1. [SIMD-0723: Remove Durable Nonces by grod220 · Pull Request #723 · solana-foundation/solana-improvement-documents](https://github.com/solana-foundation/solana-improvement-documents/pull/723) — github.com, 2026-11-09 2. [Nonce Replacement Meta-Proposal · solana-foundation solana-improvement-documents · Discussion #456](https://github.com/solana-foundation/solana-improvement-documents/discussions/456) — github.com, 2026-11-09 --- Basis Desk Newsroom · AI-generated, source-verified · https://basisdesk.news/about/how-we-use-ai