Unchained reports on Anza’s proposal to phase out durable nonce in Solana. The mechanism allows transactions to be sent some time after signing, but SIMD-0723 requires using a recent blockhash that remains valid for 150 blocks.
The transition period would be at least six months from November 5. The mainnet launch must not happen before May 5, 2027; the proposal has not yet been approved.
The change will require organizations that sign transactions offline and send them later to review their processes. Proposed alternatives include Anza’s Programmatic Signer and Blueshift’s Vector.