Solana nonce deprecation draft cannot take effect before May 5, 2027

Anza developers have submitted a Solana protocol change draft, SIMD-0723, to deprecate durable nonces—the feature that lets transactions be signed offline using a stored account value instead of a recent blockhash. The proposal guarantees users at least six months of transition time from submission and bars mainnet activation before May 5, 2027, which is the earliest possible date rather than a fixed deadline. Durable nonces matter because they allow pre-signed transactions to be submitted later, supporting offline signing and multi-party workflows that would otherwise be constrained by blockhash expiry. The draft remains under review, so the key things to watch are community feedback on SIMD-0723 and whether the deprecation timeline or transition period changes before any activation vote.