Anza’s Plan to Kill Solana’s Durable Nonces Puts Custodians on a Six-Month Clock

Gabe Rodriguez of Anza , a core developer of Solana’s validator software, filed a Solana Improvement Document (SIMD), the network’s formal process for protocol changes, on Nov. 5 that would retire durable nonces . A durable nonce is a stored value in a dedicated account that stands in for a recent blockhash, the short-lived reference to a recent block that every Solana transaction normally carries. It lets a transaction be signed now and sent much later. Under SIMD-0723 , “every transaction needs a recent blockhash” once the change activates. That reference goes stale after 150 blocks, and the transaction can no longer land.

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