Solana developers have proposed removing durable nonces, a transaction feature that lets signed transactions remain valid beyond the normal blockhash window. SIMD-0723, opened on November 5, would require every transaction to use a recent blockhash and disable System Program instructions for nonce accounts. The proposal follows renewed scrutiny after durable nonces were used in the $270 million Drift exploit, although the draft itself does not cite Drift.
Solana’s network now runs 200-millisecond slots, cutting normal blockhash validity to about 30 seconds. Durable nonces extend that window for use cases such as offline signing by custodians and exchanges, but Solana says the feature has also created security bugs, blocked asynchronous execution and attracted spam. Under the deprecation plan, replacement functionality would move into on-chain programs rather than remain inside the runtime.
The change is not yet approved or scheduled for immediate activation. Solana says durable nonces will continue working until a replacement is audited and live on mainnet, followed by an expected migration window of roughly six months. SIMD-0723 also remains an open pull request requiring technical approvals before it can be merged. The next milestone is therefore approval of the proposal and readiness of a replacement signing program.
Source: Solana ; Solana Improvement Documents .
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