Solana is considering removing the durable nonce feature, a transaction mechanism exploited in the Drift attack, which caused losses of at least $270 million. The proposal, SIMD-0723, was submitted on November 5, with the earliest possible activation date of May 5, 2027. Durable nonce allows signed transactions to remain valid for extended periods, rather than expiring after approximately 30 seconds like standard transactions. Exchanges and custodial institutions will need alternative solutions if this proposal is approved. I see this as a necessary change to reduce risk, but the new system must be thoroughly tested before phasing out the old mechanism.