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

Anza has proposed removing Solana’s durable nonce feature, the mechanism that lets a transaction be signed now and submitted later, after Drift attributed its $295.7 million exploit to the tool. The draft plan bars activation of the change before May 5, 2027, giving custodians roughly a six-month window to adapt. The feature has been widely used by institutional and custody providers that rely on pre-signed transactions for delayed settlement and offline signing workflows. The proposal matters because removing durable nonces would force those providers to rework transaction handling on Solana, potentially affecting settlement timing and key-management practices. What to watch next is how custodians and other major users respond during the comment period and whether the May 2027 activation date holds.