Anza developer files SIMD-0723 to retire durable nonce instructions

Unchained reported that Anza developer Gabe Rodriguez filed SIMD-0723 on November 5, proposing the retirement of durable nonces. The proposal would disable the initialize, advance and upgrade instructions for nonce accounts. Withdraw and authorize-change instructions would keep working, and existing nonce accounts would be left untouched, according to the filing.

The draft sets a migration window of at least six months from the filing date and says mainnet-beta activation should not occur before May 5, 2027. Custodians and exchanges that rely on air-gapped approvals are described as the most affected group. Michael Gutkin of Fireblocks wants a migration period of at least 12 months, and the proposal rejects compatibility wrapping for pre-signed transactions. It names Programmatic Signer and Vector as suggested replacements.

The draft also points to a 2022 bug that stalled mainnet for about 4.5 hours. Drift has said the nonce attack surface was central to its April 1 exploit. The proposal's status remains Draft, with no pull request approvals so far.