The Solana Foundation proposes replacing durable nonces with signer programs that preserve cold-key approval while changing which addresses control affected assets. Two designs are competing: Anza’s Programmatic Signer and Blueshift’s Vector, both allowing failed execution attempts to leave approvals executable later. The approximately six-month migration window remains conditional on an audited replacement being live on mainnet, with no fixed removal date for durable nonces. Institutional operators must migrate assets, adapt application access paths and obtain risk-team approval for the new signing workflow, with concerns raised over the use of cross-program invocation (CPI) to deliver approved actions.
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