SIMD-0690: Hash validation in program upgrades

SIMD-0690 (Hash validation in program upgrades) is a Core Standard Solana Improvement Document by Joe Caulfield (Anza), febo (Anza); proposal status Review.

Its feature gate is not active on mainnet-beta, testnet and devnet yet.

Feature gates

• Feature gate: SIMD-0690: Hash validation in Core BPF program migrations and upgrades

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