SIMD Reference

How to Look Up Any SIMD

GitHub

gh api repos/solana-foundation/solana-improvement-documents/contents/proposals/{number}-{slug}.md

Browse

• https://github.com/solana-foundation/solana-improvement-documents/tree/main/proposals

SIMD Status Lifecycle

Draft -> Review -> Accepted -> Implemented -> Activated
                            -> Rejected

Key Solana Concepts

Accounts Model

• Everything is an account (programs, data, tokens)
• Accounts have: owner (program), lamports, data, executable flag
• Programs are stateless — state lives in separate data accounts
• Account size is fixed at creation (rent-exempt if funded)

Rent

• Accounts must maintain minimum balance for rent exemption
• ~0.00089088 SOL per byte (at current rate)
• Rent-exempt = 2 years of rent pre-paid

PDAs (Program Derived Addresses)

• Deterministic addresses derived from seeds + program ID
• Not on the ed25519 curve (no private key)
• Used as program-controlled accounts
• findProgramAddress(seeds, programId) returns canonical PDA + bump

CPIs (Cross-Program Invocations)

• Programs calling other programs
• Max depth: 4 levels
• Signer privileges extend through CPI chain
• PDA signing via invoke_signed

Core SIMDs

See core-simds.md for detailed summaries of key Solana improvement proposals.

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