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What are Program Derived Addresses (PDAs) on Solana? This tutorial covers: - Why programs can't sign transactions - How PDAs are derived (seeds + program ID + SHA-256) - The bump seed and elliptic curve check - Why PDAs are deterministic - Common patterns: vaults, escrows, config accounts - TypeScript code walkthrough using @solana/kit Docs: https://solana.com/docs/core/pda #Solana #PDA #Web3 #Blockchain #Crypto #Tutorial #TypeScript