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Apr 27, 2023 at 19:19 comment added Ademola This is a security check that the account we're loading our accountinfo from is valid. We know the seeds of the mint account and so we can always derive its key on-chain. We check that the key of the account passed in as the mint matches that derived key, to guard against a client passing in the wrong account and compromising the program
Apr 26, 2023 at 20:33 comment added Gilsson Need to clarify yet one moment with PDA. What happens here let (mint_pda, _mint_bump) = Pubkey::find_program_address(&[b"token_mint"], program_id); let (mint_auth_pda, mint_auth_bump) = Pubkey::find_program_address(&[b"token_auth"], program_id); if *token_mint.key != mint_pda { return Err(StudentIntroError::InvalidPDA.into()); } if *mint_auth.key != mint_auth_pda { return Err(StudentIntroError::InvalidPDA.into()); } . We find PDA off the eliptic curve, but then we can compare it with another account.
Apr 26, 2023 at 20:23 vote accept Gilsson
Apr 26, 2023 at 19:48 history answered Ademola CC BY-SA 4.0