ExplorerChem

use anchor_lang::prelude::*;use anchor_lang::system_program;use anchor_spl::{associated_token::AssociatedToken, token_2022::{self, Token2022, TransferChecked, CloseAccount}, token_interface::{Mint, TokenAccount}};use crate::state::*;use crate::error::ExploreChemRwaError as MarketError;#[derive(Accounts)]pub struct ListRwa<'info> {    #[account(mut)] pub seller: Signer<'info>,    #[account(seeds=[b"config"], bump=config.bump)]    pub config: Box<Account<'info, Config>>,    #[account(seeds=[b"series", series.series_id.as_ref()], bump=series.bump)]    pub series: Box<Account<'info, Series>>,    #[account(seeds=[b"rwa-mint", series.series_id.as_ref()], bump=mint_record.bump, constraint=mint_record.series_id==series.series_id, constraint=mint_record.mint==mint.key())]    pub mint_record: Box<Account<'info, RwaMintRecord>>,    #[account(address=mint_record.mint, constraint=mint.supply==1, constraint=mint.decimals==0)]    pub mint: Box<InterfaceAccount<'info, Mint>>,    #[account(mut, token::mint=mint, token::authority=seller, token::token_program=token_program, constraint=seller_token.amount==1)]    pub seller_token: Box<InterfaceAccount<'info, TokenAccount>>,    #[account(init, payer=seller, space=8+Listing::INIT_SPACE, seeds=[b"listing", series.series_id.as_ref()], bump)]    pub listing: Box<Account<'info, Listing>>,    #[account(mut, associated_token::mint=mint, associated_token::authority=listing, associated_token::token_program=token_program, constraint=escrow.amount==0)]    pub escrow: Box<InterfaceAccount<'info, TokenAccount>>,    pub token_program: Program<'info, Token2022>,    pub associated_token_program: Program<'info, AssociatedToken>,

1. Line 3 use anchor_spl::{associated_token::AssociatedToken, token_2022::{self, Token2022, Transfer: A checked token transfer, which also verifies the mint and decimals.
2. Line 3 use anchor_spl::{associated_token::AssociatedToken, token_2022::{self, Token2022, Transfer: Targets the Token-2022 program instead of the original Token Program.
3. Line 8 #[account(mut)] pub seller: Signer<'info>,: Requires this account to have signed the transaction.
4. Line 9 #[account(seeds=[b"config"], bump=config.bump)]: Declares the PDA seeds. Anchor re-derives the address and rejects the account if it doesn't match.
5. Line 9 #[account(seeds=[b"config"], bump=config.bump)]: Uses the bump seed, the extra byte that pushes the derived address off the ed25519 curve.
6. Line 19 #[account(init, payer=seller, space=8+Listing::INIT_SPACE, seeds=[b"listing", series.serie: Creates and pays for a new account. Space and payer must be specified.

    #[account(mut, seeds=[b"credit-lineage-v2"], bump=lineage.bump)]    pub lineage: Box<Account<'info, LineageRegistry>>,    pub token_program: Program<'info, Token2022>,} pub fn handle_cancel_rwa(ctx: Context<CancelRwa>, history_hash: [u8;32]) -> Result<()> {    require!(history_hash != [0;32], crate::error::ExploreChemRwaError::Invalid);    ctx.accounts.lineage.require_reserved(ctx.accounts.series.series_id)?;    token_2022::burn(CpiContext::new(ctx.accounts.token_program.key(), Burn {        mint: ctx.accounts.mint.to_account_info(), from: ctx.accounts.holder_token.to_account_info(),        authority: ctx.accounts.holder.to_account_info(),    }), 1)?;    ctx.accounts.series.economic_status = 3;    ctx.accounts.lineage.release(ctx.accounts.series.series_id);    emit!(RwaCancelled { series_id: ctx.accounts.series.series_id, mint: ctx.accounts.mint.key(),        holder: ctx.accounts.holder.key(), history_hash });    Ok(())} #[event]pub struct RwaCancelled { pub series_id: [u8;32], pub mint: Pubkey, pub holder: Pubkey, pub history_hash: [u8;32] }

1. Line 37 #[account(mut, seeds=[b"credit-lineage-v2"], bump=lineage.bump)]: Declares the PDA seeds. Anchor re-derives the address and rejects the account if it doesn't match.
2. Line 37 #[account(mut, seeds=[b"credit-lineage-v2"], bump=lineage.bump)]: Uses the bump seed, the extra byte that pushes the derived address off the ed25519 curve.
3. Line 39 pub token_program: Program<'info, Token2022>,: Targets the Token-2022 program instead of the original Token Program.
4. Line 43 require!(history_hash != [0;32], crate::error::ExploreChemRwaError::Invalid);: An explicit validation that aborts the instruction with an error.
5. Line 45 token_2022::burn(CpiContext::new(ctx.accounts.token_program.key(), Burn {: Makes a cross-program invocation into another program.
6. Line 51 emit!(RwaCancelled { series_id: ctx.accounts.series.series_id, mint: ctx.accounts.mint.key: Emits an Anchor event that clients can parse from the logs.

    pub authority: Signer<'info>,    #[account(mut, seeds = [b"config"], bump = config.bump, has_one = authority)]    pub config: Account<'info, Config>,} pub fn handle_update_source_config(    ctx: Context<UpdateSourceConfig>,    source_chain_id: u64,    source_lots_contract: [u8; 20],) -> Result<()> {    require!(source_chain_id != 0, ExploreChemRwaError::InvalidSource);    require!(source_lots_contract != [0u8; 20], ExploreChemRwaError::InvalidSource);    let config = &mut ctx.accounts.config;    emit!(SourceConfigUpdated {        authority: config.authority,        previous_chain_id: config.source_chain_id,        previous_lots_contract: config.source_lots_contract,        source_chain_id,        source_lots_contract,    });    config.source_chain_id = source_chain_id;    config.source_lots_contract = source_lots_contract;    Ok(())}

1. Line 73 pub authority: Signer<'info>,: Requires this account to have signed the transaction.
2. Line 74 #[account(mut, seeds = [b"config"], bump = config.bump, has_one = authority)]: Declares the PDA seeds. Anchor re-derives the address and rejects the account if it doesn't match.
3. Line 74 #[account(mut, seeds = [b"config"], bump = config.bump, has_one = authority)]: Uses the bump seed, the extra byte that pushes the derived address off the ed25519 curve.
4. Line 74 #[account(mut, seeds = [b"config"], bump = config.bump, has_one = authority)]: Checks that a stored pubkey field matches the passed account.
5. Line 83 require!(source_chain_id != 0, ExploreChemRwaError::InvalidSource);: An explicit validation that aborts the instruction with an error.
6. Line 86 emit!(SourceConfigUpdated {: Emits an Anchor event that clients can parse from the logs.

        );    } else {        require_keys_eq!(            config.payment_mint,            OFFICIAL_USDT_MINT,            ExploreChemRwaError::WrongPaymentMint        );    }    Ok(())} // Configuracao imutavel: atualizar o programa nao altera a moeda de ofertas existentes.#[derive(Accounts)]pub struct InitializeUsdtPayments<'info> {    #[account(mut, address=config.authority @ ExploreChemRwaError::UnauthorizedPaymentAdmin)]    pub authority: Signer<'info>,    #[account(seeds=[b"config"], bump=config.bump)]    pub config: Box<Account<'info, Config>>,    #[account(init, payer=authority, space=8+UsdtPaymentConfig::INIT_SPACE, seeds=[b"usdt-payments"], bump)]    pub payment_config: Box<Account<'info, UsdtPaymentConfig>>,    #[account(constraint=payment_mint.decimals==USDT_DECIMALS @ ExploreChemRwaError::InvalidPaymentToken)]    pub payment_mint: Box<Account<'info, token::Mint>>,    pub payment_token_program: Program<'info, token::Token>,    pub system_program: Program<'info, System>,

1. Line 39 require_keys_eq!(: An explicit validation that aborts the instruction with an error.
2. Line 52 pub authority: Signer<'info>,: Requires this account to have signed the transaction.
3. Line 53 #[account(seeds=[b"config"], bump=config.bump)]: Declares the PDA seeds. Anchor re-derives the address and rejects the account if it doesn't match.
4. Line 53 #[account(seeds=[b"config"], bump=config.bump)]: Uses the bump seed, the extra byte that pushes the derived address off the ed25519 curve.
5. Line 55 #[account(init, payer=authority, space=8+UsdtPaymentConfig::INIT_SPACE, seeds=[b"usdt-paym: Creates and pays for a new account. Space and payer must be specified.