Blockchain-SACCO

 # Well-known Solana program IDs._TOKEN_PROGRAM_ID = Pubkey.from_string("TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA")_ASSOCIATED_TOKEN_PROGRAM_ID = Pubkey.from_string("ATokenGPvbdGVxr1b2hvZbsiqW5xWH25efTNsLJA8knL")_SYSTEM_PROGRAM_ID = Pubkey.from_string("11111111111111111111111111111111") # USDC has 6 decimal places._USDC_DECIMALS = 6  class DisburseResult(NamedTuple):    tx_signature: str    error: str | None = None  def _get_ata(wallet: Pubkey, mint: Pubkey) -> Pubkey:    """Derive the Associated Token Account (ATA) address for a given owner and mint."""    seeds = [bytes(wallet), bytes(_TOKEN_PROGRAM_ID), bytes(mint)]    ata, _ = Pubkey.find_program_address(seeds, _ASSOCIATED_TOKEN_PROGRAM_ID)    return ata  def _create_ata_idempotent_instruction(    payer: Pubkey, owner: Pubkey, mint: Pubkey, ata: Pubkey

1. Line 42 seeds = [bytes(wallet), bytes(_TOKEN_PROGRAM_ID), bytes(mint)]: Declares the PDA seeds. Anchor re-derives the address and rejects the account if it doesn't match.
2. Line 43 ata, _ = Pubkey.find_program_address(seeds, _ASSOCIATED_TOKEN_PROGRAM_ID): Derives a PDA from seeds and the program ID and returns the address with its canonical bump.

         memo_ix = Instruction(            program_id=_MEMO_PROGRAM_ID,            accounts=[AccountMeta(pubkey=payer, is_signer=True, is_writable=False)],            data=memo_bytes,        )         bh_resp = _rpc(rpc_url, "getLatestBlockhash", [{"commitment": "confirmed"}])        recent_blockhash = Hash.from_string(bh_resp["result"]["value"]["blockhash"])         tx = Transaction.new_signed_with_payer(            instructions=[memo_ix],            payer=payer,            signing_keypairs=[keypair],            recent_blockhash=recent_blockhash,        )         import base64  # noqa: PLC0415        tx_b64 = base64.b64encode(bytes(tx)).decode("utf-8")        send_resp = _rpc(            rpc_url,            "sendTransaction",            [tx_b64, {"encoding": "base64", "preflightCommitment": "confirmed"}],        )

1. Line 56 bh_resp = _rpc(rpc_url, "getLatestBlockhash", [{"commitment": "confirmed"}]): Fetches a recent blockhash. Transactions expire if it gets too old.
2. Line 70 "sendTransaction",: Submits the signed transaction to the cluster.