The Non Transferable Extension

The NonTransferable extension is a Mint account extension that prevents tokens from being transferred between accounts, making them permanently bound to their current holders.

Initializing the Mint Account

To initialie the MintCloseAuthority extension on a Mint account we're going to need the initializeNonTransferableMint() function.

Here's how to create a mint with the Non Transferable extension:

import {
    Keypair,
    SystemProgram,
    Transaction,
    sendAndConfirmTransaction,
} from '@solana/web3.js';
import {
    createInitializeMintInstruction,
    createInitializeMintCloseAuthorityInstruction,
    getMintLen,
    ExtensionType,
    TOKEN_2022_PROGRAM_ID,
} from '@solana/spl-token';
 
const mint = Keypair.generate();
 
// Calculate the size needed for a Mint account with Transfer Fee extension
const mintLen = getMintLen([ExtensionType.MintCloseAuthority]);
 
// Calculate minimum lamports required for rent exemption
const lamports = await connection.getMinimumBalanceForRentExemption(mintLen);
 
// Create the account with the correct size and owner
const createAccountInstruction = SystemProgram.createAccount({
    fromPubkey: keypair.publicKey,
    newAccountPubkey: mint.publicKey,
    space: mintLen,
    lamports,
    programId: TOKEN_2022_PROGRAM_ID,
});
 
// Initialize the Non Transferable extension
const initializeMintNonTransferable = createInitializeNonTransferableMintInstruction(
    mint.publicKey,
    TOKEN_2022_PROGRAM_ID,
);
 
// Initialize the mint itself
const initializeMintInstruction = createInitializeMintInstruction(
    mint.publicKey,
    6,
    keypair.publicKey,
    null,
    TOKEN_2022_PROGRAM_ID,
);
 
// Combine all instructions in the correct order
const transaction = new Transaction().add(
    createAccountInstruction,
    initializeMintNonTransferable,
    initializeMintInstruction,
);
 
const signature = await sendAndConfirmTransaction(connection, transaction, [keypair, mint]);
 
console.log(`Mint created! Check out your TX here: https://explorer.solana.com/tx/${signature}?cluster=devnet`);

Token2022 with Web3.js

The Non Transferable Extension

Initializing the Mint Account