How to transfer an NFT item

NFT transfer is an operation specified in TEP 0062. Its implementation must comply with this standard, and NFT item contracts must support the logic described there. The NFT transfer message is also specified and must comply with the corresponding TL-B scheme. This scheme involves, among other things,

• forward_amount: the amount of nanotons to be sent to the destination address;
• forward_payload: optional custom data that should be sent to the destination address.

For the forward_payload field there are specific requirements:

• In the case of a simple comment, forward_payload must starts with 0x00000000 and the comment must be contained in the remainder of the forward_payload. In turn, if the comment
  • begins with the byte 0xff, the remainder is a “binary comment”, which should not be displayed to the end user as text (only as hex dump if necessary). The intended use of “binary comments” is, e.g., to contain a purchase identifier for payments in a store, to be automatically generated and processed by the store’s software.
  • does not begin with the byte 0xff, the comment is a text one; it can be displayed “as is” to the end user of a wallet.
• If forward_payload contains a binary message for interacting with the destination smart contract, then there are no prefixes.

Use a wallet app that supports NFTs (for example, Tonkeeper) and follow its guide. Alternatively, perform the transfer manually. The example below illustrates a programmatic transfer:

import { WalletContractV5R1, TonClient, Address, toNano } from "@ton/ton";

import { mnemonicToPrivateKey } from "@ton/crypto";

import { AssetsSDK, createApi } from "@ton-community/assets-sdk";

async function main() {
    const client = new TonClient({
        endpoint: "https://toncenter.com/api/v2/jsonRPC",
    });

    const MNEMONIC = process.env.MNEMONIC as string; // set via environment
    const keyPair = await mnemonicToPrivateKey(MNEMONIC.split(" "));

    const wallet = WalletContractV5R1.create({
        workchain: 0,
        publicKey: keyPair.publicKey,
    });

    const provider = client.provider(wallet.address);
    const sender = wallet.sender(provider, keyPair.secretKey);

    const NETWORK = "testnet";
    const api = await createApi(NETWORK);

    const sdk = AssetsSDK.create({
        api,
        sender,
    });

    const NFT_ADDRESS = Address.parse("<NFT_ITEM_ADDR>");
    const nftItem = await sdk.openNftItem(NFT_ADDRESS);

    const RECEIVER_ADDRESS = Address.parse("<RECEIVER_ADDR>");
    await nftItem.send(sender, RECEIVER_ADDRESS, { value: toNano(10) });
}

void main();

where:

• <NFT_ITEM_ADDR> — the address of the NFT item to be transferred.
• <RECEIVER_ADDR> — the address of the recipient.