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NFT Contract V1

Introduction

NFT contract supports defining & managing NFTs(Non-Fungible Tokens). NFT can be thought of as a special kind of custom token where

  • The unit is fixed to 1 and cannot be updated
  • The max issuing amount for a kind of token is fixed to 1.

Note that a NFT contract instance on the VSYS blockchain supports defining multiple NFTs (unlike Token contact which supports defining only 1 kind of token per contract instance).

Usage with JavaScript SDK

Registration

import * as jv from '@virtualeconomy/js-vsys';
// acnt: Account

// Register a new NFT contract
const ctrt = await jv.NFTCtrt.register(acnt);
console.log(ctrt.ctrtId); // print the id of the newly registered contract

Example output

CtrtID { data: 'CF3cK7TJFfw1AcPk74osKyGeGxee6u5VNXD' }

From Existing Contract

import * as jv from '@virtualeconomy/js-vsys';

// ch: Chain

const ncId = "CF3cK7TJFfw1AcPk74osKyGeGxee6u5VNXD";
const nc = new jv.NFTCtrt(ncId, ch);

Querying

Issuer

The address that has the issuing right of the NFT contract instance.

// nc: jv.NFTCtrt

console.log(await nc.getIssuer());

Example output

Addr { data: 'ATse3RcjEzwc5JHDPcduPYe4qA2mWhSNZaV' }

Maker

The address that made this NFT contract instance.

// nc: jv.NFTCtrt

console.log(await nc.getMaker());

Example output

Addr { data: 'ATse3RcjEzwc5JHDPcduPYe4qA2mWhSNZaV' }

Unit

The unit of tokens defined in this NFT contract instance.

As the unit is obviously fixed to 1 for NFTs, the support of querying unit of NFT is for the compatibility with other token-defining contracts.

// nc: jv.NFTCtrt

console.log(await nc.getUnit());

Example output

1

Actions

Issue

Define a new NFT and issue it. Only the issuer of the contract instance can take this action. The issued NFT will belong to the issuer.

import * as jv from '@virtualeconomy/js-vsys';

// acnt: Account
// nc: jv.NFTCtrt

const resp = await nc.issue(acnt);
console.log(resp);

Example output

{
  type: 9,
  id: '7GEDAu2xQtFm1coo7exKUiGQYcCp1c72hN6Xkwpy2c5k',
  fee: 30000000,
  feeScale: 100,
  timestamp: 1654657467768000000,
  proofs: [
    {
      proofType: 'Curve25519',
      publicKey: 'FwuW4LhiBFn6uu5id9nZGtp9o1RUG3DoX5MhyZibrjkE',
      address: 'ATse3RcjEzwc5JHDPcduPYe4qA2mWhSNZaV',
      signature: '4nZnn8DUWveZQLEcSP8MLbxy2BB62xjPhMU166rpfjTacwr31cfV2oN6GYan1imqWSXg756FikmQpfAAkhSKsn3w'
    }
  ],
  contractId: 'CF3cK7TJFfw1AcPk74osKyGeGxee6u5VNXD',
  functionIndex: 1,
  functionData: '12Wfh1',
  attachment: ''
}

Send

Send an NFT to another user.

import * as jv from '@virtualeconomy/js-vsys';

// acnt0: Account
// acnt1: Account
// nc: jv.NFTCtrt

const resp = await nc.send(
  acnt0, // by
  acnt1.addr.data, // recipient
  0 // tokIdx
);
console.log(resp);

Example output

{
  type: 9,
  id: 'CBZcDp8VYpHRAsSedabxtKy4VK8KZSiUXTg3MvxNg8Fh',
  fee: 30000000,
  feeScale: 100,
  timestamp: 1654658097871000000,
  proofs: [
    {
      proofType: 'Curve25519',
      publicKey: 'FwuW4LhiBFn6uu5id9nZGtp9o1RUG3DoX5MhyZibrjkE',
      address: 'ATse3RcjEzwc5JHDPcduPYe4qA2mWhSNZaV',
      signature: '2pFNScc9yknjxP3cGtAvNyNwPvSHWQBqYkTnXgWocv95dGk6KPEsPBVLMCc1fn9kviYyyxvU9B6EGnQ2K7bnSjWK'
    }
  ],
  contractId: 'CF3cK7TJFfw1AcPk74osKyGeGxee6u5VNXD',
  functionIndex: 2,
  functionData: '1bbXGo33yHPwRQiiXCuvbs4p4HHQtakjvHkAd1p49czVD',
  attachment: ''
}

Transfer

Transfer the ownership of an NFT to another account(e.g. user or contract). transfer is the underlying action of send, deposit, and withdraw. It is not recommended to use transfer directly. Use send, deposit, withdraw instead when possible.

import * as jv from '@virtualeconomy/js-vsys';

// acnt0: Account
// acnt1: Account
// nc: jv.NFTCtrt

const resp = await nc.transfer(
  acnt1, // by
  acnt1.addr.data, // sender
  acnt0.addr.data, // recipient
  0 // tokIdx
);
console.log(resp);

Example output

{
  type: 9,
  id: 'BZBDxESE3TVqNZc8riFPPd7ES1qbJd1EhWYh398kLpR4',
  fee: 30000000,
  feeScale: 100,
  timestamp: 1654658405593000000,
  proofs: [
    {
      proofType: 'Curve25519',
      publicKey: 'FwuW4LhiBFn6uu5id9nZGtp9o1RUG3DoX5MhyZibrjkE',
      address: 'ATse3RcjEzwc5JHDPcduPYe4qA2mWhSNZaV',
      signature: '3Hf7T2Ps5HznYbDrYCEYs3GENjf4r64kShVnxAFY5oBWch529DfVSUBkMYXMnHotXoYivuyjeXeVpL7MHL5DyPd7'
    }
  ],
  contractId: 'CF3cK7TJFfw1AcPk74osKyGeGxee6u5VNXD',
  functionIndex: 3,
  functionData: '1Xv7sDVNoccGfJcpGvrbujZAc1vfRFTghwoy7RGpq5ptgC8LpZedPvAj1tDZeHXR2qVd2SSTxZPefpAjyH',
  attachment: ''
}

Deposit

Deposit an NFT to a token-holding contract instance(e.g. lock contract).

Note that only the token defined in the token-holding contract instance can be deposited into it.

import * as jv from '@virtualeconomy/js-vsys';

// acnt0: Account
// lc: jv.LockCtrt
// nc: jv.NFTCtrt

const lcId = lc.ctrtId.data;

const resp = await nc.deposit(
  acnt0, // by
  lcId, // ctrtId
  0 // tokIdx
  );
console.log(resp);

Example output

{
  type: 9,
  id: 'ABbEBEEtianokGQAuKMG2zjCTXNpHWEig8r5r6rBYxrx',
  fee: 30000000,
  feeScale: 100,
  timestamp: 1654660350012000000,
  proofs: [
    {
      proofType: 'Curve25519',
      publicKey: 'FwuW4LhiBFn6uu5id9nZGtp9o1RUG3DoX5MhyZibrjkE',
      address: 'ATse3RcjEzwc5JHDPcduPYe4qA2mWhSNZaV',
      signature: '2p6yvQaebFJL2Ajrugxhu5m6SZhYFtXxzxJxs2Phznwt7XjuWDn3ucs6QYc35FdNcEaxFkrUVwq3haaNvv4GtdLT'
    }
  ],
  contractId: 'CF3cK7TJFfw1AcPk74osKyGeGxee6u5VNXD',
  functionIndex: 4,
  functionData: '1Xv7sDVNoccGfJcpGvrbujZAc1vfRFTghwoy7RH6TbWpZQSKd3f8QsbmQ1ZVJf99u7AiYtUebQeirAzmTM',
  attachment: ''
}

Withdraw

Withdraw an NFT from a token-holding contract instance(e.g. lock contract).

Note that only the one who deposits the token can withdraw.

import * as jv from '@virtualeconomy/js-vsys';

// acnt0: Account
// lc: jv.LockCtrt
// nc: jv.NFTCtrt

const lcId = lc.ctrtId.data;

const resp = await nc.withdraw(
  acnt0, // by
  lcId, // ctrtId
  0 // tokIdx
);
console.log(resp);

Example output

{
  type: 9,
  id: '5FUhSmSKpAQhDxoZD19FBKhekHmNsqGeLbEyLtxguSXq',
  fee: 30000000,
  feeScale: 100,
  timestamp: 1654660613070000000,
  proofs: [
    {
      proofType: 'Curve25519',
      publicKey: 'FwuW4LhiBFn6uu5id9nZGtp9o1RUG3DoX5MhyZibrjkE',
      address: 'ATse3RcjEzwc5JHDPcduPYe4qA2mWhSNZaV',
      signature: '5RQYhA3uwufXVxsr8yF5euwAbeTpUt5749AS4Xu9ed1hkZtaBAgtwzfaFJkiFPmZ46BPaYSSPuCDmZK7FkBtVU8'
    }
  ],
  contractId: 'CF3cK7TJFfw1AcPk74osKyGeGxee6u5VNXD',
  functionIndex: 5,
  functionData: '1Y5SeHoJy5GCVPK7AReyRPVpQNXMdzNZomTwqxHvwMkGq1yVzpZeTR76wsJbzRXPvW4G2LnwTdMxdBk9FV',
  attachment: ''
}

Supersede

Transfer the issuer role of the contract to a new user. The maker of the contract has the privilege to take this action.

import * as jv from '@virtualeconomy/js-vsys';

// acnt0: Account
// lc: jv.LockCtrt
// nc: jv.NFTCtrt

const resp = await nc.supersede(acnt0, acnt1.addr.data);
console.log(resp);

Example output

{
  type: 9,
  id: 'Fd3rE5Aa4RqRr4MB2PcUf7NmdVYscYiwZD4xR9icTxGP',
  fee: 30000000,
  feeScale: 100,
  timestamp: 1654660762216000000,
  proofs: [
    {
      proofType: 'Curve25519',
      publicKey: 'FwuW4LhiBFn6uu5id9nZGtp9o1RUG3DoX5MhyZibrjkE',
      address: 'ATse3RcjEzwc5JHDPcduPYe4qA2mWhSNZaV',
      signature: '5NzQ1XG5mfY9MLXFFj2KKJ1nMZ7Aut8e6ebvrYcSL73bcBLs4uZTVoHdahMBZkAnFk62NMLvi4h8BX6qeyfoqLSS'
    }
  ],
  contractId: 'CF3cK7TJFfw1AcPk74osKyGeGxee6u5VNXD',
  functionIndex: 0,
  functionData: '1bscuQUYkKxix6tJGrWaSXbXzTYAxGAhLZhMZC',
  attachment: ''
}