ERC-1155 multi-token standard in Blockchain / Solidity - Mini Project: Build & Apply

ERC-1155 Multi-Token Standard Basic Contract

📖 Scenario: You are creating a simple blockchain contract to manage multiple types of tokens in one place. This is useful for games or collectibles where you want to handle many items efficiently.

🎯 Goal: Build a basic ERC-1155 contract that can hold different token types and allow minting new tokens.

📋 What You'll Learn

Create a contract named MyMultiToken that inherits from ERC1155

Set the base URI to https://token-cdn-domain/{id}.json

Create a public function mint that allows minting a specific amount of a token ID to an address

Use the _mint function from ERC1155 inside mint

Print the token URI for a given token ID

💡 Why This Matters

🌍 Real World

ERC-1155 contracts are used in blockchain games and digital collectibles to manage many token types efficiently in one contract.

💼 Career

Understanding ERC-1155 is important for blockchain developers working on NFTs, gaming, and multi-token platforms.

1

Set up the ERC-1155 contract

Write a Solidity contract named MyMultiToken that inherits from ERC1155. Set the constructor to call ERC1155 with the URI "https://token-cdn-domain/{id}.json".

Blockchain / Solidity

// Your code here

Need a hint?

Use contract MyMultiToken is ERC1155 and call the parent constructor with the URI.

2

Add a mint function

Add a public function named mint that takes address to, uint256 id, and uint256 amount as parameters. Inside it, call _mint(to, id, amount, "").

Blockchain / Solidity

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC1155/ERC1155.sol";

contract MyMultiToken is ERC1155 {
    constructor() ERC1155("https://token-cdn-domain/{id}.json") {
    }

    // Your code here
}

Need a hint?

Create a mint function that calls _mint with the given parameters and empty data.

3

Add a function to get token URI

Add a public view function named getTokenURI that takes uint256 id and returns a string memory. Inside, return the result of uri(id).

Blockchain / Solidity

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC1155/ERC1155.sol";

contract MyMultiToken is ERC1155 {
    constructor() ERC1155("https://token-cdn-domain/{id}.json") {
    }

    function mint(address to, uint256 id, uint256 amount) public {
        _mint(to, id, amount, "");
    }

    // Your code here
}

Need a hint?

Use the inherited uri function to get the token URI for the given id.

4

Test minting and getting token URI

Write a comment showing how to call mint to mint 10 tokens of ID 1 to address 0x123.... Then write a comment showing how to call getTokenURI for token ID 1.

Blockchain / Solidity

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC1155/ERC1155.sol";

contract MyMultiToken is ERC1155 {
    constructor() ERC1155("https://token-cdn-domain/{id}.json") {
    }

    function mint(address to, uint256 id, uint256 amount) public {
        _mint(to, id, amount, "");
    }

    function getTokenURI(uint256 id) public view returns (string memory) {
        return uri(id);
    }

    // Your code here
}

Need a hint?

Show example calls as comments with the exact address and token ID.