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https://github.com/idouble/simple-game-erc-721-token-template
🔮 Very Simple ERC-721 Smart Contract Template to create your own ERC-721 Tokens on the Ethereum Blockchain, with many customizable options 🔮
https://github.com/idouble/simple-game-erc-721-token-template
blockchain blockchain-technology customizable erc erc-721 erc721 eth ethereum ethereum-contract nft non-fungible non-fungible-token simple smart-contracts solidity solidity-contracts template template-project token unique-token
Last synced: 2 days ago
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🔮 Very Simple ERC-721 Smart Contract Template to create your own ERC-721 Tokens on the Ethereum Blockchain, with many customizable options 🔮
- Host: GitHub
- URL: https://github.com/idouble/simple-game-erc-721-token-template
- Owner: IDouble
- License: mit
- Created: 2018-10-27T02:43:16.000Z (about 6 years ago)
- Default Branch: master
- Last Pushed: 2024-03-01T19:40:08.000Z (10 months ago)
- Last Synced: 2024-12-27T15:36:23.688Z (6 days ago)
- Topics: blockchain, blockchain-technology, customizable, erc, erc-721, erc721, eth, ethereum, ethereum-contract, nft, non-fungible, non-fungible-token, simple, smart-contracts, solidity, solidity-contracts, template, template-project, token, unique-token
- Language: Solidity
- Homepage:
- Size: 771 KB
- Stars: 172
- Watchers: 6
- Forks: 65
- Open Issues: 2
-
Metadata Files:
- Readme: README.md
- Contributing: contributing.md
- License: LICENSE
- Code of conduct: CODE_OF_CONDUCT.md
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README
# 🔮 Simple Game ERC-721 Token Template 🔮
🔮 Very Simple **ERC-721 Smart Contract Template** to create your own **ERC-721 Tokens** on the **Ethereum** Blockchain, with many customizable Options 🔮
## 💎 What is ERC-721? 💎
**ERC-721** is a free, open standard that describes how to build non-fungible or unique tokens on the Ethereum blockchain. While most tokens are fungible (every token is the same as every other token), **ERC-721 Tokens** are all unique.
One of the most known examples for an **ERC-721 Token** is Crypto Kitties (https://www.cryptokitties.co/), where each Cat is an unique **ERC-721 Token**. 😺
## ⚙️ Setup ⚙️
Each Line of the **Solidity Code** has a comment that explains what is happening. 📝
The Setup is fairly easy, you just need to click on the [Remix link](https://remix.ethereum.org/#version=soljson-v0.4.25+commit.59dbf8f1.js&optimize=false&gist=6dfc6f9a27c0e6220094943657e3d834) or use the [Gist link](https://gist.github.com/AYIDouble/6dfc6f9a27c0e6220094943657e3d834) and you're done.
If you have problems with it, you can also do it the good old way and add each file separately. (Takes about 1 minute)
Remix IDE Link: https://remix.ethereum.org/#version=soljson-v0.4.25+commit.59dbf8f1.js&optimize=false&gist=6dfc6f9a27c0e6220094943657e3d834
GitHub Gist Link: https://gist.github.com/AYIDouble/6dfc6f9a27c0e6220094943657e3d834
## [📝 Remix - Solidity IDE 📝](https://remix.ethereum.org/#version=soljson-v0.4.25+commit.59dbf8f1.js&optimize=false&gist=6dfc6f9a27c0e6220094943657e3d834)
### Explanation of the Code:
At Line **5–9**: In the **struct** the **Item** with all his properties is defined (**name**, **level**, **rarityLevel**).
At Line **11**: An Array is created, where all the **Items** of the contract **owner** are stored.
At Line **14–16**: We define that the **owner** is the user of the contract.
At Line **18**: We define a function **createItem**, where the **name** (**_name**) of the **Item** is a parameter and the Ethereum address (**_to**) where we want to send our **Items**.
At Line **19**: We define that only the **owner** of the contract is able to create **Items**.
At Line **20**: Each time we create an **Item** the current Length of the **Item** array is being used as the ID for the **Item**. (Each **Item** has a unique ID)
At Line **21**: The **Item** gets created and added to our **Items** array
At Line **22**: The **_mint** function from the ERC721 Libraries is used for sending our **Items** to the specific ethereum address. As an example, this is needed to send the created **Item** to your ethereum address or any other address.
## ⚔️ Item.sol ⚔️ (ERC-721 Token)
In this small example we are creating an ERC-721 Token, that could be used as an in-game Item. ⚔️
**Example: a Sword as a Item saved in the Ethereum Blockchain.**
```
pragma solidity ^0.4.24;
contract Item is ERC721{
struct Item{
string name; // Name of the Item
uint level; // Item Level
uint rarityLevel; // 1 = normal, 2 = rare, 3 = epic, 4 = legendary
}
Item[] public items; // First Item has Index 0
address public owner;
function Item() public {
owner = msg.sender; // The Sender is the Owner; Ethereum Address of the Owner
}
function createItem(string _name, address _to) public{
require(owner == msg.sender); // Only the Owner can create Items
uint id = items.length; // Item ID = Length of the Array Items
items.push(Item(_name,5,1)) // Item ("Sword",5,1)
_mint(_to,id); // Assigns the Token to the Ethereum Address that is specified
}
}
```
