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Blockopoly World and Land Token Contracts

• Using OpenZeppelin 1.11.0 framework for best security and stability
• Token is ERC721 non-fungible token standard
• Using lateset Solidity 0.4.24 at the time of writing
• Using async/awake and Chai for clean and readable test code
• Flattened scripts using truffle-flattener, for deploying to Remix without using truffle

What's Block42 World

A world is a separated planet, which having number of lands. In Block42 universe, there can be unlimited number of parallel worlds (capped by uint32, i.e. 4.3B, but is way enough). A world is an ERC721 token which can be owned. The owner of first few worlds will be us, and we will give / sell the ownership of world to anyone who are passionate to contribute to Block42 community.

What's Block42 Land

In each world, there's a number of lands. Each land is also an ERC721 token. World creators can create arbitrary number of lands, given the x, y positions, width and height of the land. Positions are capped to be within +/- 1T. Width and height should be under 65k and must be a odd number, to avoid using floating numbers. Lands should not be overlapping each other. A land's uint256 token ID is encoded from (worldId, x, y) and should always be unique. After world creator creating the new land, he can give / sell to anymore. The land owner then can construct voxel buildings and decorations in his own land, using our web app or standalone client. A voting and rewarding system may be introduced in later stage, for incentivizing players who build good content in their lands, as well as prohibiting illegal content.

Getting Started

Requirements

• Node.js 10.7.x
• truffle npm install -g truffle
• ganache-cli npm install -g ganache-cli
• truffle-flattener npm install -g truffle-flattener (Optional)

Install dependencies

npm i

Start Ganache CLI to run a local private blockchain, or use GUI Ganache

ganache-cli

Compile the contracts

truffle compile

Deploy contracts to the local environment

truffle migrate

Run test

truffle test

Create flattened scripts (Optional to deploy at Remix)

truffle-flattener contracts/World.sol > contracts_flattened/World.sol
truffle-flattener contracts/Land.sol > contracts_flattened/Land.sol

Contract Address

Kovan

• World.sol: 0x59c1f440e53509e29915e2ddcc3b9cafab77179a
• Land.sol: 0xa2b3f2f1ffb050e93807244bcd94886d2b6556ca

TODO

• Complete all test cases
• Add Travis CI badge
• Add CoverAlls badge
• Add maketplace

License

Code released under the MIT License.