RMRK Solidity

A set of Solidity contracts for RMRK.app.

Please note that any implementations which are not marked //////EXAMPLE////// will not include any externally accessible functions which may modify the state of a user-owned token without that user's express authorization. Implementers are advised to inherit from these contracts and create a top-level wrapper that defines the logic of these functions as per the needs of their own deployment.

Multiresource

Interface

This interface defines the standard for RMRK multi-resource tokens. While this repository will not enforce inheritance from another interface that defines a spec for token provenance or transfer, please note that most practical implementations will do so, the implementation provided in this repository included.

Implementation

Provided are two examples of a RMRK multiresource token -- one which inherits from ERC721, and one which inherits from RMRK nesting, which may be considered a ERC721 compatible replacement.

Settings

TBD

A storage contract containing values like the RMRK Fungibilization deposit (how many tokens you need to make an NFT into a collection of fungibles) and other governance-settable values.

Equip

TBD

Equipping and Base entity.

Emotable

TBD

Emotes are useful, but very expensive to store. Some important considerations are documented here: https://github.com/rmrk-team/pallet-emotes and here: https://hackmd.io/JjqT6THTSoqMj-_ucPEJAw?view - needs storage oprimizations considerations vs wasting gas on looping. Benchmarking would be GREAT.

Fractional

TBD

Turning NFTs into fractional tokens after a deposit of RMRK. The deposit size should be read from Settings.

Logic

TBD

JSONlogic for front-end variability based on on-chain values. Logic should go into a Logic field of the NFT's body, and is executed exclusively in the client.

Harberger

TBD

An extension for the contracts to make them Harberger-taxable by default, integrating the selling and taxing functionality right into the NFT's mint. This does mean the NFT can never not be Harb-taxed, but there can be an on-off flag for this that the ultimate owner (a new owner type?) can flip.

Develop

Just run npx hardhat compile to check if it works. Refer to the rest below.

This project demonstrates an advanced Hardhat use case, integrating other tools commonly used alongside Hardhat in the ecosystem.

The project comes with a sample contract, a test for that contract, a sample script that deploys that contract, and an example of a task implementation, which simply lists the available accounts. It also comes with a variety of other tools, preconfigured to work with the project code.

Try running some of the following tasks:

npx hardhat accounts
npx hardhat compile
npx hardhat clean
npx hardhat test
npx hardhat node
npx hardhat help
REPORT_GAS=true npx hardhat test
npx hardhat coverage
npx hardhat run scripts/deploy.ts
TS_NODE_FILES=true npx ts-node scripts/deploy.ts
npx eslint '**/*.{js,ts}'
npx eslint '**/*.{js,ts}' --fix
npx prettier '**/*.{json,sol,md}' --check
npx prettier '**/*.{json,sol,md}' --write
npx solhint 'contracts/**/*.sol'
npx solhint 'contracts/**/*.sol' --fix

Etherscan verification

To try out Etherscan verification, you first need to deploy a contract to an Ethereum network that's supported by Etherscan, such as Ropsten.

In this project, copy the .env.example file to a file named .env, and then edit it to fill in the details. Enter your Etherscan API key, your Ropsten node URL (eg from Alchemy), and the private key of the account which will send the deployment transaction. With a valid .env file in place, first deploy your contract:

hardhat run --network ropsten scripts/sample-script.ts

Then, copy the deployment address and paste it in to replace DEPLOYED_CONTRACT_ADDRESS in this command:

npx hardhat verify --network ropsten DEPLOYED_CONTRACT_ADDRESS "Hello, Hardhat!"

Performance optimizations

For faster runs of your tests and scripts, consider skipping ts-node's type checking by setting the environment variable TS_NODE_TRANSPILE_ONLY to 1 in hardhat's environment. For more details see the documentation.