• NPM or YARN

It is essentially a smart contract that an address can call to mint unique bitcoin price charts and own the token to the chart. Anyone can mint bitcoin price charts here for free!

• go to the frontend at
• connect to your wallet
• more TODOs:

git clone https://github.com/greenstone-development/Crypto-Chart-Contracts
cd Crypto-Chart-Contracts

then

npm install

Or

yarn

npx hardhat compile

Deployment scripts are in the deploy directory. If required, edit the desired environment specific variables or constructor parameters in each script, then run the hardhat deployment plugin as follows. If no network is specified, it will default to the Kovan network.

This will deploy to a local hardhat network

npx hardhat deploy

To deploy to testnet:

npx hardhat deploy --network rinkeby

Tests should be located in the test directory, and are split between unit tests and integration tests. Unit tests should only be run on local environments, and integration tests should only run on live environments.

To run unit tests:

yarn test

To run integration tests:

yarn test-integration

The deployment output will give you the contract addresses as they are deployed. You can then use these contract addresses in conjunction with Hardhat tasks to perform operations on each contract.

You can set these in your .env file if you're unfamiliar with how setting environment variables work. Check out our .env example. If you wish to use this method to set these variables, update the values in the .env.example file, and then rename it to '.env'

Don't commit and push any changes to .env files that may contain sensitive information, such as a private key! If this information reaches a public GitHub repository, someone can use it to check if you have any Mainnet funds in that wallet address, and steal them!

If you plan on deploying to a local Hardhat network that's a fork of the Ethereum mainnet instead of a public test network like Kovan, you'll also need to set your MAINNET_RPC_URL environment variable. and uncomment the forking section in hardhat.config.js. You can get one for free at Alchemy's site..

You can also use a PRIVATE_KEY instead of a MNEMONIC environment variable by uncommenting the section in the hardhat.config.js, and commenting out the MNEMONIC line.

The Price Feeds consumer contract has one task, to read the latest price of a specified price feed contract

npx hardhat read-price-feed --contract insert-contract-address-here --network network

You'll need an ETHERSCAN_API_KEY environment variable. You can get one from the Etherscan API site.

npx hardhat verify --network <NETWORK> <CONTRACT_ADDRESS> <CONSTRUCTOR_PARAMETERS>

example:

npx hardhat verify --network rinkeby 0x9279791897f112a41FfDa267ff7DbBC46b96c296 "0x9326BFA02ADD2366b30bacB125260Af641031331"

sometimes verifying may give you a bizarre error that looks like this [Error: ENOENT: no such file or directory, open '/Users///NFT-demos/crypto-charts-contracts/artifacts/build-info/d4c83a0b3e1f40f4c5980f3173aa6683.json']

just run

npx hardhat clean

and try to verify again

yarn lint:fix

1. Adding access control to allow only particular addresses that are token buyers to mint tokens.
2. Adding Voucher signature pattern to defer gas fees to moment of buying token.
3. Adding pricing to actually buy cryptocharts