Moving tokens between accounts is usually pretty boring. It's typically done through basic ERC20 transfers. Say I transfer you 100 DAI - this causes my balance to go down by 100 and yours to go up by 100.
Superfluid's smart contract framework takes this a step forward by introducing a new token standard, called the Super Token.
The Super Token extends the basic ERC20 transfer functionality to include Super Agreements. These Super Agreements give us new and more powerful ways to move tokens on-chain!
The Constant Flow Agreement (CFA) is the most popular Super Agreement and lets us stream our Super Tokens. What does streaming even mean?
Streaming refers to the by-the-second movement of tokens between accounts. Imagine Alice is streaming to Bob at a flow rate of 1 DAIx/second. This means that with every passing second, Alice's balance is increasing by 1 DAI and Bob's is decreasing.
Want to learn more? A more holistic explainer of Superfluid can be found here.
Interacting with the Flower NFT Contract is simple - you start by creating a stream of acceptedToken to the Flower contract.
The Flower contract reacts and mints a Flower NFT to your address. As your stream goes on, the metadata of the Flower NFT will graduate images as the amount you've streamed so far into the contract increases. You can increase/decrease your flow rate or delete your stream as you please!
Addresses can only have one Flower NFT at once. If you transfer your Flower to another address (that doesn't already have a Flower), you will have your acceptedToken stream automatically cancelled if you haven't already done so. The metadata on the NFT will be unchanged (not reset to the first image) after the transfer.
- Clone the repo and build with
npm install - Create a
.envfile and fill out the suggested variables from.env.template- Make sure the wallet you're providing a private key for has some Goerli ETH in it. This wallet will be receiving the Flower NFT!
- Mint some WATERx Super Tokens with
npx hardhat run scripts/mintSuperWater.js --network goerli - Stream the WATERx Super Tokens to the Flower contract with
npx hardhat run scripts/streamWater.js --network goerli - Go to Opensea's Testnet App and search your address.
- You should see an "Evolving Flower NFT". That's it! You are now watering the NFT. Note down its token ID
- After 5 minutes, go to this NFT Viewer, click into the "Smart Contract" page. Then, enter the contract address
npx hardhat verify --network goerli --constructor-args arguments-flower-goerli.js 0x015b0C429B9cC32AB8470c3cb3E11AB548cBe996and your token ID.
You'll see the NFT image has changed to show a more grown up flower! If you wait another 5 minutes, you'll see it grows again.
