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listen.js
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listen.js
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const ethers = require('ethers');
const abi = require('./PRINTS_abi.json')
async function main() {
const contractAddr = "0x4dd28568D05f09b02220b09C2cb307bFd837cb95";
const provider = new ethers.providers.WebSocketProvider("wss://eth-mainnet.alchemyapi.io/v2/" + process.env.ALCHEMY_API_KEY);
const contract = new ethers.Contract(contractAddr, abi, provider)
let wallets = {};
let eventFilter = contract.filters.Transfer()
let events = await contract.queryFilter(eventFilter);
// Replay all transfer events
for (const evt of events) {
for (const addr of [evt.args.from, evt.args.to]) {
if (!(addr in wallets)) {
wallets[addr] = ethers.BigNumber.from(0);
}
}
wallets[evt.args.from] = wallets[evt.args.from].sub(evt.args.value);
wallets[evt.args.to] = wallets[evt.args.to].add(evt.args.value);
}
const wei = ethers.BigNumber.from(10).pow(18);
for (const addr in wallets) {
console.log(`${addr}, ${wallets[addr].div(wei).toString()}`)
}
}
main()
.then(() => process.exit(0))