dabit3

How to Give THE Killer Pitch or Hackathon Demo

Examples

Here are some high quality demo day pitches for reference

Orange DAO demos (highly recommended to check out as these are also crypto builders)

Lattice YC Demo Day Pitch (W16)

0xngmi

Introduction

EigenLayer introduces the possibility of re-using ethereum consensus, and IMO the most interesting usecase for that would be building a decentralized two-way and security-optimal bridge between Bitcoin and Ethereum.

All bridges rely on the security of the two chains they connect and the security of the custodian^[1] used for bridging, since if the security of any of those 3 were to fail, it would be possible to drain the bridge (eg: if its possible to double-spend on any of the two chains an attacker can redeem the same coin multiple times).

However, if a significant amount of the total ETH staked were to be restaked securing this bridge, the custodian would be piggybacking on ethereum security, so those two become the same and thus you'd remove the custodian from your list of dependencies and you're left with only having to depend on the security of the two chains, which is the theoretical ceiling of security. In other words, you'd achieve the best possible security.

But not just that, you

dabit3

/*
*   Resources
*   Medium: https://medium.com/walletconnect/how-to-build-a-react-native-dapp-with-walletconnect-28f08f332ed7
*   YouTube: https://www.youtube.com/watch?v=mGtEPQfqMV8
*   Docs: https://docs.walletconnect.com/2.0/advanced/walletconnectmodal/about?platform=react-native
*/ 

import { WalletConnectModal, useWalletConnectModal } from "@walletconnect/modal-react-native"
import { StyleSheet, Text, View, TouchableHighlight } from "react-native"
const projectId = 'my-project-id' // see https://cloud.walletconnect.com/

dabit3

import { WebBundlr } from "@bundlr-network/client"
import { providers } from "ethers"

/* initialize some local state to store the bundlr instance */
const [bundlrInstance, setBundlrInstance] = useState(null)

/* connect to the user's wallet */
async function connect() {
    await window.ethereum.request({ method: 'eth_requestAccounts' })
    const provider = new providers.Web3Provider(window.ethereum)

dabit3

// SPDX-License-Identifier: MIT OR Apache-2.0
pragma solidity ^0.8.4;

import "@openzeppelin/contracts/utils/Counters.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";

contract NFT is ERC721URIStorage {
    using Counters for Counters.Counter;

dabit3

import { useState, useEffect } from 'react'
import Web3 from 'web3'

const [account, setAccount] = useState(null)
let [web3, setWeb3] = useState(null)
useEffect(() => {
  checkAccount()
}, [])

// invoke to connect to wallet account

beautyfree

import {
  Account,
  clusterApiUrl,
  Connection,
  PublicKey,
  sendAndConfirmTransaction,
  SystemProgram,
  Transaction,
} from '@solana/web3.js';

dabit3

GraphQL

GraphQL Schema

type Customer {
  id: ID!
  email: String!
}

dabit3

import React from 'react';
import logo from './logo.svg';
import './App.css';
import ReactPlayer from 'react-player'
import { HashRouter, Link, Switch, Route } from 'react-router-dom'
import AuthComponent from './AuthComponent'
import { Auth, API } from 'aws-amplify'
import { createComment as CreateComment } from './graphql/mutations'
import { listComments as ListComments } from './graphql/queries'
import { onCreateComment as OnCreateComment } from './graphql/subscriptions'

kcwinner

from lib import appsync

def lambda_handler(event, context):
    print(event)

    input = {
        'name': 'test123',
        'description': 'some cool description'
    }