Ling Qing Meng lingqingmeng

How to do well in the Hackathon

Message lingqingmeng in Slack or on telegram https://t.me/lingqingmeng

Get code to work in pieces everything

Break down functionality in small modular chunks, this way you are able to know exactly where the bug arises. Verify the success case works (positive test)
Ask questions early and often. It takes 10x longer to google something than it takes to ask one of us the question in Slack and get the answer - or any other student can also answer.
Make sure your version is up to date. I would recommend 4.18 or 4.24 for Solidity.

All hands Agenda

Sep 7th 2018

Contents Materials will be shared via Zoom on video

Go over core company values
Go over summarized company timeline - deta
Quick (5 min) discussion on our transition to delaware corporation structure
Travel schedules for conference (google forms for everyone to fill out)
Client updates

Keybase proof

I hereby claim:

I am lingqingmeng on github.
I am decentralinc (https://keybase.io/decentralinc) on keybase.
I have a public key ASAincL5wyqwbFMOl3v957tQmkFU1DoJS62JwCjpZw7dfQo

To claim this, I am signing this object:

NYC BLOCKCHAIN CENTER WORKSHOP

Workshop files used for Blockchain Developer Seminar: Applied Rust for Protocol Development

We will send out finished projects after each tutorial. Code demonstration will be given live. If you prefer following along more than welcome to. We will release a video and a finalized codebase later this week.

Overview

To run this project, make sure we have the latest rustc version, which is the official compiler for Rust.

Keybase Cryptography

This is a construction for encrypting and signing a message, using a symmetric encryption key and a signing keypair, in a way that supports safe streaming decryption. We need this for chat attachments because we've chosen to use signing keys for authenticity in chat, and we don't want one participant to be able to modify another's attachment, even with an evil server's help. It's almost enough that we record the hash of the attachment along with the symmetric key used to encrypt it, but that by

	```
	pragma solidity ^0.4.18;

	/**
	3500,12000,6,18504502,49504020,400

	*/

	/**
	* @title Ownable

	pragma solidity ^0.4.13;

	library SafeMath {

	/**
	* @dev Multiplies two numbers, throws on overflow.
	*/
	function mul(uint256 a, uint256 b) internal pure returns (uint256) {
	if (a == 0) {
	return 0;

	pragma solidity ^0.4.18;



	/*
	Utilities & Common Modifiers
	*/
	contract Utils {

	// verifies that an amount is greater than zero

	pragma solidity ^0.4.18;

	/*
	ERC20 Standard Token interface
	*/
	contract IERC20Token {
	// these functions aren't abstract since the compiler emits automatically generated getter functions as external
	function name() public view returns (string) {}
	function symbol() public view returns (string) {}
	function decimals() public view returns (uint8) {}

	pragma solidity ^0.4.18;

	/*
	ERC20 Standard Token interface
	*/
	contract IERC20Token {
	// these functions aren't abstract since the compiler emits automatically generated getter functions as external
	function name() public view returns (string) {}
	function symbol() public view returns (string) {}
	function decimals() public view returns (uint8) {}