Dean Eigenmann decanus

Writing an EVM-debugger for Geth

This document provides some ideas on how someone fairly easily could build the basic blocks for a debugger using geth.

Integration

The tracer interface defines four methods that a 'tracer' needs to implement:

Answers to Deep Questions about Solidity

The following list of questions was taken from https://www.reddit.com/r/ethereum/comments/72reba/do_you_have_deep_questions_about_solidity_or_the/

An updated summary on the different ways one could have two contracts interact (DELEGATECALL, STATICCALL, libraries, all that stuff) with clear pros/cons for each (gas cost, whether it requires EVM assembly directives, etc)

Question by /u/drcode

I won't talk about low-level opcodes here because of the brevity of the answer. In general, there are four ways functions can be called in Solidity:

Explanation of how using Schnorr signatures, we can achieve an atomic swap of the "scriptless script" style.

This is based on Poelstra's ideas as summarised in https://download.wpsoftware.net/bitcoin/wizardry/mw-slides/2017-05-milan-meetup/slides.pdf ; also see the earlier outline in https://lists.launchpad.net/mimblewimble/msg00086.html.

Note that the details here are just my thoughts, so if you come to this randomly, don't take it as some kind of well established protocol!

Preliminaries:

We'll use || for concatenation and capitals for elliptic curve points and lower case letters for scalars.

Twelve Go Best Practices

Francesc Campoy Flores Gopher at Google @francesc http://campoy.cat/+

http://golang.org

Best practices

Push branch from one remote into another

Add remote2 as a remote

$ git remote -v
remote2 [email protected]:repo2.git (fetch)
remote2 [email protected]:repo2.git (push)
origin  [email protected]:repo.git (fetch)
origin  [email protected]:repo.git (push)

	contract AccountProxy {
	event Fwded(address indexed to, uint256 value, bytes calldata, bool succeeded);

	// must be implemented by super contract
	function canFwd(address who, address to, uint256 value, bytes calldata) public view returns (bool);

	function () payable {} // allow to deposit eth

	function fwd(address to, uint256 value, bytes calldata) external {
	require(canFwd(msg.sender, to, value, calldata));

	package main

	import (
	"fmt"
	"log"
	"strconv"

	"github.com/miekg/dns"
	)

	// Created by Chris Eidhof on 04-01-16.
	// Copyright © 2016 Chris Eidhof. All rights reserved.
	//
	// Large parts copy/pasted from https://github.com/Eonil/TCPIPSocket.Swift

	import Foundation

	struct TCPIPSocketAddress {
	init(_ a:UInt8, _ b:UInt8, _ c:UInt8, _ d:UInt8) {
	let a1 = UInt32(a) << 24