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@pcaversaccio
pcaversaccio / StringEncodingReturnData.sol
Created December 16, 2022 16:04
A simple Solidity PoC contract to showcase how revert strings are ABI encoded.
// SPDX-License-Identifier: WTFPL
pragma solidity 0.8.17;
/**
* @dev A simple contract that reverts.
*/
contract Revert {
function revertWithoutReason() external pure {
// solhint-disable-next-line reason-string
revert();
@hrkrshnn
hrkrshnn / BribeContract.yul
Last active October 10, 2022 14:42
Run by `solc --strict-assembly --optimize --ir-optimized`. Context: https://twitter.com/NoahZinsmeister/status/1499845282598731782 Need to use Yul, since there is no `verbatim` in Solidity's inline assembly.
// UNTESTED!
object "BribeContract" {
code {
let size := datasize("BribeRuntime")
codecopy(0, dataoffset("BribeRuntime"), size)
return(0, size)
}
object "BribeRuntime" {
code {
// Bribe by sending ETH. To try and claim, send a tx without ETH. Assumes that a tx with
@hrkrshnn
hrkrshnn / generic.org
Last active April 21, 2024 01:51
Some generic writeup about common gas optimizations, etc.

Upgrade to at least 0.8.4

Using newer compiler versions and the optimizer gives gas optimizations and additional safety checks for free!

The advantages of versions 0.8.* over <0.8.0 are:

  • Safemath by default from 0.8.0 (can be more gas efficient than some library based safemath).
  • Low level inliner from 0.8.2, leads to cheaper runtime gas. Especially relevant when the contract has small functions. For
@mds1
mds1 / .ethrc.sh
Last active April 25, 2024 17:12
# Ethereum helper methods
# source this in your .bashrc or .zshrc file with `. ~/.ethrc`
# --- Solidity sandbox ---
# https://github.com/maurelian/solidity-sandbox
scratch() {
dir=$(pwd)
cd ~/Documents/projects/solidity-sandbox || exit
bash newTest.sh $1
cd "$dir" || exit
@zsfelfoldi
zsfelfoldi / 1559 tx pool.md
Last active November 26, 2022 16:27

EIP-1559 transaction pool design improvement proposal

Author: Zsolt Felfoldi (zsfelfoldi@ethereum.org)

New difficulties introduced by EIP-1559

Transaction pools currently order transactions based on a single metric (gasPrice), fetching the highest elements when constructing a new block and discarding the lowest elements when the pool is full. With EIP-1559 transaction ordering becomes more difficult because the effective miner reward (MIN(tx.tip, tx.feeCap-headBlock.baseFee)) depends on the latest block's base fee. A new EIP-1559 compatible pool design suggested by this proposal and implemented in this pull request orders transactions primarily based on feeCap in the eviction queue while the current efferctive reward is used for block construction. This is a good first approach because inclusion chance correlates with feeCap on the low end. The only potential danger is that `feeCap

@spalladino
spalladino / falsehoods-that-ethereum-programmers-believe.md
Last active March 8, 2024 14:34
Falsehoods that Ethereum programmers believe

Falsehoods that Ethereum programmers believe

I recently stumbled upon Falsehoods programmers believe about time zones, which got a good laugh out of me. It reminded me of other great lists of falsehoods, such as about names or time, and made me look for an equivalent for Ethereum. Having found none, here is my humble contribution to this set.

About Gas

Calling estimateGas will return the gas required by my transaction

Calling estimateGas will return the gas that your transaction would require if it were mined now. The current state of the chain may be very different to the state in which your tx will get mined. So when your tx i

@braydonf
braydonf / reading-blocks-bcoin.js
Last active February 6, 2019 01:43
Read bitcoin blocks from disk with bcoin
// original: https://gist.github.com/braydonf/e9572bb40c084691fa20
'use strict';
const path = require('path');
const {Block, Network} = require('bcoin');
const fs = require('bfile');
const bufio = require('bufio');
(async function() {
@pervognsen
pervognsen / multidimensional_array_views.md
Last active March 24, 2024 02:09

Multi-dimensional array views for systems programmers

As C programmers, most of us think of pointer arithmetic for multi-dimensional arrays in a nested way:

The address for a 1-dimensional array is base + x. The address for a 2-dimensional array is base + x + y*x_size for row-major layout and base + y + x*y_size for column-major layout. The address for a 3-dimensional array is base + x + (y + z*y_size)*x_size for row-column-major layout. And so on.

@markblundeberg
markblundeberg / P2I.md
Last active June 1, 2019 15:20
"Pay To Identity" — a proposed use of OP_CHECKDATASIG

"Pay To Identity" — a proposed use of OP_CHECKDATASIG

Dr. Mark B. Lundeberg, 2018 September 6 bitcoincash:qqy9myvyt7qffgye5a2mn2vn8ry95qm6asy40ptgx2

A mechanism where a Bitcoin Cash payment is made to a personally identifying string (real name, email address, social media handle, etc.) instead of directly to a cryptographic key. The payment can only be claimed by the recipient if they generate a public key and get it certified by an identity verifier. This certification signature is confirmed in script via the new opcode OP_CHECKDATASIG.

Characteristics:

  • Pay anyone, right now -- recipient doesn't need to have any cryptographic keys nor do they even need a phone/computer. (They only need these to claim the funds later.)
@jonasschnelli
jonasschnelli / BIPoverhaul.mediawiki
Last active November 14, 2022 13:22 





  BIP&#58; 324
  Layer&#58; Peer Services
  Title&#58; Version 2 Peer&#45;to&#45;Peer Message Transport Protocol
  Author&#58; Jonas Schnelli <dev@jonasschnelli.ch>
          Dhruv Mehta <dhruvkaran@pm.me>
  Status&#58; Draft
  Type&#58; Standards Track
  Created&#58; 2019&#45;03&#45;08
  License&#58; PD