| // ==UserScript== | |
| // @name Peepeth Enhancer | |
| // @namespace https://github.com/jordanmack/PeepethEnhancer | |
| // @version 0.3.0 | |
| // @description Peepeth Enhancer is a collection of scripts that add several new features to Peepeth. | |
| // @author Jordan Mack (jordanmack.info) | |
| // @match https://peepeth.com/* | |
| // @grant none | |
| // ==/UserScript== |
| javascript:(function()%7Bconst%20reveal%20%3D%20function()%7BjQuery(%22a.nsfwShow%22).click()%3BjQuery(%22a.politicsShow%22).click()%3B%7D%3Breveal()%3BsetInterval(reveal%2C%20500)%7D)() |
| import cProfile | |
| import os | |
| import pstats | |
| import random | |
| import rlp | |
| from eth.db.trie import make_trie_root_and_nodes | |
| from eth.vm.forks.frontier.transactions import FrontierTransaction |
| --- trim --- | |
| https://peepeth.com/about | |
| https://www.kickstarter.com/projects/1414168019/peepeth-social-network-for-a-better-world | |
| Peepeth's data is open to anyone. The contract is stateless, except for recording unique usernames, so you have to query each block and parse the input data of each transaction according to the following ABI. | |
| For more about stateless contracts, check out this great post. | |
| https://medium.com/@childsmaidment/stateless-smart-contracts-21830b0cd1b6 |
| #[derive(Debug)] | |
| struct Consumption { | |
| used: usize, | |
| refund: usize, | |
| } | |
| impl Consumption { | |
| pub fn absolute(&self) -> isize { | |
| self.used as isize - self.refund as isize | |
| } |
| package main | |
| import ( | |
| "context" | |
| "github.com/ethereum/go-ethereum/common" | |
| "github.com/ethereum/go-ethereum/ethclient" | |
| ) | |
| var server = "http://localhost:8545" | |
| var blockHash = "0xac8e95f7483f7131261bcc0a70873f8236c27444c940defc677f74f281220193" |
Suppose we wish to model a UTXO system on the EVM. We need to represent UTXO tokens such that all value is preserved when tokens are spent. Note: For this example, we are not concerned about the security of the system and are satisfied with giving authorities the power to create tokens (e.g. as in a plasma system).
Consider the following object:
{
owner: <address>,
value: <uint>,
| layout | title | date |
|---|---|---|
post |
contract creation golf |
2018-02-22 17:33 |
Fun little learning exercise, what's the shortest bytecode you can send that will publish a contract with non-zero bytecode? The response to getCode() should have some characters that aren’t either 0 or x.
To test it out:
| /*** | |
| * Shoutouts: | |
| * | |
| * Bytecode origin https://www.reddit.com/r/ethereum/comments/6ic49q/any_assembly_programmers_willing_to_write_a/dj5ceuw/ | |
| * Modified version of Vitalik's https://www.reddit.com/r/ethereum/comments/6c1jui/delegatecall_forwarders_how_to_save_5098_on/ | |
| * Credits to Jorge Izquierdo (@izqui) for coming up with this design here: https://gist.github.com/izqui/7f904443e6d19c1ab52ec7f5ad46b3a8 | |
| * Credits to Stefan George (@Georgi87) for inspiration for many of the improvements from Gnosis Safe: https://github.com/gnosis/gnosis-safe-contracts | |
| * | |
| * This version has many improvements over the original @izqui's library like using REVERT instead of THROWing on failed calls. | |
| * It also implements the awesome design pattern for initializing code as seen in Gnosis Safe Factory: https://github.com/gnosis/gnosis-safe-contracts/blob/master/contracts/ProxyFactory.sol |
Dr. Mark B Lundeberg, 2018 Feb 15
bitcoincash:qqy9myvyt7qffgye5a2mn2vn8ry95qm6asy40ptgx2
This security advisory notes a vulnerability in the common construction of cross-chain smart contracts (contracts between distinct cryptocurrencies) through hash locking. I focus on the primary use case in [atomic