rumkin

This is an example of receiveing ethereum address from a secp256k1 private key.

Source: witnet/elliptic-curve-solidity#14 (comment)

rumkin

// Usage is node exec.js app.js
// app.js should export default function
import path from 'path'

async function execute(filename) {
  const {default: main} = await import(
    path.resolve(filename)
  )

  return main({

rumkin

LibP2P Stream end

Here is the complete example of LibP2P streams write and read client and server.

Utils

This code uses some utils. Like peer generation and ESM module apps runner. You can see it in uitls gist:

https://gist.github.com/rumkin/51bc6a346b40e6a303d1e1eba1f38199

rumkin

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100">
  <text y="100" font-size="100">
    😎
  </text>
</svg>

rumkin

function * range(start, end, step = 1) {
  if (start < end) {
    while (start < end) {
      yield start
      start += step
    }
  }
  else if (start > end) {
    while (start > end) {
      start -= step

rumkin

--- new.patch	2020-03-02 14:15:28.000000000 +0300
+++ old.patch	2020-03-02 14:16:08.000000000 +0300
@@ -1,17 +1,17 @@
-From 00bb40d8982cd986a37a8072691060a8b72ce11d Mon Sep 17 00:00:00 2001
+From 054bc49da2332948df9e015d7353a94d3c162d52 Mon Sep 17 00:00:00 2001
 From: Pavel Rumkin <dev@rumk.in>
 Date: Sat, 22 Feb 2020 09:31:44 +0300
 Subject: [PATCH 1/2] Add initialization method to prevent race conditions
 
 ---

rumkin

Run EVM tests with TestUp

This is short explanation of how tests scripts and helpers might look.

evm.spec.js

import {initEvm, checkpoint} from './helpers';

export default ({describe, it, use, each}) => {

rumkin

find-to-tar() {
  local IN=${1:-.}
  local OUT=${2:-archive.tar.gz}

  find $IN -type f ! \( -path '*/node_modules/*' -o -path '*/dist/*' -o -path '*/build/*' \) | tar cvfz $OUT -T -
}

# Example:
# $ find-to-tar . arch.tar.gz

rumkin

pragma solidity ^0.5.0;

contract Registry {
    bytes[] names;
    mapping(bytes32 => Package) packages;

    struct Package {
        bytes name;
        address owner;
        uint8[] versions;

rumkin

pragma solidity >= 0.5.0;

contract Log {
    address public owner;
    
    event LogMsg(bytes message);
    
    constructor(address _owner) public {
        owner = _owner;    
    }