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#! /bin/bash

# get latest alpine linux AMI
aws ec2 describe-images --output text --filters Name=owner-id,Values=538276064493 Name=name,Values='alpine-ami-3.13*-x86_64*' Name=architecture,Values=x86_64 Name=state,Values=available --query 'max_by(Images[], &CreationDate).ImageId'

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Go install using gvm on fresh Ubuntu instance

Install

Using a fresh Ubuntu 18.04 (latest LTS) install:

# Install prerequisites
sudo apt update
sudo apt install -y bison binutils gcc make

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#! /bin/bash

# search based on prefix and most recent date
IMAGE_PREFIX="ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-"

# Canonical (makers of Ubuntu)
OWNER_ID="099720109477"

for REGION in $(aws ec2 describe-regions | jq -r '.Regions[].RegionName'); do
  IMAGE_ID=$(aws ec2 describe-images --region "${REGION}" --filters "Name=name,Values=${IMAGE_PREFIX}*" --owners "$OWNER_ID" | jq -r '.Images | sort_by(.CreationDate)[-1].ImageId')

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# ignore the ignore/ dir
ignore/

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test json schema validation

Setup Virtualenv

$ virtualenv ./venv
$ ./venv/bin/pip install -r requirements.txt

Test/Play:

$ ./venv/bin/python ./v.py

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package main

import (
	"fmt"
	"os"
	"regexp"
	"strings"
)

var reS3KeyPDFUpload = regexp.MustCompile(`^.*\/(?P<year>\d{4})\/(?P<month>\d{2})\/(?P<day>\d{2})\/.*\.pdf$`)

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; /usr/local/bin/nasm -f macho 32.asm && ld -macosx_version_min 10.7.0 -o 32 32.o && ./32

global start

section .text
start:
    push    dword msg.len
    push    dword msg
    push    dword 1
    mov     eax, 4

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package main

import (
	"fmt"
)

func dispByteSlice(slice []byte) {
	for i, b := range slice {
		if (i % 8) == 0 {
			fmt.Printf("\n")

nmarley

Example of "bitcoin-core" Node.js client usage

This is an example using Rui Marinho's "bitcoin-core" Bitcoin daemon JSONRPC and REST client library.

Install

npm ci

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var eu = require('ethereumjs-util')

var uncompressed_public_key_hex = '04320c6bb9c30cd4ee54484ad10b01d2742105a70b9333b2310be8e870344f18f23d70897cf0588510fc28cf76b637902179cc2d3ead649718bef61c6eb95cec7e'

var upk_buf = new Buffer(uncompressed_public_key_hex, 'hex')
var addr_buf = eu.pubToAddress(upk_buf.slice(1,65))

var addr = addr_buf.toString('hex')

console.log("addr: " + eu.toChecksumAddress(addr) )