emre etherx-dev

Hal Finney's explanation of secp256k1 "efficiently computable endomorphism" parameters used secp256k1 libraries, archived from source.

The same optimization could be applied to any Koblitz curve (e.g. Short Weistrass curve with a=0).

I implemented an optimized ECDSA verify for the secp256k1 curve, based on pages 125-129 of the Guide to Elliptic Curve Cryptography, by Hankerson, Menezes and Vanstone. I own the book but I also found a PDF on a Russian site which is more convenient.

secp256k1 uses the following prime for its x and y coordinates:

DOGECOIN FEE POLICY CHANGE PROPOSAL

This document proposes a new fee structure and policy for Dogecoin Core, to be gradually deployed to the network over multiple software releases.

Historical fee policy

Meaningful fees were introduced for Dogecoin in 2014 to reduce on-chain spam. With a 1 DOGE fee per kilobyte, rounded up, the Dogecoin chain provided

Introduction

It would be spiffy to use the balanced merkle forest idea for ethereum tokens or to store unspent transaction outputs.

Tadge Dryja has been working on 'utreexo' (presentation) for storing unspent transaction outputs in log(n) space; this gist is inspired by, and is very similar to, that work.

So my previous gist describes really simple algorithms for adding and removing items from a balanced merkle forest. This gist extends those operations to create

20 million digits of pi in under a minute with Julia

I recently discovered a relatively obscure algorithm for calculating the digits of pi: https://en.wikipedia.org/wiki/Gauss–Legendre_algorithm. Well, at least obscure compared to Chudnovsky's. Wikipedia notes that it is "memory-intensive" but is it really? Let's compare to the MPFR pi function:

function gauss_legendre(prec)
    setprecision(BigFloat, prec, base=10)
    GC.enable(false)

	#include <windows.h>
	#include <stdio.h>
	#include <stdint.h>

	#pragma comment(lib, "USER32")

	FARPROC NtUserPostMessage;

	BOOL CALLBACK QueryWindowMessageProc(HWND Window, LPARAM Param)
	{

	# https://www.cloudflare.com/ips
	# https://support.cloudflare.com/hc/en-us/articles/200169166-How-do-I-whitelist-CloudFlare-s-IP-addresses-in-iptables-

	for i in `curl https://www.cloudflare.com/ips-v4`; do iptables -I INPUT -p tcp -m multiport --dports http,https -s $i -j ACCEPT; done
	for i in `curl https://www.cloudflare.com/ips-v6`; do ip6tables -I INPUT -p tcp -m multiport --dports http,https -s $i -j ACCEPT; done

	from binance.client import Client
	from binance.exceptions import BinanceAPIException, BinanceRequestException
	#incomplete but i just need a useful regex
	client = Client("apikey", "secret")

	coininfo = client.get_all_coins_info()
	for coin in coininfo:
	for network in (coin['networkList']):
	print(coin['name'],network['addressRegex'])