Johnny Santos johnnyasantoss

SwiftSync

Near-stateless, fully parallelizable validation of the Bitcoin blockchain with hints about which outputs remain unspent. All other inputs/outputs are efficiently crossed off inside a single hash aggregate that only reaches zero if validation was successful and the hints were correct.

15-minute talk summarizing the protocol

Introduction

Validation is at the heart of Bitcoin. Any improvements in validation speed will have a direct impact on the scalability of the system, including everything that is built on top of it. For this reason improving validation performance may be one of the most important things we can do.

Messaging Changes

I am assuming minimal changes to commitment transaction structure, essentially swapping out HTLC for PTLC, so no fast-forward schemes here.

Here are output labels because I get confused so often what things in BOLTs mean:

(a) a_o_atx_* Alice-offered "offered PTLC" in Alice's tx
(b) a_o_btx_* Alice-offered "received PTLC" in Bob's tx
(c) b_o_atx_* Bob-offered "received PTLC" in Alice's tx
(d) b_o_btx_* Bob-offered "offered PTLC" in Bob's tx

A Proof of Liabilities Scheme for Ecash Mints

Abstract: In this document, I will outline a proof-of-liabilities (PoL) scheme for ecash systems and Cashu specifically, which is a Chaumian ecash system for Bitcoin. The PoL scheme consists of three parts. First, a publicly auditable list of all issued ecash tokens in the form of mint proofs, and second, a publicly auditable list of all redeemed ecash tokens in the form of burn proofs, which are both regularly published by the mint operator. Third, a mint publicly commits to rotate its keys regularly once each epoch and allows all ecash in circulation to recycle from old epochs to the newest one. If clients remain vigilant and mints agree on a certain set of rules of operation which are publicly verifiable, users of a mint can detect whether a cheating mint has printed unbacked ecash during a past epoch, and, in many cases, provide public proofs of the mint engaging in this adversary behavior. Users achieve this by regularly checking t

Covenants

Covenant-enabling Bitcoin Features

BIP119: CHECKTEMPLATEVERIFY (CTV) by Jeremy Rubin
BIP118: SIGHASH_ANYPREVOUT (APO) (aka SIGHASH_NOINPUT) by Christian Decker and Anthony Towns
OP_CAT by Andrew Poelstra
OP_CHECKSIGFROMSTACK (CSFS) + OP_CAT
OP_TAPLEAF_UPDATE_VERIFY (TLUV) by Anthony Towns
TXHASH + CHECKSIGFROMSTACKVERIFY (TXHASH + CSFS) by Russel O'Connor
OP_EVICT by ZmnSCPxj

How to remove dotnet from MacOs

https://github.com/dotnet/cli/blob/rel/1.0.0/scripts/obtain/uninstall/dotnet-uninstall-pkgs.sh

https://stackoverflow.com/a/44089766

To uninstall dotnet core from macOS:

download dotnet-uninstall-pkgs.sh from https://github.com/dotnet/sdk/blob/main/scripts/obtain/uninstall/dotnet-uninstall-pkgs.sh
make dotnet-uninstall-pkgs.sh executable

How To Set Up a Raspberry Pi 4 with Archlinux 64-bit (AArch64) and Full Disk Encryption (+SSH unlock), USB Boot (No SD-Card) and btrfs

Written by: XSystem
First published on: 20 Dec 2020
Last updated on: 20 Dec 2020

[0] Introduction

Overview

Creating an AUR Package

Maintainer: Keil Miller Jr

How to create and manage an AUR package.

The following link should be read:

	#!/usr/bin/env python3
	# Distributed under the MIT software license
	import binascii, struct, sys, io, argparse
	from PIL import Image

	IMG_WIDTH = 512 # could be made adaptive...
	MIN_HEIGHT = 4 # minimum height of image; twitter won't let us upload anything smaller
	BYTES_PER_PIXEL = 4 # RGBA, 8 bit

	def div_roundup(x,y):

	# Today the twitter user @ayubio said he had received the private key for a Brazillian bank's HTTPS certificate:
	# - https://twitter.com/ayubio/status/994260981294469120
	# - https://twitter.com/ayubio/status/994262029929246722
	# - https://twitter.com/ayubio/status/994277992351391744
	# To prove he actualy had the key, another user asked him to sign a message with such key and so he did:
	# - http://pastebin.xyz/p?q=bXllODA

	# The commands bellow will check that signature

	# Store the message in a file (tweet.txt) in the same way @ayubio did:

	import certstream

	keywords = ['paypal', 'paypol']

	def extract_domains(domains):
	res = []
	for domain in domains:
	for keyword in keywords:
	if keyword in domain:
	res.append(domain)