infredulous

Bitcoin user-friendly identity, the paymail protocol and beyond!

The article spans across multiple areas, the agenda outline is below:

Philosophical underpinnings of online identity. High level view of the evolution of digital identity centralized → federated → self-sovereign (user autonomy).
A critique of the paymail protocol, its strengths and limitations
Establish the need for a new naming protocol suite with a fundamental focus on user autonomy.
An attempt to present dispassionate arguments without social bias

block height	subsidy era	subsidy (sats)	total supply (sats)
210000	1	5000000000	1050000000000000
420000	2	2500000000	1575000000000000
630000	3	1250000000	1837500000000000
840000	4	625000000	1968750000000000
1050000	5	312500000	2034375000000000
1260000	6	156250000	2067187500000000
1470000	7	78125000	2083593750000000
1680000	8	39062500	2091796875000000

Using PGP signatures with bitcoin script OP_CHECKDATASIG

Dr. Mark B. Lundeberg, 2018 August 30 bitcoincash:qqy9myvyt7qffgye5a2mn2vn8ry95qm6asy40ptgx2

Since version 2.1, GnuPG is able to use the very same secp256k1 elliptic curve signature algorithm (ECDSA) as used in bitcoin. Quite soon Bitcoin Cash will add a new script opcode OP_CHECKDATASIG that is able to check signatures not just on the containing transaction, but also on arbitrary data. For fun, let's try to intersect the two signature systems and see what can be done!

	# location to store blockchain and other data.
	datadir=/home/satchmo/.bitcoin
	dbcache=4000

	usecashaddr=0

	# Must set txindex=1 so Bitcoin keeps the full index
	txindex=1

	# [rpc]

	<!doctype html>
	<html lang="en">
	<head>
	<!-- Required meta tags -->
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

	<!-- Bootstrap CSS -->
	<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymo
	us">

	// ==UserScript==
	// @name Reddit Hide Promoted Links (New Design)
	// @namespace http://github.com/rohenaz
	// @version 0.1
	// @description remove promoted posts and advertisements
	// @author Satchmo
	// @match https://www.reddit.com/*
	// @grant none
	// ==/UserScript==

	This document is an attempt to define metrics quantifying the degree of privacy provided by a bitcoin transaction.


	Objectives

	Definition of metrics measuring the resistance of a transaction to a set of attacks against users privacy.

	Attacks considered in the scope of these metrics are:
	- Merged Inputs Heuristic: methods identifying the inputs controlled by a same entity
	- Coinjoin Sudoku: methods identifying the links existing between the inputs and outputs of a transaction

	// Retrieved during authentication:
	String authToken = ...
	String noteStoreUrl = ...

	String userAgent = myCompanyName + " " + myAppName + "/" + myAppVersion;

	THttpClient noteStoreTrans = new THttpClient(noteStoreUrl);
	userStoreTrans.setCustomHeader("User-Agent", userAgent);
	TBinaryProtocol noteStoreProt = new TBinaryProtocol(noteStoreTrans);
	NoteStore.Client noteStore = new NoteStore.Client(noteStoreProt, noteStoreProt);

infredulous

Bitcoin user-friendly identity, the paymail protocol and beyond!

Using PGP signatures with bitcoin script OP_CHECKDATASIG

Background

OP_CHECKDATASIG signatures