Martian immartian

Silent Payments

Receive private payments from anyone on a single static address without requiring any interaction or extra on-chain overhead.

Update: This now has a BIP and WIP implementation

Overview

The recipient generates a so-called silent payment address and makes it publicly known. The sender then takes a public key from one of their chosen inputs for the payment, and uses it to derive a shared secret that is then used to tweak the silent payment address. The recipient detects the payment by scanning every transaction in the blockchain.

Let's Encrypt

Examples of getting certificates from Let's Encrypt working on Apache, NGINX and Node.js servers.

Obtain certificates

I chose to use the manual method, you have to make a file available to verify you own the domain. Follow the commands from running

git clone https://github.com/letsencrypt/letsencrypt
cd letsencrypt

Create a new repository, or reuse an existing one.

Generate a new SSH key:

ssh-keygen -t rsa -C "[email protected]"

Copy the contents of the file ~/.ssh/id_rsa.pub to your SSH keys in your GitHub account settings (https://github.com/settings/keys).

Test SSH key:

Install msmtp, a simple sendmail stand-in that sends mail via a relay host (which is what you want, in almost all cases):
```
 brew install msmtp --with-macosx-keyring
```
The flag with-macosx-keyring will make msmtp use the MacOS keychain, which is a pretty secure way to keep your mail account password secure.
Configure it as described in this article. Don't use the manual installation method described there, Homebrew (which we used in step 1) is way more convenient.
Have mail use msmtp instead of sendmail by creating .mailrc with the following content (or adding it, it the file already exists):

	#!/bin/bash

	GIT_VERSION="2.23.0"

	yum install -y gcc wget make curl-devel expat-devel \
	gettext-devel openssl-devel perl-devel zlib-devel

	cd ~
	if [ ! -f git-${GIT_VERSION}.tar.gz ]; then
	wget https://mirrors.edge.kernel.org/pub/software/scm/git/git-${GIT_VERSION}.tar.gz

	const functions = require('firebase-functions');
	const admin = require('firebase-admin');
	const request = require('request');

	admin.initializeApp(functions.config().firebase);

	exports.saleAlert = functions.https.onRequest((req, res) => {
	const product = req.body.event.data.checkout.id;
	const id = req.body.event.data.code;

	# Guitar Strumming - by Emlyn
	# This tries to work out the guitar (or ukulele etc.) fingering for arbitrary chords (and tuning).
	# It seems to work reasonably well for basic chords, but is quite naive and probably makes many mistakes.
	# Ideas, bug reports, fixes etc. gratefully received, just comment below, or tweet @emlyn77.
	# Feel free to make use of this code as you like (with attribution if you feel like it, but you don't have to).
	# Thanks to @Project_Hell_CK for fixing the tuning, and spotting that it gets chord(:f, :major) not quite right.

	# Next note higher or equal to base note n, that is in the chord c
	define :next_note do \|n, c\|
	# Make sure n is a number

	ipfs config Addresses.Gateway /ip4/0.0.0.0/tcp/9001
	ipfs config Addresses.API /ip4/0.0.0.0/tcp/5001