ottosch / draw-tx.sh

Created May 3, 2025 22:28

Draws ASCII art from tx 5c4f060e6166a530d891cafd0e9df42441d29b1ed9cff71a1652201b8d50bd72

bitcoin-cli getrawtransaction 5c4f060e6166a530d891cafd0e9df42441d29b1ed9cff71a1652201b8d50bd72 2 | jq -r '.vout[].scriptPubKey.hex | sub("^.{6}"; "")' | while read -r output; do echo "$output" | xxd -p -r; echo; done

ottosch / dinner-inscription.js

Created May 3, 2025 21:50

Extract image inscription of tx 4be3a833ee83b4ca7d157d60fbf7411f7528314ce90df8a844f855118bc6ca11

	#! /usr/bin/env node

	// Invoke with: bitcoin-cli getrawtransaction 4be3a833ee83b4ca7d157d60fbf7411f7528314ce90df8a844f855118bc6ca11 \| ./dinner-inscription.js

	const { Transaction } = require('bitcoinjs-lib');

	if (process.stdin.isTTY) {
	console.error('raw tx needed, quitting...');
	process.exit(1);
	}

ottosch / restore-grub.md

Created February 25, 2025 02:02

How to restore GRUB using Arch Linux ISO

Partitions

/dev/sda1: ESP (EFI System Partition)
/dev/sda2: system + home
/dev/sda3: swap

Script

ottosch / verify-grapheneos-signature.md

Created February 10, 2025 23:16

How to verify GrapheneOS releases

Verifying GrapheneOS releases

Instructions taken from Obtaining Factory Images.

Get the signers' public keys

curl -O https://releases.grapheneos.org/allowed_signers

ottosch / twitter-revanced.md

Last active May 17, 2025 00:40

How to patch Twitter (X) with ReVanced

Benefits:

Hide ads;
Remove tracking when sharing links;
Enable video download;
Other benefits;

Download X apk

ottosch / laptop-lid.md

Last active January 13, 2025 21:57

Settings to avoid laptop sleeping after lid is closed

Laptop lid configuration

Ignore the lid being closed

sudo nano /etc/systemd/logind.conf, change these values to ignore:

HandleLidSwitch=ignore
HandleLidSwitchExternalPower=ignore
HandleLidSwitchDocked=ignore

ottosch / dimm.sh

Created January 9, 2025 13:52

Change screen brightness for the terminal

	#! /usr/bin/env bash

	# Sets brightness to parameter level [0, max_brightness]
	# Default: 10_000

	default=10000
	brightness=${1:-$default}
	max="$(cat /sys/class/backlight/*/max_brightness)"

	if test "$brightness" -eq "$brightness" 2>/dev/null; then # numeric value

ottosch / seed_picker.sh

Last active December 24, 2023 01:59

Find all possibilities for the last seed word

	#! /usr/bin/env bash

	function run() {
	read_wordlist

	local input
	printf "Enter seed words: "
	read -r input

	local seed_words=()

ottosch / augustana-college.js

Created December 14, 2023 13:56

Extracts JPEG from transaction 033d185d1a04c4bd6de9bb23985f8c15aa46234206ad29101c31f4b33f1a0e49

	#! /usr/bin/env node

	const { Transaction } = require("bitcoinjs-lib");
	const fs = require("fs");

	const inputFile = "txhex";
	const outputFile = "output.bin";

	let hex = fs.readFileSync(inputFile, "utf8");
	let tx = Transaction.fromHex(Buffer.from(hex, "hex"));

ottosch / apk-cert-fingerprint.sh

Last active February 23, 2025 22:13

Outputs apk's signing certificate hash

	# 1024-bit key
	keytool -printcert -jarfile apk_file 2>/dev/null \| grep SHA256 \| cut -f2- -d':' \| tr -cd '[[:xdigit:]]:'; echo

	# 4096-bit key
	apksigner verify -v --print-certs --min-sdk-version 24 apk_file \| grep "certificate SHA-256"

	# One-liner example for Signal
	test $(apksigner verify -v --print-certs --min-sdk-version 24 Signal-Android-website-prod-universal-release-7.33.2.apk \| grep -m1 "certificate SHA-256" \| cut -d':' -f2 \| tr -cd '[:xdigit:]') = $(echo -n "4B:E4:F6:CD:5B:E8:44:08:3E:90:02:79:DC:82:2A:F6:5A:54:7F:EC:C2:6A:BA:7F:F1:F5:20:3A:45:51:8C:D8" \| tr -cd '[:xdigit:]' \| tr '[:upper:]' '[:lower:]') && echo "passed" \|\| echo "failed"