kristapsk

Protocol for Zero-Confirmation Bitcoin Payments

Overview

This protocol lets a Bitcoin user make zero-confirmation payments while retaining a trustless unilateral exit path if the co-signing server disappears or refuses to cooperate.

• The user keeps funds in a confirmed 2-of-2 multisig with a co-signing server.
• The co-signer enforces a policy of not signing conflicting spends.
• Recipients can accept zero-confirmation payments if they trust the co-signer's policy.
• The user receives a pre-signed unilateral exit transaction before depositing funds.

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Void Linux installation on Hetzner Cloud VPS

(Arm64/IPv6-only)

This guide describes how to install Void Linux on ARM Hetzner Cloud instances with IPv6-only setup.

Table of contents:

• Installation

kristapsk

#!/usr/bin/env python3
# accesslog2csv: Convert default, unified access log from Apache, Nginx
# servers to CSV format.
#
# Original source by Maja Kraljic, July 18, 2017
# Modified by Joshua Wright to parse all elements in the HTTP request as
# different columns, December 16, 2019
# Modified by Kristaps Kaupe to support (ignore) additional fields at the end and also added shebang at March 2023

kristapsk

#!/usr/bin/env bash

lockdir=/tmp/satsale.lock
if mkdir "$lockdir" 2> /dev/null ; then
    trap 'rm -rf "$lockdir"' 0
    trap "exit 2" 1 2 3 15
else
    exit 0
fi

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Utxos are grouped by address type (P2PKH, P2SH-P2WPKH, or P2WPKH).

The group with the same address type as the address being spent to is selected if it is >= twice the spend amount.
If the above condition is not met, then a group with a different address type and a total value >= twice the spend amount is selected.
If the above condition is not met, then 2 groups with total amounts >= the spend amount are chosen.

Transaction composition is arranged by “sets”.

For each set:
The utxos are processed in randomised order.

kristapsk

#!/usr/bin/env bash

while :; do
    lightning-cli listpeers | jq -r ".peers[].id" | while read node_id; do
        if [[ $((RANDOM % 2)) != 0 ]]; then
            echo "Pinging $node_id"
            lightning-cli ping $node_id $((RANDOM % 65530)) $((RANDOM % 65530))
        fi
    done
    echo "[$(date -u +"%Y-%m-%dT%H:%M:%SZ")] sleeping..."

kristapsk

Odroid HC4 RaspiBolt installation notes

Upgrading

Upgrading kernel will make it unbootable.

# apt update
# apt-mark hold linux-odroid-c4
linux-odroid-c4 set on hold.

kristapsk

Keybase proof

I hereby claim:

• I am kristapsk on github.
• I am kristapsk (https://keybase.io/kristapsk) on keybase.
• I have a public key ASBHmqoD_9bKZ-aOHjBP4NPx_q1EtPBCbxvBWUmDSK-9sgo

To claim this, I am signing this object:

kristapsk

<?php
$algo = 'sha512';
$algo_iter = 100;
$rand = ord(openssl_random_pseudo_bytes(1));
$pass = 'password';
$salt = openssl_random_pseudo_bytes(16);
$salt_hex = bin2hex($salt);
$finished = false;
$val = hash($algo, hash($algo, $pass) . $salt);
for ($i = 0; $i <= 255; $i++) {

kristapsk

diff --git a/hphp/runtime/server/http-request-handler.cpp b/hphp/runtime/server/http-request-handler.cpp
index 4b5c3f4..8369e8e 100644
--- a/hphp/runtime/server/http-request-handler.cpp
+++ b/hphp/runtime/server/http-request-handler.cpp
@@ -180,8 +180,7 @@ void HttpRequestHandler::handleRequest(Transport *transport) {
     }
   }
 
-  ServerStats::StartRequest(transport->getCommand().c_str(),
-                            transport->getRemoteHost(),