A crypto option gives you the right — but not the obligation — to buy or sell a cryptocurrency at a fixed price before a set date. That last part matters. Unlike a futures contract, where both sides are locked in, an option lets you walk away if the trade goes against you. Your downside…
In the dynamic world of cryptocurrency trading, “futures” and “perpetuals” are two of the most popular instruments for speculators and hedgers. While often discussed together, they are distinct products with crucial differences. Both allow traders to bet on the future price of a cryptocurrency without actually owning it. [1][2] What are Crypto Futures? A crypto…
Proving ownership of a Bitcoin (BTC) address is a crucial aspect in various scenarios. The post Proof of Ownership for BTC Addresses introduced the proof for non-multisig addresses. This guide explores how to prove ownership for different multisig BTC address types, including algorithm specifications and step-by-step methods. What is a Multisig Address? A Bitcoin multisig…
As a dedicated macOS user, I often find myself missing the convenience of having a Command key located near my thumb for common shortcuts when using Windows. In the standard Windows keyboard layout, the key that occupies the same position as the Command key on macOS is the Alt key. However, the equivalent key on…
If you often find yourself accidentally triggering the emoji picker in Linux by CTRL + Period (CTRL + .), you may want to disable the hotkey that brings it up. In this post, we will show you how to disable the emoji hotkey using the gsettings command. The emoji picker in Linux is typically activated…
In this post, we will explore a flexible utility function for splitting a string based on a given delimiter using C++ and the standard library. This allows us to break down complex strings into smaller parts that are easier to process and manipulate. The C++ Utility Function to Split a String by Another String Background:…
Zlib is a widely-used open-source compression library that implements the DEFLATE algorithm. It underpins gzip, PNG images, HTTP compression, and many other formats. Ubuntu provides zlib through its official repositories, making installation straightforward with apt. This guide covers installing zlib on Ubuntu 24.04 LTS (Noble) and Ubuntu 22.04 LTS (Jammy). If you need a version…
ECDSA keys are commonly used in various areas like blockchains. OpenSSL is a commonly used tools in Linux for handling signature/encryption/decryption. This post introduces how to generate ECDSA keys using OpenSSL in Linux. Generate keys for K1 secp256k1 elliptic curve We start with K1 (secp256k1) as the example. To generae ECDSA keys using other curves,…
We may use two lists to store the values of two properties of a list of elements in Python. Under such data structure arrangement, when we need to sort the properties from one list, we may want to also make sure the other list will be also re-ordered following the same order as the first…
snap is a software app bundle with dependencies included so that it can works in different Linux distributions. However, as most other software, snap has compatiblity issues. An app in the snap format is not 100% the same and compatible with the native version. One of the problem I find is that Thunderbird from snap…
For document, we may use the first page as the title page. Then the page number 1 should start from the second page. In this post, we will look at how to make MS Word count the page number from the second page. That is, making word treat the second page as page number 1….
R is good at analyzing data. Many data are provided as JSON from RESTful APIs with an URL. R natively support many data format. For JSON, we can use some libraries. For reading JSON from URL, we can use the “jsonlite” package. In this example, we use an example of fetching BTC prices of last…
Many useful data are stored in Excel xls or xlsx format files. R is good at doing analysis on top of data. We would then need to import the data to R by reading the xls/xlsx files to be R data frames. In this post, we check how to import data from Excel files to…
The Open Document .odt files can contain rich formats for the content. However, some times a plain text file is more handy. We may convert .odt files to plain text files for such needs. In this post, we discuss 3 ways of how to convert .odt files to .text files in command line in Linux….
Eclipse can work well with Git. We discussed Configuring Eclipse to Highlight Changed Lines Compared to Git Commit before. Eclipse can also show the revision information for lines of code (from git blame) which is useful to understand why some lines are added in the context of previous revisions including the lines of code. Eclipse…
For heavy Terminal/Shell/command line users, the Control key is a very frequently used key. However, in Mac Pro keyboard, there is only a single left Control key for some models. This cause quite some inconvenience. In this post, we will go through how to configure/remap the keys to “create” a right Control key. Remap keys…
Strings are commonly encoded as hexadecimal (hex) strings for various purposes. Hence, it is also common to convert hex strings to its original strings such as an ASCII string. Hex to ASCII string conversion can be done programmatically in many languages. In command line, we can use xxd to convert hex to ASCII string. This…
This is the release notes for linux release v2.0 (source code: linux-2.0.tar.gz) with format adjusted by removing/replacing tabs/spaces/new lines/formatting marks. This notes document can give us an understanding of the early development of the Linux kernel. The original ASCII formatted version is at the end of this post. Intro This document contains a list of…
Eclipse is one of the good IDEs for C/C++ projects with its great source code indexer. It is common the source code version is controlled by some tools like Git for software projects. It is convenient if the IDE can show the current changes compared to the committed code version. In this post, we will…
How to generate a pair of RSA private and public key in Go lang? Go lang has a rich set of standard libraries. Using Go’s standard libraries, we can generate RSA private and Public keys. The Crypto standard libraries in Go lang Go lang standard libraries has a rich set of cryptography functions. Here are…