A 51% attack happens when an entity or coalition controls more than 50% of a blockchain network’s total hash rate (in Proof-of-Work systems) or stake (in Proof-of-Stake systems). With this majority control, the attacker can: Reverse recent transactions — spend coins, then revert the transaction to regain them Block legitimate transactions — prevent certain addresses…
Proof of Work is the consensus mechanism that secures Bitcoin and a handful of other major blockchain networks. Introduced by Satoshi Nakamoto in 2009, it requires network participants (miners) to solve computationally expensive cryptographic puzzles. The first miner to solve the puzzle earns the right to add the next block of transactions and receives a…
Proof of Stake is a consensus mechanism that secures blockchain networks by having validators lock up cryptocurrency as collateral. Instead of the energy-intensive mining required by Proof of Work, PoS creates economic incentives: validators earn rewards for honest participation, and lose staked funds if they misbehave or go offline. This “slashing” mechanism makes attacking the…
Uniswap is the largest Decentralized Exchange (DEX) in crypto, built on a fundamentally different model than traditional trading venues. Instead of maintaining an order book where buyers and sellers match trades, it uses an Automated Market Maker (AMM) — a smart contract that determines prices algorithmically based on liquidity pools. The Liquidity Pool Model Rather…
Ethereum is a decentralized, open-source blockchain platform enabling developers to build and deploy smart contracts and decentralized applications (dApps). Launched in 2015 by Vitalik Buterin, it functions as a global computational network—code executes exactly as programmed without downtime, censorship, or third-party interference. Key Milestones 2013: Vitalik Buterin publishes the Ethereum Whitepaper 2014: Public crowdsale raises…
CalDAV and CardDAV are open, internet-based standards for syncing calendar and contact data across different devices and services. They’re built on WebDAV and the iCalendar/vCard formats, making them vendor-agnostic and suitable for both personal deployments and enterprise environments. What CalDAV Does CalDAV handles calendar synchronization—events, tasks, reminders, and availability data. Add an event on your…
Decentralization is the transfer of control and decision-making from a centralized entity—typically a company, government, or institution—to a distributed network of participants. In practice, this means no single actor can unilaterally control the system, change its rules, or shut it down. The Three Dimensions of Decentralization When evaluating whether a system is actually decentralized, consider…
A cryptographic token is a digital asset issued on top of an existing blockchain. While Bitcoin is the native coin of its own chain, tokens like USDC or Chainlink (LINK) typically run on other chains such as Ethereum or Solana. Tokens are created through smart contracts and represent value, ownership, or access rights—all verifiable and…
A Non-Fungible Token (NFT) is a unique digital certificate stored on a blockchain. Unlike cryptocurrencies like Bitcoin (which are “fungible,” meaning one Bitcoin is identical to another), every NFT has a unique identifier that distinguishes it from all others. Think of it like a signed baseball card or a deed to a house. You can…
A cryptographic hash function is a mathematical algorithm that takes any input—a file, password, transaction, or string of any length—and produces a fixed-length output called a “hash” or “digest.” The output is always the same size regardless of input size. SHA-256, for example, always produces a 256-bit (64 hexadecimal character) output. Core Properties Deterministic The…
A cryptocurrency is a digital currency secured by cryptography and typically built on blockchain technology. Unlike traditional fiat money issued by central banks, most cryptocurrencies operate on decentralized networks where transactions can occur directly between peers without intermediaries like banks. Key Asset Categories in 2026 Store of Value & Currency Bitcoin (BTC) remains the dominant…
Bitcoin is the world’s first decentralized cryptocurrency. Launched in 2009 by the pseudonymous Satoshi Nakamoto, it functions as a peer-to-peer electronic cash system that operates without banks or intermediaries. Anyone with an internet connection can send value anywhere globally in minutes. Timeline 2008: Satoshi Nakamoto publishes the Bitcoin whitepaper, “Bitcoin: A Peer-to-Peer Electronic Cash System”…
A blockchain is a distributed, immutable ledger that records transactions across a network of computers. Each participant maintains a complete copy of the ledger. Once data is written, it cannot be altered or deleted without the modification becoming immediately visible to the entire network. Unlike traditional databases managed by a single authority (a bank, corporation,…
std::any (C++17) is a type-safe container for single values of any type. It lets you store an int, string, custom struct, or vector in the same variable without losing type information—unlike void* pointers, which are inherently unsafe. How It Works std::any uses type erasure: it wraps whatever you give it, remembers the exact type, and…
Resource Acquisition Is Initialization (RAII) is a fundamental programming idiom in C++ that ties the lifecycle of a resource—memory, file handles, network sockets, database connections, locks—to the lifecycle of an object. When the object is created, the resource is acquired. When the object is destroyed and goes out of scope, the resource is automatically released….
RTTI is a C++ mechanism that allows you to determine an object’s type at runtime. It’s essential when working with polymorphism and inheritance hierarchies, but it comes with trade-offs you need to understand. Key RTTI Operators typeid() — Returns a std::type_info object representing the type. You can compare type information or get a human-readable name…
As C++ projects grow, understanding the web of dependencies between libraries and executables becomes critical for maintenance, build optimization, and architectural decisions. Graphviz provides a straightforward way to visualize your CMake build structure as a dependency graph. How It Works CMake can generate .dot files that describe relationships between targets (libraries, executables, and custom targets)….
In many Linux desktop environments (especially GNOME), the Super + . (Windows key + period) shortcut is used to open the Emoji picker. While useful for some, it can interfere with gaming, terminal workflows, or other custom keybindings. Disabling the Emoji Hotkey The cleanest approach is using gsettings, which manipulates the underlying dconf database without…
Unlike Python or JavaScript, C++ doesn’t provide a built-in split() method for strings. You’ll need to use library functions or write your own utility. The best approach depends on your compiler version, performance requirements, and whether you’re handling edge cases. The Classic Approach: find() and substr() The most straightforward method uses std::string::find() to locate delimiters…
Zlib is a critical compression library used across the Linux ecosystem. You’ll need it for compiling software from source, as it’s a dependency for git, libpng, openssl, and countless other tools. If you’ve hit a “zlib.h: No such file or directory” error during compilation, this is what you need. Quick Install sudo apt update sudo…