Ethereum and EVM-based systems
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. Unlike a futures contract, where you’re locked in, an option lets you walk away if the trade goes against you. Your downside is capped at the premium you…
Cryptocurrency is a digital currency secured through cryptography and typically operating on decentralized blockchain networks. Unlike government-issued fiat currencies, cryptocurrencies derive their security and validation from distributed consensus mechanisms rather than central authorities. From Speculation to Real-World Infrastructure Early cryptocurrency adoption was primarily speculative. By 2026, the market has matured into genuine utility across multiple…
Double-spending is the fundamental vulnerability of digital currency: unlike physical cash, digital information can be copied. If you send me a digital file, I have it and you still have it. Money can’t work that way. Without a mechanism to prevent spending the same unit twice, the entire system collapses into worthlessness. Blockchains exist, at…
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…
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…
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…
Centralized exchanges operate like traditional financial intermediaries. You deposit cryptocurrency into a wallet controlled by the exchange, which maintains an internal ledger tracking balances and executing trades against its order book. The exchange acts as the counterparty to every transaction. Advantages: Order execution speed measured in milliseconds Fiat on/off ramps (USD, EUR, etc.) integrated with…