The Definitive Cryptocurrency
Encyclopedia & Forensic Reference

A blockchain is a continuously growing, append-only ledger of records — called blocks — that are cryptographically linked and secured across a distributed, peer-to-peer network. Each block contains a cryptographic hash of the preceding block, a timestamp, and transaction data, forming an immutable chain. The structure ensures that any retroactive alteration of a block invalidates all subsequent blocks, providing tamper-evidence without reliance on a central authority.

The Howey Test is a four-part legal standard established by the U.S. Supreme Court in SEC v. W.J. Howey Co., 328 U.S. 293 (1946), used to determine whether a transaction qualifies as an "investment contract" and therefore a security subject to federal regulation. Under the test, a transaction is a security if it involves: (1) an investment of money; (2) in a common enterprise; (3) with a reasonable expectation of profits; (4) derived from the efforts of others. The test has become the primary analytical framework applied by the SEC and federal courts to evaluate whether digital assets and token offerings constitute securities.

A smart contract is a self-executing program stored on a blockchain whose terms are directly written in code. Upon satisfaction of predefined conditions, the contract executes automatically without the need for intermediaries. The term was coined by legal scholar and cryptographer Nick Szabo in 1994, predating blockchain technology itself. In contemporary usage, smart contracts are most commonly deployed on the Ethereum Virtual Machine (EVM) and compatible networks.

Circulating supply refers to the total number of cryptocurrency tokens or coins that are publicly available and actively circulating in the market at a given point in time. It excludes tokens that are locked, reserved, vested, burned, or otherwise removed from active circulation. Circulating supply is the primary input used to calculate a cryptocurrency's market capitalization and serves as a key indicator of a token's liquidity profile and inflationary pressure.

Proof of Work is a consensus mechanism requiring network participants — known as miners — to expend computational effort to solve a cryptographic puzzle in order to propose and validate new blocks on a blockchain. The first miner to solve the puzzle broadcasts the solution to the network, earns the block reward, and appends the new block to the chain. The difficulty of the puzzle adjusts dynamically to maintain a consistent block production rate regardless of total network hash power.

A Decentralized Autonomous Organization (DAO) is an entity governed by rules encoded as smart contracts on a blockchain, in which decision-making authority is distributed among token holders rather than concentrated in a central management structure. Governance proposals are submitted on-chain, voted upon by token holders in proportion to their holdings, and — upon passage — executed automatically by the underlying smart contract infrastructure without requiring human intermediaries.