Bitcoin Terms
A Guide to Bitcoin Terminology
This dictionary provides simple explanations of common Bitcoin and cryptocurrency terms. Whether you're new to the space or looking to refresh your knowledge, this resource will help you navigate the complex world of digital assets.
| Term | Definition |
|---|---|
| A | |
| Address | A string of alphanumeric characters used to send and receive Bitcoin, similar to an email address but for cryptocurrency. Example: 1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa (the first Bitcoin address ever created). |
| ASIC | Application-Specific Integrated Circuit. Specialized hardware designed specifically for Bitcoin mining, much more efficient than general-purpose computers. |
| ATH | All-Time High. The highest price that Bitcoin (or any asset) has ever reached. |
| B | |
| Block | A collection of transactions that are bundled together and added to the blockchain. Each block contains a reference to the previous block, creating a chain. |
| Block Reward | The new bitcoins issued to miners who successfully mine a block. The reward halves approximately every four years in an event known as the "halving." |
| Blockchain | A digital ledger that records all Bitcoin transactions. It's distributed across a network of computers and is designed to be immutable and transparent. |
| BTC | The ticker symbol for Bitcoin, similar to how USD represents US Dollar. |
| Bull/Bear Market | A bull market refers to a period of rising prices and optimism, while a bear market refers to a period of falling prices and pessimism. |
| C | |
| Cold Storage | Keeping Bitcoin offline in a device not connected to the internet to protect it from hacking. Examples include hardware wallets and paper wallets. |
| Confirmation | When a transaction is included in a block and added to the blockchain, it receives one confirmation. Each subsequent block adds another confirmation, making the transaction more secure. |
| Consensus | The mechanism by which all nodes in the Bitcoin network agree on the state of the blockchain. Bitcoin uses a consensus algorithm called "Proof of Work." |
| Cryptocurrency | A digital or virtual currency that uses cryptography for security and operates on a decentralized network (typically a blockchain). Bitcoin was the first cryptocurrency, but there are now thousands of others with various features and purposes. |
| Custodial | When a third party (like an exchange) holds your Bitcoin for you, as opposed to "non-custodial" where you control your own private keys. |
| D | |
| DCA (Dollar-Cost Averaging) | An investment strategy of buying a fixed dollar amount of Bitcoin at regular intervals (weekly, monthly) regardless of price. Reduces the impact of volatility by spreading purchases over time. Widely recommended for long-term Bitcoin accumulation. |
| DYOR | "Do Your Own Research." A common phrase in the cryptocurrency community encouraging people to investigate before investing. |
| Difficulty | A measure of how hard it is to mine a Bitcoin block. The difficulty adjusts approximately every two weeks to maintain a consistent block time of about 10 minutes. |
| Decentralization | The distribution of power away from a central authority. Bitcoin is decentralized because no single entity controls the network. |
| E | |
| Exchange | A platform where you can buy, sell, and trade cryptocurrencies. Exchanges can be centralized (controlled by a company) or decentralized ("DEX", running on smart contracts). |
| F | |
| FOMO | "Fear Of Missing Out." The anxiety that drives people to buy Bitcoin when prices are rising rapidly, often leading to buying at peak prices. |
| FUD | Fear, Uncertainty, and Doubt. Often refers to negative information spread with the intention of manipulating people's opinions about Bitcoin. |
| Fungible | The property of an asset where all units are identical and interchangeable. One bitcoin is equal to another bitcoin, making it fungible like traditional currency. |
| G | |
| Genesis Block | The very first block ever mined on the Bitcoin blockchain, mined by Satoshi Nakamoto on January 3, 2009. It contains the famous message: "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks." The 50 BTC reward from the Genesis Block can never be spent. |
| GBTC | Grayscale Bitcoin Trust. The first publicly traded Bitcoin investment vehicle in the US, launched in 2013. Converted to a spot ETF in January 2024. Historically traded at a significant premium or discount to Bitcoin's net asset value. |
| H | |
| Halving | An event that occurs approximately every four years where the block reward for miners is cut in half. This reduces the rate at which new bitcoins are created, enforcing Bitcoin's scarcity. |
| Hash Rate | The total computational power being used to mine Bitcoin and process transactions. Higher hash rates mean more security for the network. |
| HODL | A deliberate misspelling of "hold" that became a popular term for keeping your Bitcoin long-term instead of selling, regardless of price volatility. Often humorously backronymed as "Hold On for Dear Life". |
| I | |
| IBIT | The ticker symbol for BlackRock's iShares Bitcoin Trust ETF, the largest Bitcoin ETF by assets under management. Launched in January 2024, IBIT allows traditional investors to gain Bitcoin exposure through a standard brokerage account. |
| ILIT | Irrevocable Life Insurance Trust. A trust that owns a life insurance policy outside your taxable estate. The death benefit passes to heirs without estate tax, providing liquidity to cover estate taxes on appreciated assets like Bitcoin. |
| L | |
| Lightning Network | A "layer 2" payment protocol built on top of Bitcoin that enables faster and cheaper transactions by processing them off the main blockchain. |
| LTV (Loan-to-Value) | Loan-to-Value ratio. The percentage of a loan relative to the collateral value. In Bitcoin-backed lending, a conservative LTV of 25–30% means a 70%+ Bitcoin price drop is needed before a margin call. Higher LTV = more cash borrowed but less buffer against price drops. |
| M | |
| Mining | The process of validating transactions and adding them to the blockchain. Miners use powerful computers to solve complex mathematical problems, and are rewarded with newly created bitcoins. |
| Model | A mathematical or conceptual representation used to predict Bitcoin's price or behavior. Common models include the Saylor Model and Power Law Model. |
| Multisig | Short for "multi-signature," a security feature that requires multiple private keys to authorize a Bitcoin transaction, rather than just one. |
| N | |
| Node | A computer that connects to the Bitcoin network and helps validate transactions. Full nodes maintain a complete copy of the blockchain. |
| Non-custodial | When you have full control of your Bitcoin private keys, rather than trusting a third party to hold them for you. "Not your keys, not your coins" is a common saying. |
| O | |
| On-chain | Transactions or data that are recorded directly on the Bitcoin blockchain. On-chain transactions are permanent and verifiable by anyone, but require miners to confirm them. Contrast with off-chain or Lightning Network payments. |
| Ordinals | A system launched in 2023 that allows data — images, text, video — to be inscribed on individual satoshis on the Bitcoin blockchain. Ordinals created Bitcoin's first NFT-like assets and introduced the concept of Bitcoin-native digital collectibles. |
| P | |
| Power Law Model | A mathematical model that suggests Bitcoin's price follows a power law relationship over time, where price increases at a decreasing rate. This model uses logarithmic regression to predict future Bitcoin prices based on historical patterns. |
| Private Key | A secret number that allows bitcoins to be spent. Anyone with access to a private key can control the associated bitcoins, which is why security is so important. |
| Public Key | Derived from the private key, the public key is used to create a Bitcoin address where others can send funds. |
| Proof of Work (PoW) | The consensus algorithm used by Bitcoin. Miners compete to solve complex mathematical puzzles, with the winner getting to add the next block to the blockchain and receive the block reward. |
| R | |
| Roth IRA | An individual retirement account where contributions are after-tax. All growth and qualified withdrawals are completely tax-free. Contributing Bitcoin or Bitcoin ETF shares to a Roth IRA at a young age can produce millions in tax-free wealth at retirement. |
| S | |
| Satoshi | The smallest unit of Bitcoin, equal to 0.00000001 BTC (one hundred millionth of a bitcoin). Named after Bitcoin's creator, Satoshi Nakamoto. |
| Satoshi Nakamoto | The pseudonymous person or group who created Bitcoin and published the Bitcoin whitepaper in 2008. Their true identity remains unknown. |
| Saylor Model | A Bitcoin valuation model proposed by MicroStrategy CEO Michael Saylor that suggests Bitcoin's value is derived from its role as digital property and monetary energy. The model compares Bitcoin to other store-of-value assets and predicts significant long-term price appreciation. |
| Seed Phrase | A series of words (usually 12 or 24) that can be used to recover a Bitcoin wallet if the device is lost or damaged. Also called a recovery phrase or mnemonic. |
| Stepped-Up Basis | A tax rule (IRC §1014) that resets an inherited asset's cost basis to its fair market value on the date of the owner's death. Heirs who inherit Bitcoin pay capital gains only on post-inheritance appreciation — lifetime gains are never taxed. This is a central benefit of the buy-borrow-die estate strategy. |
| Stock-to-Flow | A scarcity model comparing total existing supply (stock) to annual new production (flow). Gold has a stock-to-flow ratio of ~60; after the 2024 halving, Bitcoin's is ~120 — making it mathematically twice as scarce as gold by this measure. Created by analyst PlanB. |
| T | |
| Tax Loss Harvesting | Selling a depreciated Bitcoin position to realize a capital loss that offsets gains elsewhere. Because the IRS wash-sale rule does not apply to cryptocurrency, you can immediately repurchase Bitcoin after selling — locking in the tax loss without losing exposure. |
| Treasury Reserve (Bitcoin) | A corporate strategy of holding Bitcoin as a primary treasury asset. Pioneered by Michael Saylor's Strategy (formerly MicroStrategy) in 2020 as a hedge against dollar debasement. As of 2026, Strategy holds over 500,000 BTC. |
| U | |
| UTXO | Unspent Transaction Output. The fundamental accounting unit of Bitcoin. Rather than account balances, Bitcoin tracks UTXOs — individual chunks of BTC that have been received but not yet spent. Your wallet balance is the sum of all UTXOs associated with your addresses. |
| UTMA | Uniform Transfers to Minors Act. A custodial account opened by a parent (or grandparent) in a child's name. Assets legally belong to the child and transfer to their direct control at age 18–21 depending on state law. Can hold Bitcoin or Bitcoin ETF shares as a generational wealth vehicle. |
| V | |
| Volatility | The degree to which an asset's price fluctuates over time. Bitcoin is considered a high-volatility asset — annual price swings of 50-80% are common. Long-term holders view volatility as a feature (opportunity to accumulate) rather than a bug. |
| Vaulting | The practice of securing large Bitcoin holdings in offline cold storage, often with time-locked or multisig protections, making it difficult or impossible to quickly liquidate — a strategy used by long-term institutional holders. |
| W | |
| Wallet | Software or hardware that stores your private keys and allows you to interact with the Bitcoin blockchain to send and receive funds. |
| Whale | An individual or entity that holds a large amount of Bitcoin, enough to potentially influence market prices when they buy or sell. |
| Whitepaper | The original document published by Satoshi Nakamoto in 2008 that outlined the principles and technical details of Bitcoin. |
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