Blockchain has developed its own rich vocabulary. From “address” to “zk‑rollup”, understanding these 100 terms will help you navigate crypto, DeFi, NFTs, and post‑quantum security. This glossary is curated for 2026 – includes classics, new trends (AI agents, DePIN, account abstraction), and quantum‑resistant concepts. Each term gets a crisp, no‑fluff definition.
A
Address – A string of characters (derived from a public key) that can receive cryptocurrency. Like an account number.
Agentic economy – An economic system where AI agents have crypto wallets and autonomously pay each other for services, data, or compute power.
AI agent – An autonomous program that uses a private key to sign transactions and interact with smart contracts or conditional transactions.
Algorithm identifier – A byte in Cellframe addresses or signatures that specifies which cryptographic algorithm is used. Enables upgrades without hard forks.
AMM (Automated Market Maker) – A DeFi protocol that uses a mathematical formula (e.g., x*y=k) to price assets instead of an order book.
API – Application Programming Interface; how different software applications talk to each other. In blockchain, often used to query node data.
Atomic swap – A trustless, peer‑to‑peer exchange of cryptocurrencies across different blockchains without a central exchange.
Attack vector – Any method an attacker can use to compromise a system. For blockchains: 51% attacks, phishing, Sybil attacks, etc.
Attestation – In PoS (Ethereum, Cellframe), a validator’s vote confirming that a block is valid.
Avalanche consensus – A family of consensus protocols that use repeated random sampling to achieve finality in seconds.
B
BFT (Byzantine Fault Tolerance) – A property of a distributed system to function correctly even if some nodes act maliciously or fail.
BIP (Bitcoin Improvement Proposal) – A design document for Bitcoin. BIP‑360 and BIP‑361 address quantum resistance.
Bitcoin (BTC) – The first cryptocurrency, launched in 2009. Uses Proof‑of‑Work and secp256k1 elliptic curve (vulnerable to quantum attack).
Block – A container of transactions, timestamp, and the hash of the previous block. The building block of a blockchain.
Blockchain – A distributed, immutable ledger made of linked blocks. No central authority.
Block reward – Newly minted coins given to a miner (PoW) or validator (PoS) for adding a block.
Bridge – A protocol that transfers assets or data between two independent blockchains. Often a weak point for hacks.
Bytecode – Low‑level code executed by a virtual machine (e.g., EVM bytecode for Ethereum smart contracts).
C
Casper – Ethereum’s PoS finality gadget. Combines with LMD‑GHOST for fork choice.
Cell – In Cellframe, the smallest scalable unit – a lightweight blockchain within an L1 parachain. Cells can fork automatically under load.
CF‑20 – Cellframe’s fungible token standard (post‑quantum, similar to ERC‑20).
CF‑721 – Cellframe’s NFT standard (post‑quantum, similar to ERC‑721).
Coin – A cryptocurrency that has its own native blockchain (e.g., BTC, ETH, CELL). Contrast with token.
Conditional transaction – Cellframe’s built‑in mechanism that releases locked funds only when a predefined condition is met. No smart contract code.
Consensus – The process by which blockchain nodes agree on the state of the ledger.
CRQC (Cryptographically Relevant Quantum Computer) – A quantum computer powerful enough to break RSA or ECDSA. Estimates: 2029‑2032.
CRYSTALS‑Dilithium (ML‑DSA) – NIST‑approved lattice‑based post‑quantum signature scheme. Used in Cellframe.
Custodial wallet – A wallet where a third party (exchange) controls the private keys. “Not your keys, not your coins.”
D
DAO (Decentralized Autonomous Organization) – An organisation governed by smart contracts and token‑holder voting. No CEO.
Data availability – The guarantee that block data is published and accessible to all nodes. Critical for rollups and light clients.
dApp – Decentralised application that runs on a blockchain (smart contracts on L1, or t‑dApps on Cellframe).
DeFi (Decentralized Finance) – Financial services (lending, trading, insurance) built on blockchains without banks.
Delegation – In PoS, token holders can assign their staking rights to a validator without transferring ownership.
DePIN (Decentralized Physical Infrastructure Networks) – Networks where users contribute physical hardware (hotspots, sensors, cameras) and earn tokens.
DEX (Decentralized Exchange) – A peer‑to‑peer marketplace for crypto assets, no central custodian.
Double‑spend – Spending the same digital asset twice. Blockchain prevents this by waiting for confirmations.
DUNA Act – Alabama law (April 2026) giving DAOs legal status as Decentralized Unincorporated Nonprofit Associations.
E
ECDSA (Elliptic Curve Digital Signature Algorithm) – The signature algorithm used by Bitcoin and Ethereum. Vulnerable to Shor’s algorithm.
EEA (Enterprise Ethereum Alliance) – A group of companies that collaborate on Ethereum‑based business solutions.
Encryption – Converting information into a secret code. Blockchain uses asymmetric encryption (public/private keys).
Entanglement (quantum) – A quantum phenomenon where qubits become correlated; measuring one instantaneously affects the other, regardless of distance.
ERC‑20 – The most common standard for fungible tokens on Ethereum.
ERC‑721 – The standard for non‑fungible tokens (NFTs) on Ethereum.
ERC‑1155 – A multi‑token standard (both fungible and non‑fungible) for efficiency.
Escrow – A third‑party arrangement where funds are held until contract conditions are met. In blockchain, done via smart contracts or conditional transactions.
ESBOCS – Cellframe’s modified PoS consensus, optimised for post‑quantum cryptography and small validator committees.
Ethereum (ETH) – The second‑largest blockchain, supporting smart contracts. Transitioned to PoS in 2022 (“The Merge”).
EVM (Ethereum Virtual Machine) – The runtime environment for smart contracts on Ethereum.
F
Falcon (FN‑DSA) – A compact lattice‑based post‑quantum signature scheme. Expected NIST FIPS 206. Used in Cellframe for transactions.
Faucet – A website or app that gives out small amounts of crypto for free, often for testnets.
Fiat – Government‑issued currency (USD, EUR, RUB). Cryptocurrencies are often traded against fiat.
Finality – The point at which a transaction cannot be reversed or changed. In PoS, often after >2/3 votes.
FIPS (Federal Information Processing Standards) – US government standards for cryptography. FIPS 203‑205 are NIST post‑quantum standards.
Fork – A split of a blockchain into two chains. Hard fork = incompatible change; soft fork = backward‑compatible.
Full node – A node that stores the entire blockchain and verifies all transactions independently.
G
Gas – A fee paid to process transactions on Ethereum. Measured in gwei (1e‑9 ETH).
Genesis block – The very first block of a blockchain (block #0).
Governance token – A token that gives holders voting rights in a DAO or protocol (UNI, AAVE, MKR).
Gwei – Smallest commonly used unit of ETH (1 Gwei = 10⁻⁹ ETH). Used to express gas prices.
H
Hard fork – A permanent divergence from the previous version of a blockchain. Requires all nodes to upgrade.
Harvest now, decrypt later (HNDL) – Strategy of collecting encrypted data (e.g., public keys) now to decrypt after a quantum computer exists.
Hash – The output of a cryptographic hash function (SHA‑256, Keccak‑256). One‑way, deterministic, collision‑resistant.
Hashrate – The total computational power used by PoW miners to secure the network.
HD wallet (Hierarchical Deterministic) – A wallet that generates a tree of keys from a single seed phrase.
HTLC (Hashed Timelock Contract) – A smart contract construct used in atomic swaps and payment channels.
I
Immutable – Unchangeable. Once a transaction is recorded and finalised, it cannot be altered.
Interoperability – The ability of different blockchains to exchange data and assets (e.g., via bridges or L0 protocols).
IPFS (InterPlanetary File System) – A decentralised file storage system often used alongside blockchain for off‑chain data.
IOTA – A distributed ledger designed for IoT, using a directed acyclic graph (DAG) instead of a blockchain.
J–K
- Kyber (CRYSTALS‑Kyber, ML‑KEM) – NIST‑standard post‑quantum key encapsulation mechanism (FIPS 203). Used in Cellframe for secure channels.
L
L0 (Layer 0) – Foundational infrastructure connecting multiple blockchains. Examples: Polkadot, Cosmos, Cellframe.
L1 (Layer 1) – Base blockchain (Bitcoin, Ethereum, Cellframe parachains). Provides consensus and settlement.
L2 (Layer 2) – Scaling solution built on top of L1 (rollups, payment channels). Transactions are cheaper and faster.
Lattice (cryptography) – Mathematical structure used in post‑quantum algorithms. Problems like LWE are believed quantum‑hard.
Light node (SPV) – A node that stores only block headers and relies on full nodes for transaction data. Suitable for mobile wallets.
Liquidity pool – A collection of funds locked in a smart contract to facilitate trading on a DEX.
Logical qubit – A qubit built from many physical qubits using error correction. Estimates for breaking ECDSA: ~1,200‑1,450.
LWE (Learning With Errors) – A hard mathematical problem underpinning many lattice‑based PQC schemes (Dilithium, Kyber).
M
Masternode – A full node with additional responsibilities (e.g., instant transactions, governance). In Cellframe, a validator node.
mCELL – Cellframe staking token. Received by staking 10,000 CELL; grants the right to run a master node.
Mempool – The waiting area for unconfirmed transactions before they are included in a block.
Merkle tree – A binary tree of hashes that allows efficient verification of transaction inclusion without downloading the whole block.
Mining – The process of creating new blocks in PoW by solving cryptographic puzzles.
Multisig (Multi‑signature) – An address or wallet that requires multiple private keys to authorise a transaction (e.g., 2 of 3).
N
NFT (Non‑Fungible Token) – A unique token with a distinct identifier, proving ownership of a specific digital or physical item.
NIST (National Institute of Standards and Technology) – US federal agency that standardises cryptographic algorithms, including post‑quantum cryptography.
Node – Any computer running blockchain software that participates in the network.
Nonce (cryptographic) – An arbitrary number used once in a cryptographic communication. In PoW, miners iterate nonce to find a valid hash.
Nonce (transaction) – A counter in an Ethereum account to prevent replay attacks.
O–P
Oracle – A service that brings off‑chain data (prices, weather, sports results) onto the blockchain.
P2PK (Pay‑to‑Public‑Key) – Legacy Bitcoin address format where the public key is permanently visible on‑chain. Satoshi’s coins are on such addresses (~1.7M BTC).
P2PKH (Pay‑to‑Public‑Key‑Hash) – Bitcoin address format that hides the public key behind a hash. Safer against quantum at‑rest attacks.
P2TR (Pay‑to‑Taproot) – Bitcoin’s Taproot address format, which by default exposes public keys – widening quantum attack surface.
Payment channel – A two‑party mechanism for unlimited off‑chain transactions, settled on‑chain (e.g., Lightning Network).
Physical qubit – A real‑world qubit implemented in hardware (superconducting, trapped ion, neutral atom). Many physical qubits form one logical qubit.
PoS (Proof‑of‑Stake) – Consensus where validators stake their own coins to participate. Energy‑efficient.
PoW (Proof‑of‑Work) – Consensus requiring computational work (mining). Secure but energy‑intensive.
Post‑quantum cryptography (PQC) – Algorithms designed to be secure against both classical and quantum computers.
Private key – A secret number that allows spending funds from a specific address. Never share it.
Public key – Derived from the private key; shared openly to receive funds or verify signatures.
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