Allowlist

List of addresses granted early access or special mint/claim rights, often used in NFT launches.

Allowance (ERC‑20)

Permission that lets a contract spend a user’s tokens up to a set amount, approved via the ERC‑20 standard.

Algorithmic Stablecoin

Stablecoin that targets a peg using market incentives or supply rules instead of fully backed collateral. Risky during stress.

Air‑gapped Wallet

Wallet kept completely offline, signing transactions without a live network connection to reduce attack surface.

Airdrop Farming

Strategically using a protocol to maximize eligibility for future token airdrops, often with many wallets.

Admin Key

Privileged key that can upgrade or pause a protocol. Useful for safety, but adds centralization risk.

Address Poisoning

Scam where attackers send tiny transfers from look‑alike addresses to trick users into copying the wrong address.

Account Nonce

Counter stored with an account to prevent replay and enforce transaction ordering. Each new transaction increments the nonce.

Account Model

Ledger model where balances live in accounts and transactions update balances directly, contrasted with the UTXO model.

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