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  1. Home
  2. /Glossary
  3. /Double Spend
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blockchain

Double Spend

An attack where someone spends the same cryptocurrency twice.

Definition

An attack where someone spends the same cryptocurrency twice. Blockchain consensus mechanisms are specifically designed to prevent this. If you accept unconfirmed transactions, you're vulnerable to double-spend attacks.

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Related Terms

Consensus Mechanism

The method a blockchain uses to agree on which transactions are valid and in what order.

ABI

Application Binary Interface.

Account Abstraction

A way to make crypto wallets behave more like normal apps by turning every account into a smart contract.

ERC-4337

The Ethereum standard for account abstraction without changing the core protocol.

Account Model

The way Ethereum and many other chains track balances.

Actively Validated Service (AVS)

A service or protocol that uses EigenLayer's restaked ETH for its security instead of bootstrapping its own validator set.

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