Definition ∞ Transaction modification refers to the unauthorized alteration of details within a digital transaction after its initiation but prior to its finalization on a blockchain. This could involve changing the recipient address, the amount of cryptocurrency transferred, or other critical parameters. While blockchain’s cryptographic security generally prevents post-confirmation modification, vulnerabilities in client-side software or network delays can expose transactions to this risk. Such changes can result in financial losses.
Context ∞ Transaction modification is a serious security concern in the cryptocurrency space, with news sometimes reporting on instances where vulnerabilities allow for such tampering. Front-running attacks, where malicious actors reorder or alter pending transactions for profit, represent a form of this risk in decentralized exchanges. The ongoing discussion emphasizes the need for robust transaction validation, secure software, and awareness of network congestion to prevent such malicious alterations.
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