# validator

/ˈvælɪdeɪtər/ (US) · CEFR B2 · Noun

Source: https://englishreference.com/word/validator
Updated: 2026-07-19

## Definition

a person or a computer program that checks if something is correct or follows the rules. In cryptocurrency, a validator is a participant in a Proof of Stake network who verifies transactions and adds new blocks, earning staking rewards for helping secure the blockchain.

For teachers: a person or mechanism that verifies the accuracy, validity, or compliance of data, processes, or systems against a set of established criteria. In cryptocurrency, a validator stakes coins as collateral and is chosen to verify transactions and propose blocks in a Proof of Stake system.

## Examples

- The software includes a validator to check for errors in the code.
- Before submitting your application, use the online validator to ensure all required fields are filled out correctly.
- The security protocol employs a strict schema validator to reject any incoming packets that deviate from the predefined communication standards.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.