# Validator

## Overview

FON Smart Chain is an innovative solution, FON Smart Chain relies on a system of 99 validators with Proof of Stake (APoS) consensus that supports short block times and low fees. The validator candidate with the most stake will become a validator and produce blocks. Double-signature detection and other slashing logic guarantee security, stability, and chain finality.

In addition to the 21 active verifiers, FSC will also introduce more verifiers, for example, more than 21 inactive verifiers will be added to the verifier set as backups, and these verifiers will be called "candidates".

Unavailable candidates will also be cut, but on a smaller scale. Good incentives are expected to remain so that candidate validators are willing to ensure quality and help secure FSC.

In the extreme case, if a majority of the 21 active validators are attacked and go offline, validator candidates can report stale blockages to the beacon chain, restore it and eventually propose to re-elect the active validator set.

### What is a validator? <a href="#what-is-validator" id="what-is-validator"></a>

FON Smart Chain relies on a set of validators who are responsible for submitting new blocks in the blockchain. These validators participate in the consensus protocol by signing blocks containing cryptographic signatures signed by each validator's private key. The validator set is determined by the pledge module built on the FON smart chain, and the election rankings are refreshed every 3 hours to elect 21 valid validators.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.fonscan.io/develop/validator.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.