> ## Documentation Index
> Fetch the complete documentation index at: https://docs.theblockchainlibrary.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Weak Subjectivity

> A proof-of-stake concept where nodes joining after a long absence require a recent trusted checkpoint to avoid long-range attacks.

# Weak Subjectivity

A proof-of-stake concept where nodes joining after a long absence require a recent trusted checkpoint to avoid long-range attacks.

## Definition

A proof-of-stake concept where nodes joining after a long absence require a recent trusted checkpoint to avoid long-range attacks.

## Why it matters

Consensus concepts explain how independent nodes agree on one shared history without a central coordinator.

## Related knowledge

* [Block Producer](/generated/v2/glossary/block-producer) — term
* [Finality](/generated/v2/glossary/finality) — term
* [Proof of Stake](/generated/v2/books/proof-of-stake) — term
* [Validator](/generated/v2/glossary/validator) — term

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**Canonical knowledge ID:** `glossary:weak-subjectivity`